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CN-122008412-A - Method, device and system for controlling temperature of concrete mixing ingredients

CN122008412ACN 122008412 ACN122008412 ACN 122008412ACN-122008412-A

Abstract

The application relates to the technical field of temperature control, in particular to a method, a device and a system for controlling the temperature of concrete stirring ingredients, wherein the method comprises the steps of monitoring the aggregate conveying weight in real time and recording the feeding time and the temperature in batches according to a preset step length; the method comprises the steps of weighing aggregate of corresponding batch according to target weight, calculating equivalent precooling time, estimating conduction difficulty degree by combining coarse aggregate proportion, estimating heat residue degree of the aggregate, calculating flake ice compensation quantity according to initial temperature difference and heat residue degree, and adjusting batching temperature by controlling ice adding operation. According to the application, by quantifying the heat of internal hysteresis of aggregate and implementing feedforward flake ice compensation, the problem of unpredictable thermal rebound of the temperature of the concrete outlet is solved, and the accuracy of temperature control of concrete stirring ingredients is improved.

Inventors

  • YANG BAOZHONG
  • WU XIANGFENG

Assignees

  • 义乌市晟通新型建材有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (10)

  1. 1. A method for controlling the temperature of a concrete mixing batch, the method comprising the steps of: monitoring the aggregate conveying weight in real time, dividing the aggregate continuously entering the pre-cooling bin into a plurality of batches according to a preset weight step length, and recording the time and the surface temperature of each batch of aggregate entering the pre-cooling bin; when the batching is needed, according to the preset target weight of the batching, aggregate of all batches participating in the batching is called, and the equivalent precooling time length of the aggregate participating in the batching in the precooling bin is calculated based on the time of the aggregate of all batches entering the precooling bin; The proportion of coarse aggregates in the formula of the current batch is obtained so as to estimate the easiness of heat conduction from the surface of the aggregates to the center of the aggregates, and the heat residue of each batch of aggregates in the current batch is estimated by combining the equivalent precooling time length; According to the difference between the surface temperature of each batch of aggregate in the current batching and the acquired refrigerant temperature and the heat residual degree of the aggregate, the flake ice compensation quantity required for counteracting the residual heat of the aggregate is calculated, and the ice adding operation is controlled according to the flake ice compensation quantity so as to regulate the temperature of the concrete stirring batching.
  2. 2. A method of controlling the temperature of a concrete mix batch according to claim 1, wherein said retrieving all batches of aggregate involved in the batch comprises: Calculating the ratio of the preset target weight of the current ingredient to the preset weight step length, and recording the ratio as the number of the reference batches; calculating the sum value of the mixing buffer coefficient 1 and the preset value, upwardly rounding the product of the sum value and the number of the reference batches, and taking the rounded result as the total batch number of aggregates needed by participating in the batching; And (3) arranging aggregates of all batches in the pre-cooling bin according to a time sequence, and taking the aggregates of the total batch times in the arrangement result as aggregates participating in the current batching.
  3. 3. The method for controlling the temperature of a concrete mixing ingredient according to claim 2, wherein the calculating the equivalent precooling time length of the aggregate participating in the present ingredient in the precooling bin comprises: Calculating the time interval between the time when each batch of aggregate enters the pre-cooling bin and the starting time of the current batching in the aggregates of all batches participating in the current batching; marking aggregates of the number of the previous basic batches in time sequence as core aggregates in aggregates of all batches participating in the current batching, setting the weight of the corresponding time interval as 1, and linearly reducing the weight of the corresponding time interval of the aggregates of the rest batches from 1 to 0 in time sequence; And taking the result of weighted average of the time intervals corresponding to the aggregates of all batches and the weights of the time intervals as the equivalent precooling duration of the aggregates participating in the current batching in the precooling bin.
  4. 4. A method of controlling the temperature of a concrete mix formulation according to claim 1, wherein the ease with which heat is transferred from the surface of the aggregate to the centre of the aggregate The estimation method of (1) comprises the following steps: calculating the product of the proportion of coarse aggregate in the formula of the current ingredient and a preset internal heat transfer correction coefficient, and taking the difference value of 1 and the product as the easiness of heat conduction from the surface of the aggregate to the center of the aggregate, wherein the value of the preset internal heat transfer correction coefficient is positioned And (3) inner part.
  5. 5. A method of controlling the temperature of a concrete mix batch according to claim 1, wherein said evaluating the heat residual of each aggregate in the batch comprises: the heat residue of the aggregate comprises surface heat residue and center heat residue, wherein the surface heat residue of the jth aggregate in the current batch Residual degree of central heat The expressions of (2) are respectively: 、 In the formula (I), in the formula (II), Representing the preset surface heat exchange efficiency of the jth aggregate in the current batching; representing the equivalent precooling time length of the aggregate participating in the current batching in a precooling bin; indicating how easily heat is conducted from the surface of the aggregate to the center of the aggregate, and e indicating the natural constant.
  6. 6. The method for controlling the temperature of a concrete mixing batch according to claim 5, wherein the method for setting the surface heat exchange efficiency is as follows: in the current batching, calculating the deviation between the temperature of each batch of aggregate when leaving the pre-cooling bin and the preset theoretical discharging temperature; if the deviation of the aggregate in the current batch is within a closed interval from a preset first threshold value to a preset second threshold value, the surface heat exchange efficiency of the aggregate in the current batch is a preset value; If the deviation of the aggregate in the current batch is smaller than a preset first threshold value, the preset value is adjusted upwards, and the up-adjustment result is used as the surface heat exchange efficiency of the aggregate in the current batch; If the deviation of the aggregate in the current batch is larger than a preset second threshold value, the preset value is adjusted downwards, and the down-adjustment result is used as the surface heat exchange efficiency of the aggregate in the current batch.
  7. 7. A method of controlling the temperature of a concrete mix formulation according to claim 1, wherein said calculating the amount of flake ice compensation required to offset the residual heat of the aggregate comprises: determining delayed release heat energy of the aggregates in the current batching based on the weight of each batch of aggregates in the current batching, the specific heat capacity of the aggregates, the difference between the surface temperature of the aggregates when the aggregates enter the pre-cooling bin and the acquired coolant temperature and the heat residue of the aggregates; And calculating the result of multiplying the delayed release heat energy by a preset compensation gain coefficient, and taking the ratio of the multiplication result to the latent heat of the phase change of ice as the compensation quantity of the flake ice.
  8. 8. The method of claim 7, wherein the delayed release of heat energy from the aggregate in the batch The expression of (2) is: In the formula (I), in the formula (II), Representing the weight of the jth aggregate in the current batching; The specific heat capacity of the jth aggregate in the current batching is represented; representing the difference value between the surface temperature of the jth aggregate in the current burden and the acquired refrigerant temperature when the jth aggregate enters the precooling bin; Indicating the aggregate total batch participating in the batching.
  9. 9. A concrete mix batch temperature control device having a computer program stored therein, wherein the computer program when executed by a processor implements a concrete mix batch temperature control method as claimed in any one of claims 1 to 8.
  10. 10. A concrete mix batch temperature control system comprising a memory, a processor and a computer program stored in the memory and running on the processor, wherein the processor, when executing the computer program, carries out the steps of a concrete mix batch temperature control method according to any one of claims 1-8.

