Hot asphalt and regenerant mixing and adding system

Abstract

The invention discloses a hot asphalt and regenerant mixing and adding system, and relates to the technical field of hot in-place recycling of asphalt pavements. The device has the functions of heat preservation, heating, adding and stirring, constant-temperature conveying and quantitative and equivalent distribution and spreading of the centrifugal plates, quantitative and equivalent distribution and spreading can be achieved through reasonable arrangement of the parallel centrifugal plates, and spreading uniformity can be achieved. Comprising a hot asphalt storage box assembly used for supplying hot asphalt, a regenerant storage box assembly used for supplying a regenerant and a heat preservation heating adding and stirring device assembly used for mixing and stirring. The device further comprises a constant-temperature conveying device assembly, a quantitative and equivalent distribution assembly, a purging and clearing assembly and a data acquisition and monitoring control system. According to the scheme, hot asphalt and a regenerant are proportionally added, continuous heating and stirring are carried out in the heat preservation, heating, adding and stirring device, conveying, heating, stirring and heat preservation are automatically started and stopped by the data acquisition and monitoring control system, and heat preservation, heating, adding and stirring, constant-temperature conveying and quantitative and equivalent distribution and spreading of a centrifugal disc are realized by adapting to various working condition requirements.

Description

Technical Field

[0001] This invention relates to the field of in-situ hot recycling technology for asphalt pavement, specifically to a core technology for improving the accuracy and uniformity of hot asphalt and recycling agent addition and enhancing the quality of asphalt pavement during continuous construction operations of in-situ hot recycling. Background Technology

[0002] With the rapid development of technology, the mileage of asphalt-paved roads has increased rapidly. Currently, the total length of asphalt-paved roads has reached over 5.4 million kilometers, including 360,000 kilometers of expressways. The ever-increasing traffic volume and the pressure from heavy vehicles put significant strain on these roads. Most asphalt pavements in China currently suffer from varying degrees of damage and road defects. Some pavements have been neglected for years, with missing asphalt and severely aged surfaces. The main current solution is to mill off the surface layer and repave it, which results in significant waste. Another approach is to use in-situ hot recycling technology, adding hot asphalt and a recycling agent. This involves adding hot asphalt to compensate for missing asphalt and adding the recycling agent to improve the solubility of asphalt, enhance its compatibility, penetration, and ductility, restoring the asphalt to or near its original properties. This method saves resources and ensures the sustainable use of the road surface. The accuracy and uniformity of the addition of hot asphalt and recycling agent mixtures are among the core technologies for in-situ hot recycling of asphalt pavements. A common method is to directly spray the recycling agent and hot asphalt onto the asphalt pavement, but the accuracy and uniformity of the addition of these components cannot be controlled. In in-situ hot recycling of asphalt pavements, adding missing asphalt and recycling agents to rejuvenate aged asphalt is a crucial technical step. Ensuring the effective integration of the recycling agent and aged asphalt, the accuracy and uniformity of the addition amount, and maintaining the quality of the process—including heated mixing, constant-temperature conveying, and quantitative application of the hot asphalt and recycling agent mixture using centrifugal discs—are the key technical challenges of this project.

[0003] The existing hot asphalt and recycling agent addition technology for shaping and hot recycling construction mainly has the following obvious technical problems: First, in hot recycling, emulsified asphalt is sprayed onto the road surface manually using a handheld spray gun. Hot asphalt cannot be added because its high temperature poses a risk of burns, and the amount added manually is uncontrollable and the spraying is uneven. Second, when adding recycling agents in hot recycling, existing published technologies use nozzle atomization for spraying. This is easily dispersed by wind, resulting in uneven spraying; the nozzles are also prone to clogging, leading to excessive spray volume and difficulty in controlling accuracy. The reason is that the recycling agent only needs to restore a thin layer of asphalt to the road surface, requiring a relatively small amount of agent.

