A method and system for controlling air cooling in multi-aggregate precooling

Abstract

This application relates to the field of intelligent manufacturing control technology, specifically to a method and system for air-cooling control of multi-aggregate pre-cooling. The proposed solution classifies and silosizes aggregates according to their different particle sizes and pre-cooling characteristics, allowing for targeted and individual pre-cooling. This results in good cooling effect, saves pre-cooling time, and improves work efficiency. Furthermore, through periodic dynamic pre-cooling control and adjustment, combined with real-time monitoring of aggregate temperature in each silo, the required cooling capacity is dynamically calculated and allocated to air cooling, ensuring the synchronization of the cooling process for each aggregate. This allows pre-cooled aggregates of different particle sizes and characteristics to simultaneously reach the preset discharge temperature within the target time. Simultaneously, the proposed solution exhibits good robustness to disturbances such as initial aggregate temperature fluctuations, ambient temperature changes, and silo level variations, automatically adjusting the allocation strategy to maintain stable pre-cooling effects.

Description

Technical Field

[0001] This application relates to the field of intelligent manufacturing control technology, specifically to a method and system for air-cooling control of multi-aggregate pre-cooling. Background Technology

[0002] During the concrete production process, especially in the construction of large-volume concrete (such as dams, bridge piers, and large foundations) and in high-temperature environments, it is necessary to pre-cool the concrete aggregate to control the concrete discharge temperature and pouring temperature, thereby ensuring the quality of the project.

[0003] Existing precooling methods mainly include air cooling and spraying. However, in traditional air cooling designs, different aggregates (large stones and small stones) are often precooled uniformly for a certain period of time based on experience. However, the physical properties of large and small stone aggregates of different particle sizes differ significantly: small stones have small gaps, high air resistance, relatively high moisture content, slow cooling speed, and are prone to "frozen storage" phenomenon; while large stones have high porosity, strong cold air penetration, low resistance, and fast cooling speed. Furthermore, the thermophysical properties (such as specific heat capacity) and heat exchange efficiency with cold air of aggregates of different particle sizes differ significantly. Therefore, traditional air cooling designs cannot well adapt to the characteristics of different aggregates.

[0004] Furthermore, traditional control methods often rely on supplying cold air at a certain temperature and volume, and pre-cooling based on experience or simple controls. This approach not only fails to respond to the dynamic changes in the real-time temperature and cooling process of the aggregates, but also easily leads to asynchronous cooling of different aggregates: if the slower-cooling smaller stones are used as the benchmark, the larger stones may have already overcooled, resulting in energy waste; if the larger stones are used as the benchmark, the smaller stones may not have cooled sufficiently, becoming a "weak link" in concrete temperature control. Therefore, existing cooling control methods struggle to accurately supply cooling based on actual load, often resulting in wasted cooling capacity, high system energy consumption, and difficulty in ensuring the uniformity of aggregate cooling. Summary of the Invention

[0005] Based on this, this application proposes a multi-aggregate pre-cooling air-cooling control method and system to address the above problems. The aim is to combine the characteristics of different aggregates to intelligently and accurately control the pre-cooling of air-cooled aggregates, ensuring the synchronicity and uniformity of the aggregate cooling process, thereby laying the foundation for the preparation of high-quality concrete.

[0006] This application provides a method for controlling air cooling in multi-aggregate precooling, applied to a multi-aggregate precooling system, the method comprising:

[0007] Based on the characteristics of each aggregate, control the input of different aggregate bins into the corresponding air-cooled aggregate bins;

[0008] The precooling time of each air-cooled aggregate is divided into multiple control cycles;

[0009] Collect the temperature of each air-cooled aggregate in the current cycle, and based on the temperature of each air-cooled aggregate and the corresponding target discharge temperature, determine the air supply parameters per unit time for each air-cooled aggregate bin in the current cycle.

[0010] Based on the current air supply parameters, control the duration of the pre-cooling cycle for each air-cooled aggregate bin, and then cycle to the next control cycle until each air-cooled aggregate reaches the target outlet temperature.

[0011] Determine the demand for each air-cooled aggregate based on the current concrete mix proportion, control the opening and closing of the corresponding air-cooled aggregate bin valves, and weigh the cooled air-cooled aggregate.

[0012] Furthermore, the method also includes:

[0013] The remaining precooling time is determined based on the precooling time of each air-cooled aggregate;

[0014] Based on the current temperature of each air-cooled aggregate, the corresponding target discharge temperature, and the remaining pre-cooling time, determine the cooling capacity Q required per unit time for each air-cooled aggregate bin in the current cycle. i ;

[0015] Based on the required cooling capacity Q per unit time i Determine the air supply volume W per unit time. i and wind speed v i :

[0016] ,

[0017] Where, p i max For the maximum air supply of the i-th air-cooled aggregate silo, γ a For the density of the cooling air, I i o I i in The enthalpy of the air outlet and inlet of the i-th pre-cooled air-cooled aggregate silo, F, are respectively. i Let be the effective air-cooled circulation area of ​​the i-th air-cooled aggregate bin.

