Method and device for regulating and controlling working performance of concrete in concrete mixing truck

Abstract

The invention discloses a method and device for regulating and controlling the working performance of concrete in a concrete mixing truck, and the device comprises a concrete resistance detection unit which comprises a plurality of concrete resistance detection modules and is used for reading the stress value of the inner wall of a mixing tank; the stirring tank rotation resistance detection unit comprises a plurality of rotation characteristic detection modules and a torque sensor, and is used for reading the rotation angular acceleration and angular velocity of the stirring tank; reading the driving torque of the stirring tank driving device; the data processing unit comprises a data recording module and a state identification module; the data recording module is used for recording read data; the state judgment module is used for judging the working performance state of the concrete mixture according to the recorded data; and the working performance regulation and control unit is used for receiving a judgment result of the state judgment module and sending a regulation and control instruction to the stirring tank driving device and the spraying module according to the judgment result. The device can accurately monitor the working performance of concrete in the transportation process in real time and automatically adjust the working performance.

Description

Technical Field

[0001] This invention relates to the field of concrete transportation equipment technology, and more specifically to a method and apparatus for regulating the workability of concrete in a concrete mixer truck. Background Technology

[0002] Self-compacting concrete, also known as self-leveling, non-vibrating concrete, refers to concrete that automatically fills areas with dense reinforcement, complex structures, and steel pipes—areas where concrete pouring is difficult—without requiring any vibration. During pouring, it does not exhibit segregation or bleeding, and possesses excellent fluidity, filling ability, and gap-passing capacity. Therefore, high fluidity and high stability are important indicators for evaluating the superior performance of self-compacting concrete.

[0003] However, in actual construction, factors such as regional material fluctuations, rapid water loss of concrete in summer due to high temperatures, and long transportation distances can easily lead to significant losses in self-compacting concrete upon arrival at the pouring site, resulting in a loss of its self-compacting properties and failure to meet construction requirements. On-site solutions to this problem often involve adding water or admixtures a second time to restore the workability of the self-compacting concrete. However, this remedial approach has significant drawbacks. Firstly, excessive water addition directly affects the mechanical properties of the concrete. Secondly, the lack of standardized admixture additions makes it prone to segregation due to over-admixture, also impacting construction quality. Currently, domestic and international scholars have conducted some research on this issue. For example, patent application CN202111029377.6, entitled "An Information-Based Intelligent Control Method for the Workability of Concrete Mixtures," calculates the amount of admixture required to restore the initial workability of concrete of different strength grades after static loss using an intelligent control equation. Then, the calculated amount of admixture is added back to compensate for this loss, thereby restoring the concrete's workability. However, self-compacting concrete is different from ordinary concrete with large slump. It has higher requirements for workability. Even if it loses its self-compacting property due to a large loss, its slump is still above 200mm. At the same time, according to construction experience, the time loss under static conditions is much different from that under dynamic conditions, making it difficult to operate using this method.

[0004] Therefore, how to monitor the workability of self-compacting concrete in real time and accurately during transportation, and adjust it automatically in a timely manner, is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of the above problems, the present invention provides a method and apparatus for controlling the workability of concrete in a concrete mixer truck, so as to at least solve some of the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] On the one hand, the present invention provides a concrete workability control device in a concrete mixer truck, comprising: a concrete resistance detection unit, a mixing tank rotation resistance detection unit, a data processing unit, and a workability control unit;

[0008] The concrete resistance detection unit includes multiple concrete resistance detection modules arranged on the inner wall of the mixing tank, used to read the force value in the direction parallel to the intersection of the inner wall of the mixing tank and the plane perpendicular to the rotation axis of the mixing tank.

[0009] The mixing tank rotation resistance detection unit includes multiple rotation feature detection modules installed on the mixing tank rotation shaft for reading the mixing tank rotation angular acceleration and rotation angular velocity; and a torque sensor installed on the mixing tank drive device for reading the drive torque of the mixing tank drive device.