[0004] Secondly, the existing technology for mixing hot asphalt and recycling agents is inaccurate in terms of mixing ratio and temperature control. Current heating technologies employ a method of heating and insulating the entire storage tank, requiring several cubic meters of hot asphalt and recycling agents daily for construction. Heating the large-capacity storage tank to the required temperature takes a long time and necessitates significant insulation, resulting in high heat consumption, significant heat loss from the tank itself, and rapid heat dissipation during transport. This fails to achieve a constant temperature transport effect, easily clogging nozzles, and causing the asphalt and recycling agents to solidify upon reaching the road surface due to lower temperatures, leading to uneven road surface coverage. Summary of the Invention

[0005] To address the above problems, this invention proposes a hot asphalt and recycling agent mixing and adding system, which has the functions of heat preservation heating and mixing, constant temperature conveying, and quantitative equal distribution spreading by centrifugal discs. By using the reasonable arrangement of parallel centrifugal discs, quantitative equal distribution spreading can be achieved, and uniform spreading can be achieved.

[0006] The technical solution of the present invention includes a hot asphalt storage tank assembly 1 for supplying hot asphalt, a recycling agent storage tank assembly 2 for supplying recycling agent, and a heat-insulating, heating, adding, and stirring device assembly 3 for mixing and stirring. The heat-insulating, heating, and stirring device assembly 3 includes, from the outside to the inside, a heat-insulating layer 301, a hot air layer 302, and a heat-conducting oil heat transfer layer 303. The heat-conducting oil heat transfer layer 303 is fixedly disposed on the upper part of the heat-insulating layer 301, and the hollow interior of the heat-conducting oil heat transfer layer 303 is filled with heat-conducting oil. The area inside the heat-conducting oil heat transfer layer 303 is the mixing area, and the area below the heat-conducting oil heat transfer layer 303 is the heat source inlet area. A stirring shaft 315 is installed in the mixing area, and a power source for the stirring shaft 315 is provided outside the heat-insulating layer 301. The top of the insulation layer 301 is also provided with a hot asphalt inlet pipe 319 and a recycling agent inlet pipe 320 that lead into the mixing zone of the mixture. The hot asphalt inlet pipe 319 is connected to the hot asphalt storage tank assembly 1, and the recycling agent inlet pipe 320 is connected to the recycling agent storage tank assembly 2. The insulation layer 301 also has an outlet pipe 312 on its side wall that leads to the bottom of the mixing zone of the hot asphalt and recycling agent mixture.

[0007] Furthermore, the heat preservation, heating, and stirring device assembly 3 also includes a heat transfer oil overflow vent pipe 304, a heat transfer oil unloading pipe 305, and a mixed liquid discharge pipe 306. The heat transfer oil overflow vent pipe 304 penetrates into the hollow interior of the heat transfer oil heat transfer layer 303, and its top opening is higher than the liquid level of the heat transfer oil. The heat transfer oil unloading pipe 305 penetrates into the hollow interior of the heat transfer oil heat transfer layer 303, and its top opening is at the bottom of the liquid level of the heat transfer oil. A heat transfer oil unloading valve 307 is installed on the heat transfer oil unloading pipe 305. The mixed liquid discharge pipe 306 penetrates from bottom to top into the bottom of the mixed liquid stirring area, and a mixed liquid discharge valve 308 is installed on the mixed liquid discharge pipe 306.

[0008] Furthermore, a heat-conducting oil temperature measuring tube 313 is provided inside the hollow interior of the heat-conducting oil heat transfer layer 303, and a hot asphalt and recycling agent mixture temperature measuring tube 314 is provided in the mixing area.