[0018] Preferably, the required air cooling capacity Q per unit time for each air-cooled aggregate bin in the current cycle is... i satisfy:

[0019]

[0020] Where, m i For the current air-cooled aggregate bin i, the required quality of air-cooled aggregate is c. i To correspond to the specific heat capacity of the i-th air-cooled aggregate, T 1i T 2i η represents the current average temperature and target discharge temperature of the i-th air-cooled aggregate, respectively. iFor the current heat exchange efficiency of the i-th air-cooled aggregate, t s This represents the current remaining precooling time for the air-cooled aggregate.

[0021] Furthermore, the method also includes:

[0022] Determine whether the total air supply of each air-cooled aggregate bin is greater than the maximum air supply of the refrigeration unit.

[0023] If not, then control the air supply to each air-cooled aggregate bin according to the current air volume and speed for the current cycle duration of pre-cooling;

[0024] If so, control the refrigeration unit to supply air at the maximum air volume, and adjust the current air volume and wind speed of each air-cooled aggregate according to the maximum air volume.

[0025] Furthermore, adjusting the current air supply volume of each air-cooled aggregate according to the maximum air supply volume also includes:

[0026] Calculate the temperature difference ΔT between the current and target outlet temperatures of each air-cooled aggregate bin. i ;

[0027] Based on the current temperature difference and corresponding heat exchange efficiency of each air-cooled aggregate bin, determine the air supply allocation weight of each air-cooled aggregate bin.

[0028] The current air supply and velocity of each air-cooled aggregate are adjusted based on the maximum air supply and each weight.

[0029] Furthermore, each air-cooled aggregate bin is equipped with a weighing hopper at its bottom, and the weighing hopper contains a load cell for weighing the cooled air-cooled aggregate, including:

[0030] Based on the current concrete mix design requirements, determine the target weight and number of weighings for each air-cooled aggregate in a single weighing.

[0031] Control the opening of the bottom valves of each air-cooled aggregate bin to allow the cooled air-cooled aggregate to fall from the air-cooled aggregate bin into the weighing hopper;

[0032] If the weight of the air-cooled aggregate measured by the weighing hopper reaches a preset proportion of the single target weight, the valve at the bottom of the corresponding air-cooled aggregate bin will be closed.

[0033] The system continuously compares the current weight of the air-cooled aggregate with the target weight for a single operation. If the current weight of the aggregate is insufficient, the valve is briefly opened again to perform a jog-style fine-tuning and replenishment until the current weight reaches the target weight for a single operation.

[0034] Proceed to the next weighing cycle until all air-cooled aggregate bins have been weighed.

[0035] A second aspect of this application provides an air-cooled system for pre-cooling multiple aggregates, the system comprising:

[0036] An aggregate pre-cooling silo includes multiple air-cooled aggregate bins, wherein an air window is provided on one side of each air-cooled aggregate bin, and the air window is connected to a refrigeration unit through an air duct;

[0037] Refrigeration unit, used to generate air-cooled cold source according to instructions and supply it to the corresponding air-cooled aggregate bin;

[0038] The air-cooled control subsystem is used to acquire temperature information of each air-cooled aggregate bin and generate control commands to execute the steps described in any of the above methods.

[0039] Furthermore, the air window includes an air inlet window and an air outlet window, with the air inlet window located at the lower part of the air-cooled aggregate bin;

[0040] The air-cooled aggregate bin is equipped with an air chamber connected to the corresponding air inlet window. The air chamber is equipped with a regulating valve and a fan at the connection point with the air inlet window to regulate the air supply volume and / or wind speed.

[0041] The bottom of the air-cooled aggregate bin is equipped with a weighing hopper, and a valve is installed at the junction of the bottom of the air-cooled aggregate bin and the top of the weighing hopper.

[0042] A third aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, causes the processor to perform the steps of any of the methods described above.

[0043] A fourth aspect of this application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor performs the steps of any of the methods described above.

[0044] The solution provided in this application classifies and silos different aggregate sizes and precooling characteristics for targeted individual precooling and cooling, resulting in good cooling effect, saving precooling time, and improving work efficiency. Furthermore, through periodic dynamic precooling control and adjustment, combined with real-time monitoring of the aggregate temperature in each silo, the required cooling capacity is dynamically calculated and allocated to air cooling, ensuring the synchronization of the cooling process of each aggregate and enabling precooled aggregates of different sizes and characteristics to simultaneously reach the preset outlet temperature within the target time.

