A dynamic control method and system for foamed asphalt mixture

Abstract

The present invention discloses a dynamic control method and system for foamed asphalt mixture, which includes: collecting operating parameters of a cold regeneration machine, including milling speed, milling depth, milling width and milling rotor speed data; based on the collected operating parameters of the cold regeneration machine, matching the mix ratio database to obtain optimal foaming process parameters, and outputting the optimal foaming process parameters; the process parameters include asphalt quantity, foaming water quantity, and foaming temperature; transmitting the optimal foaming process parameters to an asphalt flow control system, a foaming water quantity control system, and a foaming temperature control system, respectively, to respectively adjust the asphalt flow, foaming water flow and foaming temperature to achieve corresponding target values of asphalt quantity, foaming water quantity and foaming temperature.

Description

Technical Field

[0001] The present invention belongs to the technical field of road construction machinery, in particular to foamed asphalt in-situ cold regeneration construction machinery, and particularly relates to a dynamic control system for foamed asphalt mixture proportion, and also relates to a dynamic control method for foamed asphalt mixture proportion. Background Art

[0002] Foamed asphalt cold recycling is one of the commonly used technologies for cold recycling of asphalt road materials. It is a green and environmentally friendly road maintenance process that has been widely used in the field of road maintenance. Foamed asphalt cold recycling is achieved by milling asphalt concrete waste on-site, spraying a certain proportion of foamed asphalt into the asphalt mixture, and then compacting it into shape. The quality of the asphalt mixture directly determines the road performance of the cold recycled pavement. At present, the asphalt mixture is mainly prepared by milling a certain amount of asphalt concrete waste in the test section using an asphalt cold regeneration machine. The asphalt mixture ratio is designed in the laboratory, and the foamed asphalt mixture test blocks are prepared using test equipment. Based on the mechanical and road performance of the test blocks, a single foamed asphalt construction parameter is selected as the cold recycling construction parameter.

[0003] For example, patent CN108570907, a prior art publication, proposes a foamed asphalt cold-recycling construction method. It selects fine, medium, and coarse graded aggregates to achieve optimal moisture content and foaming parameters. Specimens are prepared using a rotary compaction method, and the optimal foaming process is selected based on the dry-wet splitting strength ratio and freeze-thaw splitting strength ratio. Patent CN107540274 discloses a foamed asphalt cold-recycling mixture design method based on internal friction angle and cohesion. Using the asphalt internal friction angle as an evaluation metric, it selects asphalt waste materials, while using cohesion as an evaluation metric to select optimal foaming conditions.

[0004] It can be seen that both patents CN108570907 and CN107540274 select a certain amount of asphalt waste according to certain principles in a test section, then use laboratory equipment to design the asphalt mixture mix ratio. The final optimized mix ratio parameters are used as the construction parameters of the cold recycler, which are solidified throughout the entire construction process. Because the mix quality of the asphalt mixture is closely related to the parameters of the cold recycler construction equipment itself, such as milling speed and milling width, the disclosed patents are all small-sample laboratory static test methods, which cannot fully and accurately reflect the quality of the asphalt mixture mix design.

[0005] Because the quality of asphalt mixture mixes depends not only on foamed asphalt parameters but also on the milling parameters of the cold recycler, such as milling speed, milling depth, and milling rotor speed, it is difficult to accurately control the mix quality of asphalt mixtures simply by relying on the foamed asphalt construction parameters solidified by laboratory mix design. In view of this, the present invention discloses a dynamic control system for foamed asphalt mixtures. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method and system for dynamic control of foamed asphalt mixture to achieve automatic matching of asphalt mixture proportions with cold regeneration construction operation parameters.

[0007] To solve the above technical problems, the present invention provides a method for dynamic control of foamed asphalt mixture, comprising:

[0008] Collect cold recycler operating parameters, including milling speed, milling depth, milling width and milling rotor speed data;

[0009] Based on the collected cold regeneration machine operating parameters, the optimal foaming process parameters are matched with the mix ratio database and output; the optimal foaming process parameters include asphalt amount, foaming water amount, and foaming temperature;

[0010] The optimal foaming process parameters are transmitted to the asphalt flow control system, foaming water control system, and foaming temperature control system respectively, so as to adjust the asphalt flow, foaming water flow, and foaming temperature respectively to achieve the corresponding asphalt amount, foaming water amount, and foaming temperature target values.

[0011] Furthermore, the optimal target values of asphalt foaming process parameters matching various cold regeneration machine operating parameters are stored in the mix ratio database.