[0009] Furthermore, the hot asphalt storage tank assembly 1 includes a hot asphalt storage tank 101, a hot asphalt proportioning pump suction pipe 102, a hot asphalt proportioning pump drive servo motor 103, a hot asphalt proportioning pump 104, and a hot asphalt heating and conveying insulation hose 105. The inlet of the hot asphalt proportioning pump 104 is connected to the hot asphalt proportioning pump suction pipe 102 that passes through the hot asphalt storage tank 101, and the outlet of the hot asphalt proportioning pump 104 is connected to the hot asphalt inlet pipe 319 via the hot asphalt heating and conveying insulation hose 105. The drive flange of the hot asphalt proportioning pump 104 is connected to the hot asphalt proportioning pump drive servo motor 103. The regenerant storage tank assembly 2 includes a regenerant storage tank 201, a regenerant proportioning pump suction pipe 202, a regenerant proportioning pump drive servo motor 203, a regenerant proportioning pump 204, and a regenerant heating and conveying insulation hose 205. The inlet of the regenerant proportioning pump 204 is connected to the regenerant proportioning pump suction pipe 202 that passes through the regenerant storage tank 201. The outlet of the regenerant proportioning pump 204 is connected to the regenerant inlet pipe 320 via the regenerant heating and conveying insulation hose 205. The drive flange of the regenerant proportioning pump 204 is connected to the regenerant proportioning pump drive servo motor 203.

[0010] Regarding the constant temperature conveying device components and the quantitative equal distribution components.

[0011] The hot asphalt and recycling agent mixing and adding system also includes a constant temperature conveying device component 4 and a quantitative equal distribution component 5; The constant-temperature conveying device assembly 4 includes a T-type three-way valve 401, a servo motor 402 driving the variable pump for mixing liquid conveying, a variable pump 403 for mixing liquid conveying, a constant-temperature heating and conveying hose 404 for mixing liquid, a filter 405, a connecting pipe 406, and a constant-temperature heating and conveying sleeve 407 for mixing liquid. Port 1 of the T-type three-way valve 401 is connected to the outlet pipe 312 of the hot asphalt and recycling agent mixture, and port 2 of the T-type three-way valve 401 is connected to the inlet of the variable pump 403 for mixing liquid conveying. The variable pump 403 drive flange is connected to the mixed liquid delivery variable pump drive servo motor 402. The mixed liquid heating and delivery thermostatic hose 404 is connected to the outlet of the mixed liquid delivery variable pump 403 and the inlet of the filter 405. The connecting pipe 406 is connected to the outlet of the filter 405 and the inlet of the quantitative equal distribution device 501 in the quantitative equal distribution assembly 5. The mixed liquid heating and delivery thermostatic soft sleeve 407 wraps and fits the filter 405, the connecting pipe 406, and the quantitative equal distribution device 501. The quantitative equal distribution component 5 includes a quantitative equal distribution device 501, multiple equally divided centrifugal discs, and a heated conveying constant temperature hose. The quantitative equal distribution device 501 includes a body 5011, a series-parallel centrifugal wheel 5012, and a series-parallel centrifugal wheel shaft 5013. The series-parallel centrifugal wheel 5012 is rotatably connected to the body 5011 via the series-parallel centrifugal wheel shaft 5013 and rotates under the drive of a rotational power source. The connecting pipe 406 is connected to the inlet of the body 5011, and each centrifugal disc is connected to the body 5011 through a heated conveying constant temperature hose. The centrifugal discs are equidistantly distributed.

[0012] Regarding the purge and cleaning component.

[0013] The hot asphalt and recycling agent mixing and adding system also includes a purging and cleaning component 6 connected to port 3 of the T-type three-way valve 401. The purging and cleaning component 6 includes an air tank 604 connected to port 3 of the T-type three-way valve 401 via an air pipe, and a valve 602 is installed in the air pipe.

[0014] Regarding data acquisition and monitoring control systems.

[0015] The hot asphalt and recycling agent mixing and adding system also includes a data acquisition and monitoring control system 7. The data acquisition and monitoring control system 7 is connected to the heat transfer oil temperature measuring tube 313, the hot asphalt and recycling agent mixture temperature measuring tube 314, the hot asphalt proportioning supply pump drive servo motor 103, the recycling agent proportioning supply pump drive servo motor 203, the heater 311, and the mixture delivery variable pump drive servo motor 402 via control lines.