[0045] Furthermore, this application's solution also assigns corresponding weights based on the current precooling status of each aggregate bin, prioritizing the allocation of cooling capacity to bins with more urgent needs or lower heat exchange efficiency. This significantly improves the effective utilization rate of cooling capacity, substantially reduces system operating energy consumption, and enhances the overall precooling efficiency of the system. Simultaneously, this application's solution exhibits good robustness to disturbances such as initial aggregate temperature fluctuations, ambient temperature changes, and bin height variations, enabling adjustments to the allocation strategy to maintain stable precooling effects. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] in:

[0048] Figure 1 This is a flowchart of an air-cooling control method for multi-aggregate precooling in one embodiment;

[0049] Figure 2 This is a schematic diagram of a multi-aggregate precooling air-cooling system in one embodiment;

[0050] Figure 3 This is a full-scale structural schematic diagram of an air-cooling system for pre-cooling multiple air-cooled aggregates in one embodiment;

[0051] Figure 4 This is a structural block diagram of a computer device in one embodiment; Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0053] The terms "comprising," "including," and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such processes, methods, products, or apparatus. Terms such as "first" and "second," and other relational terms, in the claims, specification, and accompanying drawings of this application, are used merely to distinguish one entity / operation / object from another, and do not necessarily require or imply any such actual relationship or order between these entities / operations / objects.

[0054] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase at various points in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0055] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0056] In one implementation, such as Figure 1 The diagram shown is a flowchart of a multi-aggregate precooling air-cooling control method according to this application. The method is applied to a multi-aggregate precooling system, which can simultaneously precool multiple different aggregates. The system includes an aggregate precooling silo, internally divided into multiple aggregate bins, each containing multiple air-cooled aggregate bins. The method includes:

[0057] S100. Based on the characteristics of each aggregate, control the input of different aggregate bins into the corresponding air-cooled aggregate bins.

[0058] Specifically, this application designs different cooling environments for different aggregates (such as specific heat capacity) and fluid resistance characteristics (porosity, particle size) based on their thermal properties (such as specific heat capacity) and fluid resistance characteristics (porosity, particle size), and performs compartmentalized pre-cooling to achieve refined cooling. Among them, particles with a diameter of 5-10mm are classified as small aggregates, and particles with a diameter greater than 10mm are classified as medium and large aggregates.

[0059] Furthermore, in one embodiment, the present application also includes an integrated aggregate conveying subsystem for conveying corresponding air-cooled aggregates to corresponding air-cooled aggregate bins for replenishment. The aggregate conveying subsystem includes a conveying system and a movable distribution hopper to accurately deliver air-cooled aggregates into designated air-cooled aggregate bins, achieving automated feeding and dispensing. Furthermore, the conveying subsystem can communicate with the control system via wired or wireless communication to receive control commands and execute actions to feed different aggregates into different aggregate bins.

[0060] According to the type of aggregate that needs to be fed, the control system instructs the movable feeder to move to the upper part of the corresponding aggregate bin receiving port and align it. After confirming that the feeder is connected to the designated cooling bin receiving port, the control system controls the corresponding aggregate bin receiving air valve (sealing cover) to open to receive the material. After the material is unloaded, the control system controls the corresponding receiving air valve to close to ensure that the bin is sealed.

[0061] S101. Divide the precooling time of each air-cooled aggregate into multiple control cycles.

[0062] Specifically, the total precooling time is divided into a series of continuous control cycles. Within each cycle, the cooling capacity is dynamically calculated and allocated based on the real-time temperature status of each aggregate (large stone and small stone) bin to ensure that both reach the set temperature within the target time. For example, if the precooling time for each aggregate is set to 10 hours according to the project and construction schedule and requirements, the system uses a fixed time interval (e.g., 5-10 minutes) as a control cycle. Alternatively, based on the rate of change of aggregate temperature throughout the precooling process, the precooling can be divided into three main stages: initial stage (e.g., the first 20%-30% of the precooling time, when the temperature difference between the aggregate and the cold air is the largest, heat exchange is intense, and the cooling rate is fast), middle stage (e.g., the middle 50%-70% of the precooling time, when the cooling rate changes from high speed to stable), and final stage (e.g., the last 10%-20% of the precooling time, when the target temperature is approached, the cooling rate slows down, and the internal and external temperatures of the aggregate tend to be uniform). Different time intervals are set as control cycles for the specific precooling of each of the three stages, such as initial stage cycle < middle stage cycle < final stage cycle.

[0063] Within each cycle, the system executes a complete process of "data acquisition, air volume calculation, air volume distribution, and execution adjustment". It then continuously changes the adjustment strategy based on the rate of heat exchange between the aggregate and the cold air and the evolution characteristics of the internal temperature field of the aggregate, so as to achieve precise synchronous temperature control and high-efficiency energy saving.

[0064] S102. Collect the temperature of each air-cooled aggregate in the current cycle, and determine the air supply parameters per unit time for each air-cooled aggregate bin based on the temperature of each air-cooled aggregate and the corresponding target discharge temperature.

[0065] Specifically, multiple air-cooled aggregate bins (e.g., large and small stone bins) share a cooling system. This application's solution is based on real-time monitoring of the current and target temperatures of each air-cooled aggregate bin, and performs multi-variable, adaptive airflow distribution control. The goal is to dynamically allocate the airflow and corresponding wind speed for the current cycle based on the current temperature and target outlet temperature of the aggregate in each bin, enabling the aggregate in each bin to cool to the target temperature within the expected time, thereby achieving efficient and coordinated cooling. Specifically, this includes:

[0066] S1021. Determine the current remaining precooling time based on the precooling time of each air-cooled aggregate.