Description

Method, device and system for controlling temperature of concrete mixing ingredients Technical Field The application relates to the technical field of temperature control, in particular to a method, a device and a system for controlling the temperature of concrete mixing ingredients. Background In the construction of large-volume concrete engineering (such as a dam, a nuclear power station, a large bridge anchorage and the like), the strict control of the outlet temperature of concrete is a key for preventing the generation of cracks. Among them, pre-cooling of coarse aggregates generally takes on the main task of reducing the total enthalpy of the concrete. The conventional aggregate precooling mode comprises air cooling or water cooling, namely, placing the aggregate in a precooling bin, and introducing a refrigerant to cool. In the actual production process, the engineering pain points faced by the prior art are that continuous feeding lacks independent time marks, so that the actual residence time of aggregate in a bin cannot be known, the precooling effect is difficult to control and is influenced by heat conduction hysteresis of the aggregate, the unbalanced state of external cold and internal heat cannot be perceived only by monitoring the surface temperature, the internal latent heat is released during stirring, unpredictable thermal rebound is initiated, the existing feedback adjustment lacks coping capability, and the accuracy of temperature control of concrete stirring ingredients is reduced. Disclosure of Invention In a first aspect, an embodiment of the present application provides a method for controlling a temperature of a concrete mix formulation, the method comprising the steps of: monitoring the aggregate conveying weight in real time, dividing the aggregate continuously entering the pre-cooling bin into a plurality of batches according to a preset weight step length, and recording the time and the surface temperature of each batch of aggregate entering the pre-cooling bin; when the batching is needed, according to the preset target weight of the batching, aggregate of all batches participating in the batching is called, and the equivalent precooling time length of the aggregate participating in the batching in the precooling bin is calculated based on the time of the aggregate of all batches entering the precooling bin; The proportion of coarse aggregates in the formula of the current batch is obtained so as to estimate the easiness of heat conduction from the surface of the aggregates to the center of the aggregates, and the heat residue of each batch of aggregates in the current batch is estimated by combining the equivalent precooling time length; According to the difference between the surface temperature of each batch of aggregate in the current batching and the acquired refrigerant temperature and the heat residual degree of the aggregate, the flake ice compensation quantity required for counteracting the residual heat of the aggregate is calculated, and the ice adding operation is controlled according to the flake ice compensation quantity so as to regulate the temperature of the concrete stirring batching. Preferably, the step of preparing aggregate of all batches participating in the current batching comprises the following steps: Calculating the ratio of the preset target weight of the current ingredient to the preset weight step length, and recording the ratio as the number of the reference batches; calculating the sum value of the mixing buffer coefficient 1 and the preset value, upwardly rounding the product of the sum value and the number of the reference batches, and taking the rounded result as the total batch number of aggregates needed by participating in the batching; And (3) arranging aggregates of all batches in the pre-cooling bin according to a time sequence, and taking the aggregates of the total batch times in the arrangement result as aggregates participating in the current batching. Preferably, the calculating the equivalent precooling duration of the aggregate participating in the current batching in the precooling bin includes: Calculating the time interval between the time when each batch of aggregate enters the pre-cooling bin and the starting time of the current batching in the aggregates of all batches participating in the current batching; marking aggregates of the number of the previous basic batches in time sequence as core aggregates in aggregates of all batches participating in the current batching, setting the weight of the corresponding time interval as 1, and linearly reducing the weight of the corresponding time interval of the aggregates of the rest batches from 1 to 0 in time sequence; And taking the result of weighted average of the time intervals corresponding to the aggregates of all batches and the weights of the time intervals as the equivalent precooling duration of the aggregates participating in the current batching in the precooling bin