[0016] This invention employs a hot asphalt and recycling agent mixing and adding system that features heat preservation and heating, stirring, constant temperature conveying, and quantitative equal distribution via centrifugal discs. The system comprises a hot asphalt storage tank assembly 1, a recycling agent storage tank assembly 2, a heat preservation and heating stirring device assembly 3, a constant temperature conveying device assembly 4, a quantitative equal distribution assembly 5, a purging and cleaning assembly 6, and a data acquisition and monitoring control system 7. The specific working principle is as follows: The recycling agent is stored in a recycling agent storage tank. A PLC controller controls a recycling agent proportioning pump, which in turn drives a servo motor to deliver the recycling agent through a heated, insulated hose into a heated, mixed, and insulated mixing device. Hot asphalt is stored in a hot asphalt storage tank. A data acquisition and monitoring controller controls a hot asphalt proportioning pump, which in turn drives a servo motor to deliver the hot asphalt through a heated, insulated hose into the heated, mixed, and insulated mixing device. Once the hot asphalt and recycling agent are in the heated, mixed, and insulated mixing device, the parameters set by the heat transfer oil temperature controller and the mixture temperature controller are used for rapid heating to the target temperature. When the mixture reaches the required construction temperature, a mixture delivery variable pump, driven by a servo motor, is activated under data acquisition and monitoring. The system automatically controls the flow rate of the variable pump for mixing liquid delivery and the heating and insulation of each heated and constant-temperature delivery hose. The variable pump drives the mixing liquid to pump out the mixture through the heated and constant-temperature delivery hose into the large cavity of the quantitative equal-volume distribution device. Inside the series-parallel centrifugal wheel cavity, the pressure generated by the mixture pumped out by the variable pump drives the series-parallel centrifugal wheels to rotate synchronously, quantitatively and equally distributing the mixture to the output ports of each series-parallel centrifugal wheel. The mixture is then delivered to each set of centrifugal discs through the heated and constant-temperature delivery hoses. The rotation of the centrifugal discs spreads the mixture onto the asphalt pavement, enabling simultaneous spreading of the mixture by several sets. This allows for the realization of quantitative and equal-volume distribution of hot asphalt and recycling agents under actual construction conditions using a reasonable arrangement of parallel centrifugal discs, ensuring uniform spreading.

[0017] Regarding the quantitative equal distribution component, the quantitative equal distribution device described in this invention addresses the issue that the required quantities of hot asphalt and recycling agent in hot recycling construction are relatively small. Conventional multi-component flow devices, such as those using pneumatic assistance or multiple parallel pump sets, cannot achieve synchronous quantitative equal distribution from the drive element end. This invention employs a series-parallel centrifugal wheel distribution device. The required flow rate of the mixture per unit time enters the inlet of the quantitative equal distribution device driven by a variable displacement pump. The pressure generated by the mixture pumped out by the variable displacement pump drives the series-parallel centrifugal wheels to rotate synchronously. At various speeds, each series-parallel centrifugal wheel outputs an equal amount of mixture. Therefore, under various operating conditions and speeds, the output flow rate of each group is the same, realizing the principle of quantitative equal distribution, and is unaffected by changes in flow rate. Therefore, in the actual construction of hot recycling with hot asphalt and recycling agent mixture, the position of the centrifugal discs is reasonably arranged by using a quantitative equal distribution device, which maximizes the construction width of the spreading and directly adds hot asphalt and recycling agent to the asphalt pavement surface material that needs the most missing asphalt and needs to be recycled and restored. This ensures the accuracy and uniformity of the amount of hot asphalt and recycling agent added during the construction operation and improves the quality of the asphalt pavement.

[0018] After construction, some mixed liquid will remain in the mixed liquid delivery pipeline. To prevent blockage of the pipeline and other components during the next construction, the data acquisition and monitoring control system can connect ports 2 and 3 of the three-way ball valve, while blocking port 1. The data acquisition and monitoring control system can also open the gas valve, allowing high-pressure gas from the gas tank to enter the delivery pipeline through the gas pipe, thus discharging the remaining mixed liquid and preventing blockage during the next construction.

[0019] Overall, unlike heating or mixing separately, this project mixes hot asphalt and recycling agent together evenly, with precise control over the amount. It also heats and distributes the mixture evenly in the pipeline process, and finally uses a disc-spreading method.