[0067] Specifically, this application's solution is based on time-synchronized cooling for control and adjustment. That is, given the total available pre-cooling time (determined by the production needs of the mixing plant), the airflow distribution between the large and small stone silos is dynamically adjusted to ensure that each aggregate completes cooling within the expected time, reaching its target temperature, thereby maximizing system and engineering efficiency. Therefore, the core of this application's control is no longer simply allocating cooling capacity based on instantaneous temperature differences, but rather making decisions based on the predicted remaining cooling time.

[0068] S1022. Based on the current temperature of each air-cooled aggregate, the corresponding target discharge temperature, and the remaining pre-cooling time, determine the cooling capacity Q required per unit time for each air-cooled aggregate bin in the current cycle. i .

[0069] Specifically, in multiple air-cooled aggregate bins, each bin contains different types of aggregate with varying thermophysical properties (specific heat capacity, density, etc.) and heat transfer characteristics. This application's solution cools the aggregate in each bin from its current temperature to the target outlet temperature within the remaining pre-cooling time. Based on the heat balance equation, it determines how much cooling capacity should be allocated to each bin per unit time within the current control cycle. Specifically, the required air-cooling capacity Q for each air-cooled aggregate bin per unit time in the current cycle is... i (Unit: cal / min or kcal / min) satisfies:

[0070]

[0071] Where, m i c represents the mass (in kg) of air-cooled aggregate required for the current i-th air-cooled aggregate bin. i For the specific heat capacity (unit: kcal / kg·℃) of the i-th air-cooled aggregate, T 1i T 2i These represent the current average temperature and target discharge temperature of the i-th air-cooled aggregate, respectively. s η represents the current remaining precooling time for the air-cooled aggregate. i The current heat exchange efficiency of the i-th air-cooled aggregate, i.e. the effectiveness of the cooling effect of each aggregate bin, is a comprehensive coefficient related to aggregate particle size, porosity, material layer thickness, and current temperature. It can be estimated by fitting current and previous data or by corresponding models.

[0072] S1023, Based on the cooling capacity Q required per unit time in the current cycle. i Determine the air supply volume W per unit time. i and wind speed v i :

[0073] Specifically, in one embodiment of this application, the solution calculates the energy demand (cooling load) and converts it into fluid parameters (airflow, air velocity) that can be directly adjusted by on-site equipment (fans, dampers), and controls the cooling process by adjusting the airflow and air velocity distribution. Specifically, the airflow W per unit time is determined based on the currently required cooling load. i (m) 3 ( / min) satisfies:

[0074] ,

[0075] Where, p imax For the maximum air supply of the i-th air-cooled aggregate silo, γ a For the density of the cooling air, I i o I i in These are the enthalpy of the air outlet and air inlet of the i-th pre-cooled air-cooled aggregate bin, respectively.

[0076] For example, in one embodiment, the inlet air temperature is set to be 10-15°C lower than the final cooling temperature of the aggregate, such as -7°C. Further, based on the temperature difference between the inlet and return air of 10-14°C (take 12°C), the return air temperature is 5±1°C. The relative humidity of the cooling medium (air) is assumed to be 100% (i.e., saturated humid air). Then, based on the inlet and return air temperatures, the corresponding enthalpy of the inlet and return air can be calculated by referring to the enthalpy-humidity chart of humid air using the internal lookup method.

[0077] Furthermore, based on the air supply volume, the air velocity v inside the silo for each air-cooled aggregate can be obtained. i (m / s):

[0078]

[0079] Among them, F i The calculated cross-sectional area of ​​the air-cooled zone of the pre-cooled silo is the effective air-cooled flow area of ​​the air-cooled aggregate silo, which is taken as 70% to 80% of the total cross-sectional area.

[0080] Furthermore, in one embodiment, the air supply volume W per unit time is determined according to the above scheme. i and wind speed v i Subsequently, this application also includes:

[0081] S1024. Determine whether the total air supply of each air-cooled aggregate bin is greater than the maximum air supply of the refrigeration unit.

[0082] S1025. If not, control the current air supply volume and speed to be supplied to each air-cooled aggregate bin for the current cycle duration of pre-cooling.

[0083] S1026. If so, control the refrigeration unit to supply air at the maximum air supply volume, and adjust the current air supply volume and wind speed of each air-cooled aggregate according to the maximum air supply volume.

[0084] Preferably, adjusting the current air supply volume of each air-cooled aggregate according to the maximum air supply volume further includes:

[0085] Calculate the temperature difference ΔT between the current and target outlet temperatures of each air-cooled aggregate bin. i .