[0010] The data processing unit includes a data recording module and a state identification module; the data recording module is used to record the force value, the angular acceleration of the mixing tank, the angular velocity of the mixing tank, and the driving torque at preset time intervals; the state identification module is used to determine the workability state of the concrete mix based on the recorded data;

[0011] The performance control unit includes a central control module and a spraying module arranged inside the mixing tank. The central control module is used to receive the judgment result of the state identification module and issue control commands to the mixing tank drive device and the spraying module according to the judgment result. The spraying module is used to store admixtures with the function of controlling the workability of concrete and to add the admixtures into the concrete mixture according to the command of the central control module.

[0012] Furthermore, each of the concrete resistance detection modules includes multiple tension-compression sensors and a rigid force transmission rod connected in series with the multiple tension-compression sensors;

[0013] Multiple tension-compression sensors are evenly arranged circumferentially on the same plane perpendicular to the rotation axis of the mixing tank. They are used to read the tension and compression values ​​in the direction parallel to the tangent of the inner wall of the mixing tank, and the average value of the data read by multiple tension-compression sensors in each concrete resistance detection module is used as the force value of the corresponding plane.

[0014] The two ends of the rigid force transmission rod are respectively hinged to the sensing ends of two tension-compression sensors to transmit the tension and compression values.

[0015] Furthermore, each of the rotation feature detection modules includes an angular acceleration sensor and an angular velocity sensor arranged at the same point on the rotation axis of the mixing tank; the angular acceleration sensor is used to read the rotational angular acceleration of the mixing tank; the angular velocity sensor is used to read the rotational angular velocity of the mixing tank.

[0016] Furthermore, the preset time interval for data recording by the data recording module is five to thirty minutes.

[0017] Furthermore, the mixing tank drive device adjusts the drive torque according to the instructions issued by the central control module to achieve a constant rotational angular velocity of the mixing tank; at this time, the state identification module is used to compare the current force value and the rotational angular acceleration of the mixing tank with the corresponding concrete workability threshold, and determine the workability status of the concrete mixture based on the comparison result and according to the preset judgment criteria.

[0018] Furthermore, the preset determination criteria include:

[0019] If the deviation between the current stress value and the rotational angular acceleration of the mixing tank and the corresponding concrete workability threshold is within the preset range, the concrete workability is determined to be normal.

[0020] If the current stress value is greater than the first preset multiple of the concrete workability threshold, and the angular acceleration of the mixing tank is negative, then the concrete fluidity is determined to be worse than the preset state.

[0021] If the current stress value is less than the second preset multiple of the concrete workability threshold, and the angular acceleration of the mixing tank is positive, then the concrete fluidity is determined to be higher than the preset state.

[0022] Furthermore:

[0023] When the concrete is determined to be in normal working condition, the performance control unit is not activated.

[0024] When it is determined that the concrete fluidity is worse than the preset state, the performance control unit controls the spraying module to add water-reducing agent, increase the driving torque and increase the rotational speed of the mixing tank.

[0025] When the concrete fluidity is determined to be higher than the preset state, the performance control unit controls the spraying module to add thickener, reduce the driving torque, and reduce the rotational speed of the mixing tank.

[0026] Furthermore, the additives include water-reducing agents or thickeners.

[0027] On the other hand, the present invention provides a method for adjusting the workability of concrete in a concrete mixer truck, applied to the aforementioned device; the method includes the following steps:

[0028] S1. After the concrete mix is ​​loaded into the mixing tank of the truck, the central control module sends a command to the mixing tank drive device to drive the mixing tank to rotate at a preset angular velocity; the data recording module records the initial force value read by the concrete resistance detection unit, as well as the initial angular acceleration, angular velocity, and driving torque of the mixing tank as read by the mixing tank rotation resistance detection unit; the initial force value, initial angular acceleration, angular velocity, and driving torque are used as the concrete workability threshold.

[0029] S2. During tanker transportation, the rotational angular velocity of the mixing tank is read in real time by the rotation feature detection module and compared with the preset angular velocity; the main control module sends a command to the mixing tank drive device to adjust the drive torque according to the comparison result, so as to achieve a constant rotational angular velocity of the mixing tank.