[0012] A dynamic control system for foamed asphalt mixture, comprising: an input module, a control module, a mix ratio database and an output module; wherein:

[0013] An input module is used to collect operating parameters of the cold recycler, including milling speed, milling depth, milling width and milling rotor speed data;

[0014] A mix ratio database is used to store the optimal target values of asphalt foaming process parameters matching various cold regeneration machine operating parameters, including asphalt amount, foaming water amount, and foaming temperature;

[0015] The control module is used to match the mix ratio database based on the collected cold regeneration machine operating parameters to obtain the optimal foaming process parameters and output the optimal foaming process parameters;

[0016] The output module is used to transmit the optimal foaming process parameters to the asphalt flow control system, foaming water flow control system, and foaming temperature control system respectively, so as to adjust the asphalt flow, foaming water flow, and foaming temperature respectively to achieve the corresponding asphalt amount, foaming water amount, and foaming temperature target values.

[0017] Furthermore, the asphalt flow control system includes: an asphalt pump, an asphalt motor, an asphalt flow sensor, and a first converter;

[0018] The first converter is connected to the asphalt flow sensor and is used to convert the current and voltage analog signals output by the asphalt flow sensor into actual asphalt flow;

[0019] The asphalt motor receives a speed control signal, controls the speed of the asphalt motor according to the speed control signal, and then controls the amount of asphalt in the asphalt pump through the asphalt motor;

[0020] The speed control signal is a signal obtained by comparing the flow data of the asphalt pump fed back to the control module by the asphalt flow sensor in real time with the asphalt amount set value. The asphalt amount set value is given by the control module calling the mix ratio database.

[0021] Furthermore, the asphalt flow control system includes: an asphalt pump, an asphalt motor, an asphalt pump speed sensor, and a second converter;

[0022] The second converter is connected to the asphalt pump speed sensor and is used to convert the asphalt pump speed output by the asphalt pump speed sensor into an actual asphalt flow rate; the actual asphalt flow rate = asphalt pump speed * asphalt pump displacement, where the displacement is a constant value;

[0023] The asphalt motor receives a speed control signal, controls the speed of the asphalt motor according to the speed control signal, and then controls the amount of asphalt in the asphalt pump through the asphalt motor;

[0024] The speed control signal is a signal obtained by comparing the flow data of the asphalt pump fed back to the control module by the asphalt pump speed sensor in real time with the asphalt amount set value. The asphalt amount set value is given by the control module calling the mix ratio database.

[0025] Furthermore, the signal obtained by comparing the flow data of the asphalt pump fed back to the control module by the asphalt flow sensor in real time with the asphalt amount set value includes:

[0026] If the flow data of the asphalt pump is greater than the asphalt amount setting value, a signal to reduce the asphalt motor speed is output; if the flow data of the asphalt pump is less than the asphalt amount setting value, a signal to increase the asphalt motor speed is output; if the flow data of the asphalt pump is equal to the asphalt amount setting value, no signal is output.

[0027] Furthermore, the foaming water control system includes: a proportional solenoid valve, a water pump, a water supply motor, a foaming water flow sensor, and a third converter;

[0028] The third converter is connected to the foaming water flow sensor and is used to convert the current and voltage analog signals output by the foaming water flow sensor into actual water flow;

[0029] The proportional solenoid valve receives a solenoid valve control signal, controls the output of the proportional solenoid valve according to the solenoid valve control signal, and thereby controls the speed of the water supply motor, and then controls the water flow of the water pump through the water supply motor;

[0030] The solenoid valve control signal is a signal obtained by comparing the flow data of the water pump fed back to the control module by the foaming water flow sensor in real time with the foaming water volume set value. The foaming water volume set value is given by the control module calling the mix ratio database.

[0031] Furthermore, the signal obtained by comparing the flow data of the water pump fed back to the control module by the foaming water flow sensor in real time with the foaming water volume set value includes:

[0032] If the flow data of the water pump is greater than the set value of the foaming water volume, the output signal controls the proportional solenoid valve to reduce the speed of the asphalt motor. If the flow data of the water pump is less than the set value of the foaming water volume, the output signal controls the proportional solenoid valve to increase the speed of the asphalt motor. If the flow data of the water pump is equal to the set value of the foaming water volume, no signal is output.