[0086] Specifically, the proposed solution first calculates the temperature difference ΔT between the current and target outlet temperatures of each air-cooled aggregate bin. iThe real-time temperature difference between the current temperature and the target exit temperature reflects the urgency of the current cooling process. The temperature difference ΔT i The larger the value, the greater the Δt value within the current control period of the corresponding aggregate bin. i The more temperature needs to be lowered, i.e., ΔT i / △t i The larger the aggregate bin, the more urgent the cooling requirement. Since the control cycle of each aggregate bin is the same at each stage, the temperature difference can be used to characterize the weights in the subsequent calculation.

[0087] Based on the current temperature difference and corresponding heat exchange efficiency of each air-cooled aggregate bin, determine the air supply allocation weight for each air-cooled aggregate bin:

[0088] ,

[0089] Where, λ i Assign a weight to the air supply of the i-th air-cooled aggregate bin, where n is the current number of air-cooled aggregate bins, and η is the weight of the air supply. j , △T j These represent the heat exchange efficiency and current temperature difference for the j-th aggregate, respectively. Furthermore, this application's scheme incorporates heat exchange efficiency when calculating the corresponding weights, reflecting the effectiveness and efficiency of cooling the aggregates when a certain volume of cold air is delivered. Low heat exchange efficiency means that more cold air is needed to achieve the desired cooling effect.

[0090] The current air supply and velocity of each air-cooled aggregate are adjusted based on the maximum air supply and each weight.

[0091] The proposed solution pre-cools aggregates in separate compartments based on their characteristics, adjusts the cooling process in stages according to the current pre-cooling status of each aggregate, and dynamically allocates weighting factors to ensure a more stable load on the refrigeration unit, reducing peak power demand and contributing to extended equipment lifespan and energy savings. Furthermore, at the end of the pre-cooling cycle, both the large and small aggregate bins simultaneously reach their set target temperatures, ensuring that all aggregates, large and small, used in each concrete batch enter the mixer at the preset target temperature, guaranteeing high uniformity and precision of the concrete's outlet temperature from the source.

[0092] S103. Based on the current air supply volume, control the pre-cooling cycle duration of the air-cooled aggregate bins, and cycle to the next control cycle until each air-cooled aggregate reaches the target outlet temperature.

[0093] Specifically, within each control cycle, based on the temperature difference between the current aggregate bins and the target temperature, as well as the aggregate characteristics, the parameters for supplying cold air to each bin within that cycle are determined to control the opening and closing degree of the air valves and / or the air velocity in the corresponding air-cooled aggregate bins, thus performing cyclical pre-cooling control. The system executes this cycle repeatedly until all aggregate bins reach the target temperature.

[0094] S104. Determine the demand for each air-cooled aggregate based on the current concrete mix proportion, control the opening and closing of the corresponding air-cooled aggregate bin valves, and weigh the cooled air-cooled aggregate.

[0095] Specifically, in one embodiment, each air-cooled aggregate bin of this application is equipped with a weighing hopper at its bottom, and a weighing sensor is installed inside the weighing hopper. A controllable valve is installed at the junction of the bottom of the aggregate bin and the top of the weighing hopper. The valve can be a large-diameter sealing gate valve or a double-disc butterfly valve, and its core function is isolation and sealing. When the valve is closed, it can effectively and completely cut off the material flow and completely separate the aggregate load in the aggregate bin from the weighing system below. The weighing of the cooled air-cooled aggregate includes:

[0096] S1031. Based on the current concrete mix design requirements, determine the target weight and number of weighings for each air-cooled aggregate in a single weighing.

[0097] Specifically, in concrete production and construction, there may be multiple mixers, or pre-cooled aggregate may be used for multiple mixing processes. Each batch of concrete has a specific aggregate mix requirement, and each weighing hopper has a maximum safe and accurate weighing capacity V in one weighing cycle. max To achieve the required concrete mix proportions uniformly, this application method employs batch-wise proportional weighing of pre-cooled aggregates. Specifically, the number of weighing times is m = max{M}. i t / V max}, where M i t Given the total weight (or total mass) of the i-th aggregate required in the current concrete production, after obtaining the number of weighings, the target weight (mass) for each weighing can be determined based on the total mass required for each aggregate.

[0098] S1032. Control the opening of the bottom valves of each air-cooled aggregate bin to allow the cooled air-cooled aggregate to fall from the air-cooled aggregate bin into the weighing hopper.

[0099] S1033. If the weight of the air-cooled aggregate measured by the weighing hopper reaches the preset proportion of the current single target weight, control the bottom valve of the corresponding air-cooled aggregate bin to close.

[0100] S1034, Cycle the current weight M of the air-cooled aggregate. i Compared with the current single target weight M i_target Comparison, if M i If insufficient, the valve will be briefly opened again for inching adjustments and replenishment until the current weight reaches the target weight M for the current single batch. i_target ;

[0101] S1035. Proceed to the next weighing cycle until all air-cooled aggregate bins have been weighed.

[0102] The valve and weighing sensor system of the above-mentioned solution in this application are both connected to the PLC control system, forming an automated closed-loop process of "valve opening for unloading - sensor weighing in real time - valve closing after reaching the set value - feeding after weighing is completed". It can effectively replace the traditional unloading valve, has a high degree of integration, improves the overall unloading adjustment accuracy of the system, and shortens the system response delay time.