[0030] S3. During the tanker transportation process, the concrete resistance detection unit and the mixing tank rotation resistance detection unit read the force update value and the mixing tank rotation angular acceleration update value at preset time intervals; the data recording module records the read data; the state identification module compares the currently read data with the corresponding concrete workability threshold, and determines the workability status of the concrete mixture based on the comparison result and preset judgment criteria.

[0031] S4. The performance control unit sends control commands to the mixing tank drive device and the spray module based on the judgment result of the state identification module.

[0032] S5. The concrete resistance detection unit and the mixing tank rotation resistance detection unit read the current force update value and the mixing tank rotation angular acceleration update value to verify the concrete workability control effect.

[0033] S6. Repeat steps S3 to S5 to ensure stable performance of the concrete mix during tanker transportation.

[0034] Further, in step S5:

[0035] If the current updated values ​​of stress and angular acceleration of the mixing tank are within the preset range of the corresponding concrete workability threshold, then the addition of water-reducing agent or thickener will be stopped, and the incremental drive torque will be reduced to zero, so that the angular acceleration of the mixing tank is zero and the angular velocity of the mixing tank remains constant.

[0036] If the current updated value of the force or the updated value of the angular acceleration of the mixing tank deviates from the corresponding concrete workability threshold by more than a preset range, the state identification module will re-determine the current workability status of the concrete mix, and the workability control unit will continue to control it based on the determination result.

[0037] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a method and device for controlling the workability of concrete in a concrete mixer truck, which has the following beneficial effects:

[0038] This invention provides a resistance determination method that integrates multiple parameters, including force value, angular acceleration of the mixing tank, angular velocity of the mixing tank, and driving torque. This method is more accurate and reliable than that based on a single parameter.

[0039] This invention continuously monitors changes in workability during concrete transportation and promptly detects anomalies. Furthermore, upon detecting a problem, the invention can immediately and automatically adjust through a workability control unit to ensure that the concrete has optimal workability upon arrival at the construction site. This avoids concrete scrapping due to substandard workability and reduces project costs.

[0040] This invention determines changes in concrete workability by comparing real-time values ​​with initial values, thereby informing the adjustment method. This approach avoids the need for large-scale databases and the problem of database model accuracy depending on the total amount of data. Furthermore, the concrete workability adjustment process employs an iterative, step-by-step approach, ensuring the accuracy of workability control.

[0041] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the concrete workability control device frame in a concrete mixer truck provided in an embodiment of the present invention.

[0044] Figure 2 This is a schematic diagram of the axial pressure sensor arrangement provided in an embodiment of the present invention.

[0045] Figure 3 This is a schematic diagram of the cross-sectional pressure sensor arrangement provided in an embodiment of the present invention.

[0046] Figure 4 This is a schematic diagram of the process for adjusting the workability of concrete in a concrete mixer truck according to an embodiment of the present invention. Detailed Implementation

[0047] 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 only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] Example 1:

[0049] This invention discloses a concrete workability control device in a concrete mixer truck, see [link to relevant documentation]. Figures 1 to 3 The device includes: a concrete resistance detection unit, a mixing tank rotation resistance detection unit, a data processing unit, and a performance control unit;

[0050] Next, each of these units will be explained in detail.

[0051] 1. Concrete resistance testing unit:

[0052] The concrete resistance detection unit includes multiple concrete resistance detection modules arranged on the inner wall of the mixing tank, used to read the force values ​​in the direction parallel to the intersection of the plane perpendicular to the rotation axis of the mixing tank; specifically:

[0053] Each concrete resistance detection module includes multiple tension-compression sensors and a rigid force transmission rod connected in series with the multiple tension-compression sensors. The multiple tension-compression sensors are evenly arranged circumferentially on the same plane perpendicular to the rotation axis of the mixing tank, and are used to read the force values ​​in the direction parallel to the tangent of the inner wall of the mixing tank, that is, the tension value and the compression value. The average value of the data read by the multiple tension-compression sensors in each concrete resistance detection module is used as the force value of the corresponding plane. The average value of the data read by multiple concrete resistance detection modules is not calculated again, so as to determine the concrete resistance at different locations inside the mixing tank.