[0020] In this case, hot asphalt and recycling agent are added in proportion, and continuous heating and mixing are carried out in a heat-insulating and heating mixing device. The data acquisition and monitoring control system automatically starts and stops the conveying, heating, mixing, and heat preservation, adapting to the requirements of various working conditions to achieve heat-insulating and heating mixing, constant temperature conveying, and quantitative equal distribution of the mixture by centrifugal discs. The quantitative equal distribution device only needs the pressure generated by the mixture pumped out by the variable pump to drive the series and parallel centrifugal wheels, realizing multiple sets of flow outputs for various flow distributions. By rationally arranging the quantitative equal distribution device, the construction width of the spreading is maximized. Attached Figure Description

[0021] Figure 1 This is a structural diagram of the case. Figure 2This is a structural diagram of the heat preservation, heating, and stirring device assembly in this case. Figure 3 This is a structural diagram of the hot asphalt storage tank assembly and the recycling agent storage tank assembly in this case. Figure 4 This is a structural schematic diagram of the constant temperature conveying device assembly in this case. Figure 5 This is a schematic diagram of a quantitative equal distribution device. Figure 6 yes Figure 5 Sectional view along axis AA; In the figure, 1 is the hot asphalt storage tank assembly, 2 is the recycling agent storage tank assembly, 3 is the heat preservation, heating, adding and mixing device assembly, 4 is the constant temperature conveying device assembly, 5 is the quantitative equal distribution assembly, 6 is the purging and cleaning assembly, and 7 is the data acquisition and monitoring control system. 101 is the hot asphalt storage tank, 102 is the hot asphalt proportioning pump suction pipe, 103 is the hot asphalt proportioning pump drive servo motor, 104 is the hot asphalt proportioning pump, and 105 is the hot asphalt heating and conveying insulation hose. 201 is the regenerant storage tank, 202 is the regenerant proportioning supply pump suction pipe, 203 is the regenerant proportioning supply pump drive servo motor, 204 is the regenerant proportioning supply pump, and 205 is the regenerant heating and conveying insulation hose. 301 is the insulation layer; 302 is the hot air layer; 303 is the heat transfer oil layer; 304 is the heat transfer oil overflow vent pipe; 305 is the heat transfer oil unloading pipe; 306 is the mixed liquid unloading pipe; 307 is the heat transfer oil unloading valve; 308 is the mixed liquid unloading valve; 309 is the heating fuel tank; 310 is the heater fuel connection pipe; 311 is the heater; 312 is the hot asphalt and recycling agent mixture outlet pipe; 313 is the heat transfer oil temperature measuring pipe; 314 is the hot asphalt and recycling agent mixture temperature measuring pipe; 315 is the stirring shaft; 316 is the connecting bolt; 317 is the connecting shaft; 318 is the stirring drive motor; 319 is the hot asphalt inlet pipe; 320 is the recycling agent inlet pipe; 39 is the exhaust port. 401 is a T-type three-way valve; 402 is a servo motor driving the variable displacement pump for mixing liquid; 403 is a variable displacement pump for mixing liquid; 404 is a thermostatic heating and conveying hose for mixing liquid; 405 is a filter; 406 is a connecting pipe; 407 is a thermostatic heating and conveying sleeve for mixing liquid; 501 is a quantitative equal distribution device; 502 is the first centrifuge disc; 503 is the first thermostatic heating and conveying hose; 504 is the second centrifuge disc; 505 is the second thermostatic heating and conveying hose; 506 is the third centrifuge disc; 507 is the third thermostatic heating and conveying hose; 508 is the fourth centrifuge disc; 509 is the fifth thermostatic heating and conveying hose; 510 is the fifth centrifuge disc; 511 is a thermostatic heating and conveying hose; 601 is an air pipe; 602 is a valve; 603 is an air pipe. 604 is the gas storage tank; 720 is the data acquisition and monitoring control cabinet; 721 is the heat transfer oil temperature controller; 722 is the mixed liquid temperature controller; 701 is the heating and conveying constant temperature hose control line; 702 is the heating and conveying constant temperature hose control line; 703 is the heating and conveying constant temperature hose control line; 704 is the heating and conveying constant temperature hose control line; 705 is the heating and conveying constant temperature hose control line; 706 is the mixed liquid heating and conveying constant temperature soft sleeve control line; 707 is the mixed liquid temperature controller control line; 708 is the heat transfer oil temperature controller control line; 709 is the mixed liquid conveying variable pump drive servo motor control line; 710 is the heater control line; 711 is the hot asphalt proportioning supply pump drive servo motor control line; 712 is the recycling agent proportioning supply pump drive servo motor. Detailed Implementation