[0103] A second aspect of this application provides an air-cooled system for pre-cooling multiple aggregates, the system comprising:

[0104] An aggregate pre-cooling silo includes multiple air-cooled aggregate bins, wherein an air window is provided on one side of each air-cooled aggregate bin, and the air window is connected to a refrigeration unit through an air duct;

[0105] Refrigeration unit, used to generate air-cooled cold source according to instructions and supply it to the corresponding air-cooled aggregate bin;

[0106] The air-cooled control subsystem is used to acquire temperature information of each air-cooled aggregate bin and generate control commands to execute the steps described in any of the above methods.

[0107] The air-cooling control subsystem of this application is connected to the corresponding device or equipment via wired or wireless communication. The air-cooling control subsystem can send control commands and can acquire the temperature of each air outlet, air return outlet and corresponding key point of the aggregate pile collected by the corresponding sensors in real time. Based on the current temperature, target temperature and real-time temperature difference of each aggregate bin, the subsystem can dynamically generate adjustment commands to adjust the opening degree of the corresponding valve and / or the fan speed, thereby achieving precise cooling on demand.

[0108] Specifically, such as Figure 2-3 The figures shown are schematic diagrams of a multi-aggregate precooling air-cooled system and corresponding full-scale structural diagrams, according to one embodiment of this application. The aggregate precooling silo is internally divided into multiple aggregate bins, and each single-line aggregate bin has two or more air-cooled aggregate bins to precool different aggregates.

[0109] Preferably, the air-cooled aggregate bin has an air vent on one side, which is connected to the refrigeration unit via an air duct. The air vent includes an air inlet and an air outlet. The air inlet is located at the bottom of the air-cooled aggregate bin and is connected to the refrigeration unit via an air inlet duct to allow cold air to enter the bin and cool the aggregate. The air outlet is located at the top of the air-cooled aggregate bin and is equipped with a return air device, which is connected to the return air duct of the refrigeration unit. Under the suction of the return air device, the cold air circulates back to the refrigeration unit from bottom to top. Each bin can also be equipped with an arc-shaped air guide plate as needed to form a "bottom-in, top-out" vortex airflow field, and the wind speed can be adjusted within a preset range.

[0110] Furthermore, in one embodiment, an air chamber connected to the corresponding air inlet window is provided inside the air-cooled aggregate bin. The air chamber is arranged across two opposite walls of the bin, thus forming an "air wall" to ensure that the airflow can cover the entire cross-section of the bin and eliminate cooling dead zones. The air chamber has multiple layers of air outlets evenly arranged vertically. For example, on one side wall of the air chamber (the side facing the air-cooled aggregate pile), multiple layers and multiple rows of air outlets (such as strip-shaped air outlets or array-shaped circular holes) are evenly opened vertically. This ensures that cold air can be evenly delivered from the bottom of the air-cooled aggregate pile upwards, achieving three-dimensional, penetrating cooling of the deep aggregate pile. This results in a large contact area and long contact time (long penetration path) between the cold air and the air-cooled aggregate, effectively solving the problems of "airflow short-circuiting" and insufficient central cooling caused by traditional lateral air supply. The above-mentioned solution of this application can effectively achieve uniform and sufficient heat exchange, significantly shortening the cooling time of the air-cooled aggregate.

[0111] Preferably, in one embodiment, the air chamber of the above-described solution of this application is equipped with a regulating valve and a fan at the connection between the air chamber and the air window, and is capable of communicating with the air-cooling control subsystem to receive adjustment commands based on the temperature of the air-cooled aggregate to adjust the opening degree of the air inlet valve and / or the speed of the fan. The fan is installed at the air inlet end of the air chamber and its speed is adjustable. The regulating valve is installed at the air chamber inlet and / or the corresponding air outlet, used to precisely distribute and adjust the air volume delivered to the air outlets at different height levels.

[0112] The working logic of the above-mentioned scheme in this application is as follows: After the refrigeration unit generates corresponding cold air to the air inlet window, the cold air is further pressurized or its speed adjusted by the fan in the corresponding air chamber, and then distributed through the regulating valve before entering the transverse air chamber. Finally, it is evenly sprayed into the air-cooled aggregate pile from the multi-layer air outlets of the air chamber. In this way, the cold air can penetrate evenly to the side of the corresponding air-cooled aggregate pile away from the air chamber, and it also facilitates the more efficient and rapid return of the cold air to the corresponding return air channel. This achieves sufficient, uniform, and efficient heat exchange between the air-cooled aggregate and the cold air in the air-cooled aggregate bin, improving the pre-cooling effect of the air-cooled aggregate.

[0113] Furthermore, in the multi-aggregate air-cooled precooling system of this application, an integrated aggregate conveying subsystem is also provided. The conveying subsystem is located above each air-cooled aggregate precooling silo to convey the air-cooled aggregate from above to the corresponding air-cooled aggregate bin for precooling. The system as a whole can include multiple single-line aggregate precooling silos and share a single conveying subsystem.