[0054] The two ends of the rigid force transmission rod are hinged to the sensing ends of two tension-compression sensors to transmit tension and compression values.

[0055] For example, the concrete resistance detection unit includes 3-5 concrete resistance detection modules evenly arranged along the axial direction of the mixing tank's rotation axis. Each concrete resistance detection module includes 6-12 tension-compression sensors evenly arranged circumferentially along the plane; thus enabling accurate acquisition of the force value of the concrete mixture on the inner wall of the mixing tank.

[0056] In this embodiment of the invention, by connecting a rigid force transmission rod in series with a tension-compression sensor, the two sensors can be connected in series to test data synchronously. That is, during the rotation of the mixing tank, the friction force of the concrete on the rigid force transmission rod causes the sensors on both sides of the rigid force transmission rod to read the tension and compression values ​​respectively, and the average value of the tension and compression values ​​is used as the force value of the force transmission rod; while the average force of the rod cannot be tested by the pressure sensor alone.

[0057] 2. Mixing tank rotation resistance detection unit:

[0058] The mixing tank rotation resistance detection unit includes multiple rotation feature detection modules (e.g., 3-5) mounted on the mixing tank rotation shaft, as well as a torque sensor mounted on the mixing tank drive unit;

[0059] Each rotation feature detection module includes an angular acceleration sensor and an angular velocity sensor arranged at the same point on the rotation axis of the mixing tank; wherein, the angular acceleration sensor is used to read the rotation angular acceleration of the mixing tank; the angular velocity sensor is used to read the rotation angular velocity of the mixing tank; the average value of the rotation angular acceleration and rotation angular velocity of the mixing tank read by multiple rotation feature detection modules (e.g., 3-5) is taken as the final rotation angular acceleration and rotation angular velocity of the mixing tank;

[0060] The torque sensor is used to read the drive torque of the mixing tank drive unit.

[0061] 3. Data Processing Unit:

[0062] The data processing unit includes a data recording module and a state identification module; the data recording module is used to record the force value, the angular acceleration of the mixing tank, the angular velocity of the mixing tank, and the driving torque at preset time intervals; the state identification module is used to determine the workability state of the concrete mix based on the recorded data.

[0063] In this invention, the recording interval is set to a preset time interval of five to thirty minutes. However, if the recording interval is less than 5 minutes, the measurement frequency is too high, which wastes resources. If the recording interval is greater than 30 minutes, the concrete performance is likely to change significantly and cannot be adjusted in time.

[0064] 4. Performance control unit:

[0065] The work performance control unit includes a central control module and a spray module arranged inside the mixing tank. The central control module is used to receive the judgment results of the state identification module and send control commands to the mixing tank drive device and the spray module according to the judgment results. The spray module is used to store admixtures (including water-reducing agents or thickeners) that have the function of controlling the work performance of concrete and to add the admixtures into the concrete mix according to the instructions of the central control module.

[0066] Specifically: the mixing tank drive device adjusts the drive torque according to the instructions issued by the central control module to achieve a constant rotational angular velocity of the mixing tank; at this time, the state identification module is used to compare the current force value and the rotational angular acceleration of the mixing tank with the corresponding concrete workability threshold, and determine the workability status of the concrete mixture based on the comparison result and the preset judgment criteria.

[0067] The aforementioned pre-defined criteria include:

[0068] (1) If the current stress value and the angular acceleration of the mixing tank deviate from the corresponding concrete workability threshold within the preset range, the concrete workability is determined to be normal; at this time, the workability control unit is not activated.

[0069] For example, if the current stress value and the angular acceleration of the mixing tank deviate from the corresponding concrete workability threshold within ±5%, the concrete workability is determined to be normal. At this time, there is no need to adjust the concrete workability, and the workability control unit is not activated.

[0070] (2) If the current stress value is greater than the first preset multiple of the concrete workability threshold and the angular acceleration of the mixing tank is negative, the concrete fluidity is determined to be inferior to the preset state; at this time, the workability control unit controls the spray module to add water-reducing agent, increase the driving torque and increase the angular velocity of the mixing tank.