[0033] Furthermore, the foaming temperature control system includes a PID controller, a heating output module, a temperature sensor, and a converter;

[0034] The temperature sensor collects the temperature data of the heating output module and transmits the temperature data as the temperature feedback value to the PID controller through the converter;

[0035] The PID controller calculates the temperature error value in real time according to the foaming temperature set value and the temperature feedback value, and controls the on and off of the heating output module according to the temperature error value, thereby controlling the foaming temperature. The foaming temperature set value is given by the control module calling the mix ratio database.

[0036] Furthermore, controlling the on / off of the heating output module according to the temperature error value includes:

[0037] If the temperature feedback value is greater than the foaming temperature set value, the PID controller will start the heating output module to increase the temperature. If the temperature feedback value is less than the foaming temperature set value, the PID controller will disconnect the heating output module to reduce the temperature. If the temperature feedback value is equal to the foaming temperature set value, the PID controller will keep the control of the heating output module unchanged.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] Real-time monitoring of cold recycling machine operating parameters, matching of foamed asphalt mix ratio database, calling of optimal foaming process parameter target values, control of asphalt quantity, foaming water quantity, and foaming temperature, automatic adjustment and control of foamed asphalt mix ratio parameters, automatic matching of asphalt mixture mix ratio with cold recycling operation parameters, and improvement of the stability of recycling construction operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a dynamic control scheme for foamed asphalt asphalt mixture;

[0041] Figure 2 It is composed of a dynamic control system for foamed asphalt to produce asphalt mixture;

[0042] Figure 3 Asphalt flow control system structure Figure 1 ;

[0043] Figure 4 Asphalt flow control system structure Figure 2 ;

[0044] Figure 5 This is the structural diagram of the foaming water control system;

[0045] Figure 6 This is the structural diagram of the foaming temperature control system;

[0046] Figure 7 Flowchart of the dynamic control scheme for foamed asphalt asphalt mixture. DETAILED DESCRIPTION

[0047] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0048] The present invention provides a dynamic control system for foamed asphalt mixture, which is composed of the following components: Figure 2 As shown, it consists of input module, control module, mix ratio database and output module.

[0049] The input module includes: milling speed sensor, milling depth sensor, milling width sensor, milling rotor speed sensor to collect milling speed, milling depth, milling width, and milling rotor speed data. The sensor output signal can be current, voltage, frequency and other signals. The output signal of the input module is connected to the control module through a communication cable to provide real-time feedback of the cold regeneration machine operating parameters to the control module.

[0050] The mix ratio database is responsible for storing the cold regeneration machine mix ratio design parameters. These design parameters are obtained in the laboratory by obtaining the optimal target values for asphalt foaming process parameters for each combination of parameters, such as asphalt quantity, foaming water volume, and foaming temperature, while milling waste asphalt under orthogonal combinations of milling speed, milling width, milling depth, and rotor speed. This creates a relationship table between cold regeneration operation parameters and foaming process parameters. The mix ratio database is connected to the control module via serial communication or stored in the storage and control module, making it available to the control module for real-time access.

[0051] The control module monitors the operating parameters of the cold regeneration machine in real time, including milling speed, milling depth, milling width, and milling rotor speed, matches the foamed asphalt mix ratio database, calls the optimal foaming process parameters, controls the asphalt amount, foaming water amount, and foaming temperature, and realizes automatic adjustment and control of the foamed asphalt mix ratio parameters.

[0052] The output module receives the output signal of the control module, controls the asphalt amount, foaming water amount, and foaming temperature, and is connected to the control module via a communication cable or communication protocol.

[0053] The present invention is a control method for a dynamic control system of foamed asphalt asphalt mixture, see Figure 1 As shown,

[0054] The control method is: first collect the cold recycling operation parameters, and then call the mix ratio database through the control module. Use the cold recycling operation parameter-foaming process parameter relationship table stored in the database to control the asphalt flow, foaming water volume, and foaming temperature, thus realizing the real-time dynamic control and adjustment of cold recycled asphalt asphalt mixture. For the specific process, see Figure 7 As shown. Includes:

[0055] 1) Asphalt quantity control: Modified to: The asphalt quantity control system includes an asphalt pump, an asphalt motor, an asphalt pump, an asphalt flow sensor, and a converter. The converter is connected to the asphalt flow sensor and is used to convert the analog signals such as current and voltage output by the asphalt flow sensor into actual asphalt flow. The asphalt quantity set value is determined by the control module by calling the mix ratio database. The asphalt flow control method is as follows: the asphalt flow sensor feeds the asphalt pump flow data back to the control module in real time and compares it with the asphalt quantity set value. Based on the comparison result, the asphalt motor speed is controlled, and then the asphalt quantity of the asphalt pump is controlled to ensure the stability of the asphalt quantity, such as Figure 3 As shown. Figure 4 As shown, the asphalt flow rate can also be calculated by the speed detected by the asphalt pump speed sensor and the displacement of the asphalt pump. The asphalt pump speed sensor is used to detect the speed of the asphalt pump. The actual asphalt flow rate = asphalt pump speed * asphalt pump displacement (displacement is a constant value, the unit is liter / speed).