[0114] Preferably, such as Figure 3 As shown in one embodiment of this application, the air-cooled aggregate conveying section of the conveying subsystem includes a horizontal conveying device and a movable distribution hopper. The movable distribution hopper can move horizontally back and forth along the track and move to connect with the receiving air valve at the top of each air-cooled aggregate bin to convey the received aggregate to the corresponding aggregate bin.

[0115] Furthermore, the movable distribution hopper includes a movable trolley and a distribution hopper fixedly connected to one side of the movable trolley. The other side of the movable trolley is configured as an inclined lifting section. The overall support structure of the movable trolley is triangular (e.g., a right triangle), with its side opposite the distribution hopper configured as an inclined ramp forming the inclined lifting section. The inclined lifting section and the horizontal conveying section are connected by the same conveyor belt to transport aggregates. Alternatively, different conveyor belts can be used to transport aggregates in coordination. The horizontal conveying device and the inclined conveying section include corresponding conveyor units, each including active or driven wheel sets to drive the conveyor belt to transport aggregates. The horizontal conveying device is divided into a first horizontal conveying section and a second horizontal conveying section by the movable trolley. The movable trolley can move back and forth along the entire horizontal conveying device via the wheel sets at its bottom, changing the relative lengths of the first and second horizontal conveying sections during movement. The aggregates are further transported through the first horizontal conveying section of the horizontal conveying device to the inclined lifting section of the movable trolley, and then transported to the end of the inclined lifting section before entering the distribution hopper. Furthermore, the movable material distribution hopper can move horizontally back and forth along the horizontal conveying device, thereby connecting with the material receiving air valve at the top of each aggregate bin.

[0116] The solution provided in this application can be implemented based on a single-line aggregate pre-cooling silo or in parallel based on multiple air-cooled aggregate pre-cooling silos, with the entire system sharing a single integrated conveyor subsystem. Compared to traditional solutions that require a large aggregate stockpile, multiple conveyor belts, and independent pre-cooling silos, the solution in this application combines the stockpile, pre-cooling silo, and batching station into a vertically arranged unit, significantly reducing the floor space required. The movable feed hopper allows a single main feed line to serve different cooled aggregate bins in multiple pre-cooling silos, greatly simplifying the top structure. Furthermore, the first conveyor subsystem in this application dynamically and precisely couples the aggregate conveying and cooling bin feeding processes via a single conveyor belt, greatly improving the continuity and automation level of the entire system.

[0117] In one embodiment, this application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, causes the processor to perform the following steps:

[0118] Based on the characteristics of each aggregate, control the input of different aggregate bins into the corresponding air-cooled aggregate bins;

[0119] The precooling time of each air-cooled aggregate is divided into multiple control cycles;

[0120] Collect the temperature of each air-cooled aggregate in the current cycle, and based on the temperature of each air-cooled aggregate and the corresponding target discharge temperature, determine the air supply parameters per unit time for each air-cooled aggregate bin in the current cycle.

[0121] Based on the current air supply parameters, control the duration of the pre-cooling cycle for each air-cooled aggregate bin, and then cycle to the next control cycle until each air-cooled aggregate reaches the target outlet temperature.

[0122] Determine the proportion of each air-cooled aggregate based on the current concrete mix ratio, control the opening and closing of the corresponding air-cooled aggregate bin valves, and weigh the cooled air-cooled aggregate.

[0123] In one embodiment, such as Figure 4 As shown, this application also provides a computer device, which includes a processor, a memory, and a network interface connected via a system bus. The processor of the computer device provides computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs. When the computer programs are executed by the processor, the processor performs the following steps:

[0124] Based on the characteristics of each aggregate, control the input of different aggregate bins into the corresponding air-cooled aggregate bins;

[0125] The precooling time of each air-cooled aggregate is divided into multiple control cycles;

[0126] Collect the temperature of each air-cooled aggregate in the current cycle, and based on the temperature of each air-cooled aggregate and the corresponding target discharge temperature, determine the air supply parameters per unit time for each air-cooled aggregate bin in the current cycle.

[0127] Based on the current air supply parameters, control the duration of the pre-cooling cycle for each air-cooled aggregate bin, and then cycle to the next control cycle until each air-cooled aggregate reaches the target outlet temperature.

[0128] Determine the proportion of each air-cooled aggregate based on the current concrete mix ratio, control the opening and closing of the corresponding air-cooled aggregate bin valves, and weigh the cooled air-cooled aggregate.

[0129] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM, Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), etc.