[0071] For example, if the current stress value is greater than 1.05 times the concrete workability threshold, that is, the circumferential force of the concrete mixture on the mixing tank increases to 1.05 times and the angular acceleration of the mixing tank is negative, the state identification module determines that the concrete fluidity has deteriorated, and the workability control unit controls the spraying module to add a quantitative water-reducing agent, increase the driving torque of the mixing tank and increase the angular velocity of the mixing tank.

[0072] (3) If the current stress value is less than the second preset multiple of the concrete workability threshold and the angular acceleration of the mixing tank is positive, it is determined that the concrete fluidity is higher than the preset state; at this time, the workability control unit controls the spray module to add thickener, reduce the driving torque and reduce the angular velocity of the mixing tank.

[0073] For example, if the current stress value is less than 0.95 times the concrete workability threshold, that is, the circumferential force of the concrete mixture on the mixing tank is reduced to 0.95 times and the angular acceleration of the mixing tank is positive, the state identification module determines that the concrete has too much fluidity, and the workability control unit controls the spraying module to add a quantitative thickener, reduce the driving torque of the mixing tank and reduce the angular velocity of the mixing tank.

[0074] (4) In (1)-(3) above, when the deviation between the preset number of stress values ​​and the concrete workability threshold is greater than the preset range, it is considered that the workability of the concrete mix has changed.

[0075] For example, when the updated concrete workability values ​​read by more than 65% of the concrete resistance detection modules deviate from the concrete workability threshold by more than 5%, it is considered that the workability of the concrete mix has changed.

[0076] During each adjustment process, the performance adjustment unit uploads the adjustment data to the data recording module, thereby fully recording the performance changes and adjustment history during transportation, which facilitates quality traceability.

[0077] Example 2:

[0078] This invention also provides a method for controlling the workability of concrete in a concrete mixer truck, applied to the concrete workability control device in the concrete mixer truck described in Embodiment 1 above. See [link to related documentation]. Figure 4 As shown, the method specifically includes:

[0079] S1. After the concrete mix is ​​loaded into the mixer truck's mixing tank, the central control module sends a command to the mixing tank's drive unit to drive the mixing tank to rotate at a preset angular velocity. The data recording module records the initial force value read by the concrete resistance detection unit, as well as the initial angular acceleration, angular velocity, and driving torque of the mixing tank as read by the mixing tank rotation resistance detection unit. The initial force value, initial angular acceleration, angular velocity, and driving torque are used as the threshold values ​​for the concrete's workability.

[0080] It should be noted here that the state of the concrete when it enters the mixing tank is the required final state. The purpose of all the control is to ensure that the concrete maintains its state when it enters the mixing tank during transportation. Therefore, the initial value is used as the threshold.

[0081] S2. During tanker transportation, the rotational angular velocity of the mixing tank is read in real time by the rotation feature detection module and compared with the preset angular velocity; the main control module sends a command to the mixing tank drive device to adjust the drive torque according to the comparison result, so as to achieve a constant rotational angular velocity of the mixing tank.

[0082] S3. During tanker transportation, the concrete resistance detection unit and the mixing tank rotation resistance detection unit read the updated values ​​of the force and the rotational angular acceleration of the mixing tank (i.e., the current force and the rotational angular acceleration of the mixing tank) at preset time intervals; the data recording module records the read data; the status identification module compares the currently read data with the corresponding concrete workability threshold, and determines the workability status of the concrete mixture based on the comparison results and preset judgment criteria.

[0083] During the aforementioned tanker transportation process, the rotational angular velocity of the mixing tank remained constant between two readings of the updated concrete workability values;

[0084] S4. The performance control unit sends control commands to the mixing tank drive device and the spray module based on the judgment result of the state identification module.