[0056] 2) Foaming water volume control: The foaming water volume setting value is given by the control module calling the mix ratio database. The water volume control system consists of a proportional solenoid valve, a water pump, a water supply motor, a foaming water flow sensor, and a converter. The converter is connected to the foaming water flow sensor and is used to convert the analog signals such as current and voltage output by the foaming water flow sensor into actual water flow; Foaming water volume control: The foaming water volume setting value is given by the control module calling the mix ratio database. The water flow sensor feeds the water pump flow data back to the control module in real time and compares it with the set calculated water volume. Based on the comparison result, the proportional solenoid valve output is controlled to control the water supply motor speed, and the water output flow of the water pump is controlled to ensure the stability of the water volume. Figure 5 shown.

[0057] 3) Foaming temperature control: The foaming temperature setting value is given by the control module calling the mix ratio database. The foaming temperature control system consists of a thermostat, heating output, temperature sensor, and PT100 converter. The thermostat contains a PID controller to realize real-time calculation of the temperature error value and control the on and off of the heating output component. Foaming temperature control method: The temperature sensor feeds back the temperature data of the heating output and the set foaming temperature value to the PID controller in real time through the PT100 converter and compares them. The heating output is controlled according to the comparison result, thereby ensuring the stability of the foaming temperature. Figure 6 shown.

[0058] The asphalt mixture dynamic control system can be implemented on fixed, vehicle-mounted, mobile cold recyclers, plant mixing stations and other carriers, but is not limited to the above carriers.

[0059] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0060] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0061] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0062] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0063] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for dynamic control of foamed asphalt mixture, characterized in that: include: Collect cold recycler operating parameters, including milling speed, milling depth, milling width and milling rotor speed data; Based on the collected cold regeneration machine operating parameters, the optimal foaming process parameters are matched with the mix ratio database and output; the optimal foaming process parameters include asphalt amount, foaming water amount, and foaming temperature; The optimal foaming process parameters are transmitted to the asphalt flow control system, foaming water flow control system, and foaming temperature control system respectively, so as to adjust the asphalt flow, foaming water flow, and foaming temperature respectively to achieve the corresponding asphalt amount, foaming water amount, and foaming temperature target values; The asphalt flow control system includes: an asphalt pump, an asphalt motor, an asphalt flow sensor, and a first converter; The first converter is connected to the asphalt flow sensor and is used to convert the current and voltage analog signals output by the asphalt flow sensor into actual asphalt flow; The asphalt motor receives a speed control signal, controls the speed of the asphalt motor according to the speed control signal, and then controls the amount of asphalt in the asphalt pump through the asphalt motor; The speed control signal is a signal obtained by comparing the flow data of the asphalt pump fed back to the control module by the asphalt flow sensor in real time with the asphalt amount set value. The asphalt amount set value is given by the control module calling the mix ratio database.

2. The method for dynamic control of foamed asphalt mixture according to claim 1, characterized in that: The optimal asphalt foaming process parameter target values matched under various cold regeneration machine operating parameters are stored in the mix ratio database.

3. A dynamic control system for foamed asphalt mixture, characterized in that: include: Input module, control module, mix ratio database and output module; among them: An input module is used to collect operating parameters of the cold recycler, including milling speed, milling depth, milling width and milling rotor speed data; A mix ratio database is used to store the optimal target values of asphalt foaming process parameters matching various cold regeneration machine operating parameters, including asphalt amount, foaming water amount, and foaming temperature; The control module is used to match the mix ratio database based on the collected cold regeneration machine operating parameters to obtain the optimal foaming process parameters and output the optimal foaming process parameters; The output module is used to transmit the optimal foaming process parameters to the asphalt flow control system, foaming water flow control system, and foaming temperature control system respectively, so as to adjust the asphalt flow, foaming water flow, and foaming temperature respectively to achieve the corresponding asphalt amount, foaming water amount, and foaming temperature target values.