[0022] To clearly illustrate the technical features of the present invention, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0023] The present invention is as follows Figure 1-3 As shown, the hot asphalt and recycling agent mixing and adding system includes a hot asphalt storage tank assembly 1, a recycling agent storage tank assembly 2, a heat preservation and heating adding and stirring device assembly 3, a constant temperature conveying device assembly 4, a quantitative equal distribution assembly 5, a purging and cleaning assembly 6, and a data acquisition and monitoring control system 7.

[0024] The hot asphalt storage tank assembly 1 includes a hot asphalt storage tank 101, a hot asphalt proportioning pump suction pipe 102, a hot asphalt proportioning pump drive servo motor 103, a hot asphalt proportioning pump 104, and a hot asphalt heating and conveying insulation hose 105. The inlet flange of the hot asphalt proportioning pump 104 is connected to the interface flange of the hot asphalt storage tank 101. The inlet of the hot asphalt proportioning pump 104 is connected to the connector of the hot asphalt proportioning pump suction pipe 102. The drive flange of the hot asphalt proportioning pump 104 is connected to the drive flange of the hot asphalt proportioning pump drive servo motor 103. The outlet of the hot asphalt proportioning pump 104 is connected to the connector of the hot asphalt heating and conveying insulation hose 105.

[0025] The regenerant storage tank assembly 2 includes a regenerant storage tank 201, a regenerant proportioning pump suction pipe 202, a regenerant proportioning pump drive servo motor 203, a regenerant proportioning pump 204, and a regenerant heating and conveying insulated hose 205. The inlet flange of the regenerant proportioning pump 204 is connected to the interface flange of the regenerant storage tank 201. The inlet of the regenerant proportioning pump 204 is connected to the connector of the regenerant proportioning pump suction pipe 202. The drive flange of the regenerant proportioning pump 204 is connected to the drive flange of the regenerant proportioning pump drive servo motor 203. The outlet of the regenerant proportioning pump 204 is connected to the connector of the regenerant heating and conveying insulated hose 205.

[0026] The hot asphalt heating and conveying insulated hose 105 connector is connected to the hot asphalt inlet pipe 319 on the upper part of the insulated heating and adding mixing device assembly 3; the inlet flange of the recyclering proportioning pump 204 is connected to the interface flange of the recyclering storage tank 201, the inlet of the recyclering proportioning pump 204 is connected to the recyclering proportioning pump suction pipe 202 connector, the drive flange of the recyclering proportioning pump 204 is connected to the drive flange of the recyclering proportioning pump drive servo motor 203, the outlet of the recyclering proportioning pump 204 is connected to the recyclering heating and conveying insulated hose 205 connector, and the recyclering heating and conveying insulated hose 205 connector is connected to the recyclering inlet pipe 320 on the upper part of the insulated heating and adding mixing device assembly 3. Before adding the regenerative agent and heating it, asphalt pavement surveyors take samples from the original pavement for analysis to determine the required ratio of hot asphalt to recycling agent. New asphalt pavement typically has an asphalt-to-aggregate ratio of 5:95, meaning an asphalt content of 5%. After asphalt pavement wears down, extensive construction sampling and analysis show that asphalt loss does not exceed 10% of the asphalt content. The aged asphalt layer, or surface layer, requires restoration. Based on this analysis, the aged asphalt that needs to be restored is the surface layer, generally not exceeding 50% of the asphalt content. The calculation for the required recycling agent is as follows: For example, the equipment travel speed is 3 m / min, the width of the recycled pavement is 4 m, the depth is 0.04 m, the asphalt-to-aggregate ratio is 5:95, the recycling agent ratio for restoring aged asphalt is 5%, and the asphalt mixture density is 2400 kg / m³. 3 The density of the regenerant is 900 kg / m³. 3The required amount of hot asphalt and recycling agent per minute is calculated as follows: the required hot asphalt is 3 x 4 x 0.04 x 5% x 10% x 2400 = 0.576 kg, and the required recycling agent is 3 x 4 x 0.04 x 5% x 50% x 5% x 2400 = 1.44 kg. The construction personnel input the above parameters into the data acquisition and monitoring control system. After pressing start, the data acquisition and monitoring control system connects to the hot asphalt proportioning supply pump drive servo motor control line 711 and the recycling agent proportioning supply pump drive servo motor 712, controlling the hot asphalt proportioning supply pump drive servo motor to pump a fixed flow rate of hot asphalt into the insulation heating and mixing device according to the program. Similarly, it controls the recycling agent proportioning supply pump drive servo motor to pump a fixed flow rate of recycling agent into the insulation heating and mixing device according to the program.