[0085] S5. The current stress update value and the current rotational angular acceleration update value of the mixing tank are read by the concrete resistance detection unit and the mixing tank rotation resistance detection unit to verify the effect of concrete workability control; specifically:

[0086] (1) If the current force update value and the angular acceleration update value of the mixing tank are both within the preset range of the corresponding concrete workability threshold, then stop adding water-reducing agent or thickener, and reduce the driving torque increment to zero, so that the angular acceleration of the mixing tank is zero and the angular velocity of the mixing tank remains constant.

[0087] For example, if the updated value recovers to within ±5% of the concrete workability threshold deviation, then stop adding water-reducing agent or thickener, and slowly reduce the increase in the driving torque of the mixing tank to zero, so that the angular acceleration of the mixing tank is zero, and keep the angular velocity of the mixing tank constant.

[0088] (2) If the current force update value or the angular acceleration update value of the mixing tank is more than the preset range of the corresponding concrete workability threshold, the state identification module will re-determine the current workability status of the concrete mix, and the workability control unit will continue to control it according to the determination result.

[0089] For example, if the updated value still deviates from the concrete workability threshold by more than ±5%, the status identification module will re-determine the current workability status of the concrete mix, and the workability control unit will continue to control it based on the determination result.

[0090] The water-reducing agent or thickener added to the above-mentioned spray module is a single quantitative addition. The amount added is adjusted linearly based on the deviation between the updated value of concrete workability and the threshold value of concrete workability.

[0091] S6. Repeat steps S3 to S5 to ensure stable performance of the concrete mix during tanker transportation.

[0092] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The methods disclosed in the embodiments are described simply because they correspond to the apparatus disclosed in the embodiments; relevant details can be found in the method section.

[0093] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A concrete workability control device for a concrete mixer truck, characterized in that, include: Concrete resistance detection unit, mixing tank rotation resistance detection unit, data processing unit and performance control unit; The concrete resistance detection unit includes multiple concrete resistance detection modules arranged on the inner wall of the mixing tank, used to read the force value in the direction parallel to the intersection of the inner wall of the mixing tank and the plane perpendicular to the rotation axis of the mixing tank. The mixing tank rotation resistance detection unit includes multiple rotation feature detection modules installed on the mixing tank rotation shaft for reading the mixing tank rotation angular acceleration and rotation angular velocity; and a torque sensor installed on the mixing tank drive device for reading the drive torque of the mixing tank drive device. The data processing unit includes a data recording module and a state identification module; the data recording module is used to record the force value, the angular acceleration of the mixing tank, the angular velocity of the mixing tank, and the driving torque at preset time intervals; the state identification module is used to determine the workability state of the concrete mix based on the recorded data; The performance control unit includes a central control module and a spraying module arranged inside the mixing tank. The central control module is used to receive the judgment result of the state identification module and issue control commands to the mixing tank drive device and the spraying module according to the judgment result. The spraying module is used to store admixtures with the function of controlling the workability of concrete and to add the admixtures into the concrete mixture according to the command of the central control module.

2. The concrete workability control device in a concrete mixer truck according to claim 1, characterized in that, Each of the concrete resistance detection modules includes multiple tension-compression sensors and a rigid force transmission rod connected in series with the multiple tension-compression sensors; Multiple tension-compression sensors are evenly arranged circumferentially on the same plane perpendicular to the rotation axis of the mixing tank. They are used to read the tension and compression values ​​in the direction parallel to the tangent of the inner wall of the mixing tank, and the average value of the data read by multiple tension-compression sensors in each concrete resistance detection module is used as the force value of the corresponding plane. The two ends of the rigid force transmission rod are respectively hinged to the sensing ends of two tension-compression sensors to transmit the tension and compression values.

3. The concrete workability control device in a concrete mixer truck according to claim 1, characterized in that, Each of the rotation feature detection modules includes an angular acceleration sensor and an angular velocity sensor arranged at the same point on the rotation axis of the mixing tank; the angular acceleration sensor is used to read the rotational angular acceleration of the mixing tank; the angular velocity sensor is used to read the rotational angular velocity of the mixing tank.

4. The concrete workability control device in a concrete mixer truck according to claim 1, characterized in that, The preset time interval for data recording by the data recording module is five to thirty minutes.