4. The dynamic control system for foamed asphalt mixture according to claim 3, characterized in that: The asphalt flow control system includes: an asphalt pump, an asphalt motor, an asphalt flow sensor, and a first converter; The first converter is connected to the asphalt flow sensor and is used to convert the current and voltage analog signals output by the asphalt flow sensor into actual asphalt flow; The asphalt motor receives a speed control signal, controls the speed of the asphalt motor according to the speed control signal, and then controls the amount of asphalt in the asphalt pump through the asphalt motor; The speed control signal is a signal obtained by comparing the flow data of the asphalt pump fed back to the control module by the asphalt flow sensor in real time with the asphalt amount set value. The asphalt amount set value is given by the control module calling the mix ratio database.

5. The dynamic control system for foamed asphalt mixture according to claim 3, characterized in that: The asphalt flow control system includes: an asphalt pump, an asphalt motor, an asphalt pump speed sensor, and a second converter; The second converter is connected to the asphalt pump speed sensor and is used to convert the asphalt pump speed output by the asphalt pump speed sensor into an actual asphalt flow rate; the actual asphalt flow rate = asphalt pump speed * asphalt pump displacement, where the displacement is a constant value; The asphalt motor receives a speed control signal, controls the speed of the asphalt motor according to the speed control signal, and then controls the amount of asphalt in the asphalt pump through the asphalt motor; The speed control signal is a signal obtained by comparing the flow data of the asphalt pump fed back to the control module by the asphalt pump speed sensor in real time with the asphalt amount set value. The asphalt amount set value is given by the control module calling the mix ratio database.

6. The dynamic control system for foamed asphalt mixture according to any one of claims 4-5, characterized in that: The signal obtained by comparing the flow data of the asphalt pump fed back to the control module by the asphalt flow sensor in real time with the asphalt amount set value includes: If the flow data of the asphalt pump is greater than the asphalt amount setting value, a signal to reduce the asphalt motor speed is output; if the flow data of the asphalt pump is less than the asphalt amount setting value, a signal to increase the asphalt motor speed is output; if the flow data of the asphalt pump is equal to the asphalt amount setting value, no signal is output.

7. The dynamic control system for foamed asphalt mixture according to claim 3, characterized in that: The foaming water control system includes: a proportional solenoid valve, a water pump, a water supply motor, a foaming water flow sensor, and a third converter; The third converter is connected to the foaming water flow sensor and is used to convert the current and voltage analog signals output by the foaming water flow sensor into actual water flow; The proportional solenoid valve receives a solenoid valve control signal, controls the output of the proportional solenoid valve according to the solenoid valve control signal, and thereby controls the speed of the water supply motor, and then controls the water flow of the water pump through the water supply motor; The solenoid valve control signal is a signal obtained by comparing the flow data of the water pump fed back to the control module by the foaming water flow sensor in real time with the foaming water volume set value. The foaming water volume set value is given by the control module calling the mix ratio database.

8. The dynamic control system for foamed asphalt mixture according to claim 7, characterized in that: The signal obtained by comparing the flow data of the water pump fed back to the control module by the foaming water flow sensor in real time with the foaming water volume set value includes: If the flow data of the water pump is greater than the set value of the foaming water volume, the output signal controls the proportional solenoid valve to reduce the speed of the asphalt motor. If the flow data of the water pump is less than the set value of the foaming water volume, the output signal controls the proportional solenoid valve to increase the speed of the asphalt motor. If the flow data of the water pump is equal to the set value of the foaming water volume, no signal is output.

9. The dynamic control system for foamed asphalt mixture according to claim 3, characterized in that: The foaming temperature control system includes a PID controller, a heating output module, a temperature sensor, and a converter; The temperature sensor collects the temperature data of the heating output module and transmits the temperature data as the temperature feedback value to the PID controller through the converter; The PID controller calculates the temperature error value in real time according to the foaming temperature set value and the temperature feedback value, and controls the on and off of the heating output module according to the temperature error value, thereby controlling the foaming temperature. The foaming temperature set value is given by the control module calling the mix ratio database.

10. The dynamic control system for foamed asphalt mixture according to claim 9, characterized in that: Control the on / off of the heating output module according to the temperature error value, including: If the temperature feedback value is greater than the foaming temperature set value, the PID controller will start the heating output module to increase the temperature. If the temperature feedback value is less than the foaming temperature set value, the PID controller will disconnect the heating output module to reduce the temperature. If the temperature feedback value is equal to the foaming temperature set value, the PID controller will keep the control of the heating output module unchanged.

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