[0130] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0131] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for controlling air cooling in multi-aggregate precooling, applied to a multi-aggregate precooling system, characterized in that, The method includes: Based on the characteristics of each aggregate, control the input of different aggregate bins into the corresponding air-cooled aggregate bins; The precooling time of each air-cooled aggregate is divided into multiple control cycles; Collect the temperature of each air-cooled aggregate in the current cycle, and based on the temperature of each air-cooled aggregate and the corresponding target discharge temperature, determine the air supply parameters per unit time for each air-cooled aggregate bin in the current cycle. Based on the current air supply parameters for each unit of time, control the air cooling supply to each air-cooled aggregate bin for the current cycle duration, and then cycle to the next control cycle until each air-cooled aggregate reaches the target outlet temperature. Determine the demand for each air-cooled aggregate based on the current concrete mix proportion, control the opening and closing of the corresponding air-cooled aggregate bin valves, and weigh the cooled air-cooled aggregate. The method further includes: Determine the remaining precooling time for each air-cooled aggregate, and based on the current temperature of each air-cooled aggregate, the corresponding target outlet temperature, and the remaining precooling time, determine the cooling capacity required per unit time for each air-cooled aggregate bin in the current cycle. Q i and air supply volume W i ; If the total air supply to all air-cooled aggregate bins is greater than the maximum air supply of the refrigeration unit, the refrigeration unit will be controlled to supply air at its maximum capacity. The air supply allocation weight for each air-cooled aggregate bin will be determined based on the current temperature difference and corresponding heat exchange efficiency. λ i : ， in, n This represents the current quantity of air-cooled aggregate bins. η j、 △T j They correspond to the first j The heat exchange efficiency of the aggregate and the current temperature difference.

2. The method according to claim 1, characterized in that, The method further includes: Based on the cooling capacity required per unit time Q i Determine the air supply volume per unit time. W i and wind speed v i : ， in, p i max For the first i The maximum air supply of the air-cooled aggregate silo γ a The density of the cooling air. I i o、 I i in These are the enthalpy of the air outlet and inlet of the i-th pre-cooled air-cooled aggregate bin, respectively. F i For the first i Air-cooled aggregate silo with effective air-cooled flow area.

3. The method according to claim 2, characterized in that, The required air cooling capacity per unit time for each air-cooled aggregate bin in the current cycle Qi satisfy: ， in, m i For the current number i The quality of air-cooled aggregate in air-cooled aggregate bins is required. c i For the corresponding number i Specific heat capacity of air-cooled aggregate, T 1i、 T 2i They correspond to the first i The current average temperature and target discharge temperature of the air-cooled aggregate. η i The heat exchange efficiency of the current i-th air-cooled aggregate is... t s This represents the current remaining precooling time for the air-cooled aggregate.

4. The method according to claim 1, characterized in that, The method further includes: If the total air supply to each air-cooled aggregate bin is not greater than the maximum air supply of the refrigeration unit, then the air supply to each air-cooled aggregate bin will be controlled according to the current air supply and wind speed for the current cycle duration.

5. The method according to any one of claims 1-4, characterized in that, Each air-cooled aggregate bin is equipped with a weighing hopper at its bottom, and a weighing sensor is installed inside the hopper. The weighing of the cooled air-cooled aggregate includes: Based on the current concrete mix design requirements, determine the target weight and number of weighings for each air-cooled aggregate in a single weighing. Control the opening of the bottom valves of each air-cooled aggregate bin to allow the cooled air-cooled aggregate to fall from the air-cooled aggregate bin into the weighing hopper; If the weight of the air-cooled aggregate measured by the weighing hopper reaches a preset proportion of the single target weight, the valve at the bottom of the corresponding air-cooled aggregate bin will be closed. The system continuously compares the current weight of the air-cooled aggregate with the target weight for a single operation. If the current weight of the aggregate is insufficient, the valve is briefly opened again to perform a jog-style fine-tuning and replenishment until the current weight reaches the target weight for a single operation. Proceed to the next weighing cycle until all air-cooled aggregate bins have been weighed.

6. A multi-aggregate pre-cooling air-cooling system, characterized in that, The system includes: An aggregate pre-cooling silo includes multiple air-cooled aggregate bins, wherein an air window is provided on one side of each air-cooled aggregate bin, and the air window is connected to a refrigeration unit through an air duct; Refrigeration unit, used to generate air-cooled cold source according to instructions and supply it to the corresponding air-cooled aggregate bin; An air-cooled control subsystem is used to acquire temperature information of each air-cooled aggregate bin and generate control commands to execute the method described in any one of claims 1-5.

7. The system according to claim 6, characterized in that, The air window includes an air inlet window and an air outlet window, and the air inlet window is located at the bottom of the air-cooled aggregate bin; The air-cooled aggregate bin is equipped with an air chamber connected to the corresponding air inlet window. The air chamber is equipped with a regulating valve and a fan at the connection point with the air inlet window to regulate the air supply volume and / or wind speed. The bottom of the air-cooled aggregate bin is equipped with a weighing hopper, and a valve is installed at the junction of the bottom of the air-cooled aggregate bin and the top of the weighing hopper.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, the processor performs the steps of the method as described in any one of claims 1 to 5.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the computer program is executed by the processor, it causes the processor to perform the steps of the method as described in any one of claims 1 to 5.

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