5. The concrete workability control device in a concrete mixer truck according to claim 1, characterized in that, The mixing tank drive device adjusts the drive torque according to the instructions issued by the central control module to achieve a constant angular velocity of the mixing tank rotation. At this time, the state identification module is used to compare the current force value and the angular acceleration of the mixing tank rotation with the corresponding concrete workability threshold, and to determine the workability status of the concrete mixture based on the comparison result and a preset judgment criterion.

6. The concrete workability control device in a concrete mixer truck according to claim 5, characterized in that, The preset determination criteria include: If the deviation between the current stress value and the rotational angular acceleration of the mixing tank and the corresponding concrete workability threshold is within the preset range, the concrete workability is determined to be normal. If the current stress value is greater than the first preset multiple of the concrete workability threshold, and the angular acceleration of the mixing tank is negative, then the concrete fluidity is determined to be worse than the preset state. If the current stress value is less than the second preset multiple of the concrete workability threshold, and the angular acceleration of the mixing tank is positive, then the concrete fluidity is determined to be higher than the preset state.

7. The concrete workability control device in a concrete mixer truck according to claim 6, characterized in that: When the concrete is determined to be in normal working condition, the performance control unit is not activated. When it is determined that the concrete fluidity is worse than the preset state, the performance control unit controls the spraying module to add water-reducing agent, increase the driving torque and increase the rotational speed of the mixing tank. When the concrete fluidity is determined to be higher than the preset state, the performance control unit controls the spraying module to add thickener, reduce the driving torque, and reduce the rotational speed of the mixing tank.

8. The concrete workability control device in a concrete mixer truck according to claim 1, characterized in that, The additives include water-reducing agents or thickeners.

9. A method for controlling the workability of concrete in a concrete mixer truck, characterized in that, Applied to the apparatus according to any one of claims 1-8; the method comprises the following steps: S1. After the concrete mix is ​​loaded into the mixing tank of the truck, the central control module sends a command to the mixing tank drive device to drive the mixing tank to rotate at a preset angular velocity; the data recording module records the initial force value read by the concrete resistance detection unit, as well as the initial angular acceleration, angular velocity, and driving torque of the mixing tank as read by the mixing tank rotation resistance detection unit; the initial force value, initial angular acceleration, angular velocity, and driving torque are used as the concrete workability threshold. S2. During tanker transportation, the rotational angular velocity of the mixing tank is read in real time by the rotation feature detection module and compared with the preset angular velocity; the main control module sends a command to the mixing tank drive device to adjust the drive torque according to the comparison result, so as to achieve a constant rotational angular velocity of the mixing tank. S3. During tanker transportation, the concrete resistance detection unit and the mixing tank rotation resistance detection unit read the updated force value and the updated rotational angular acceleration value of the mixing tank at preset time intervals; the data recording module records the read data. The status identification module compares the currently read data with the corresponding concrete workability threshold, and determines the workability status of the concrete mix based on the comparison result and preset judgment criteria. S4. The performance control unit sends control commands to the mixing tank drive device and the spray module for control based on the judgment result of the state identification module. S5. The concrete resistance detection unit and the mixing tank rotation resistance detection unit read the current force update value and the mixing tank rotation angular acceleration update value to verify the concrete workability control effect. S6. Repeat steps S3 to S5 to ensure stable performance of the concrete mix during tanker transportation.

10. A method for controlling the workability of concrete in a concrete mixer truck according to claim 9, characterized in that, In step S5: If the current updated values ​​of stress and angular acceleration of the mixing tank are within the preset range of the corresponding concrete workability threshold, then the addition of water-reducing agent or thickener will be stopped, and the incremental drive torque will be reduced to zero, so that the angular acceleration of the mixing tank is zero and the angular velocity of the mixing tank remains constant. If the current updated value of the force or the updated value of the angular acceleration of the mixing tank deviates from the corresponding concrete workability threshold by more than a preset range, the state identification module will re-determine the current workability status of the concrete mix, and the workability control unit will continue to control it based on the determination result.

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