[0027] The heat-insulating, heating, and stirring device assembly 3 includes an insulation layer 301, a hot air layer 302, a heat transfer oil heat transfer layer 303, a heat transfer oil overflow vent pipe 304, a heat transfer oil unloading pipe 305, a mixed liquid discharge pipe 306, a heat transfer oil unloading valve 307, a mixed liquid discharge valve 308, a heating fuel tank 309, a heater fuel connection pipe 310, a heater 311, a hot asphalt and recycling agent mixture outlet pipe 312, a heat transfer oil temperature measuring pipe 313, a hot asphalt and recycling agent mixture temperature measuring pipe 314, and a stirring shaft 3. 15. Connecting bolts 316, connecting shaft 317, stirring drive motor 318, hot asphalt inlet pipe 319, recycling agent inlet pipe 320. The outermost layer of the heat-insulating, heating, adding, and stirring device assembly 3 is an insulation layer 301, and the innermost layer is a heat-conducting oil heat transfer layer 303. The interlayer between the insulation layer 301 and the heat-conducting oil heat transfer layer 303 is a hot air layer 302. The heat-conducting oil overflow vent pipe 304 is installed inside the heat-conducting oil heat transfer layer 303, and the heat-conducting oil unloading pipe 305 is installed at the bottom of the heat-conducting oil heat transfer layer 303. The mixture discharge pipe 306 is located at the bottom of the mixture; the heat transfer oil discharge valve 307 is located at the bottom end of the heat transfer oil discharge pipe 305; the mixture discharge valve 308 is located at the bottom end of the mixture discharge pipe 306; the heating fuel tank 309 is installed next to the insulation layer 301; the heater 311 is installed on the left side of the insulation layer 301, below the heat transfer oil heat transfer layer 303; and the hot asphalt and recycling agent mixture outlet pipe 312 is located on the left side, passing through the insulation layer 301, the hot air layer 302, and the heat transfer oil heat transfer layer 303. The heat transfer layer 303 includes a heat transfer oil temperature measuring tube 313 located at the top of the heat transfer oil heat transfer layer 303 and passing through the top insulation layer 301. The hot asphalt and recycling agent mixture temperature measuring tube 314 is located at the top and passes through the top insulation layer 301. The stirring drive motor 318 is installed in the middle of the top and connected to the connecting shaft 317 by a keyway. The stirring shaft 315 is bolted to the connecting shaft 317. The hot asphalt inlet pipe 319 and the recycling agent inlet pipe 320 are located at the top and pass through the top insulation layer 301.

[0028] The heater fuel connection pipe 310 is connected to the heater 311 and the heating fuel tank 309. After fuel is supplied, it is ignited below the heat transfer oil heat transfer layer 303 for heating. In addition, a flue vent 39 is installed on the top of the hot gas layer 302 to remove the exhaust gas from the heat source combustion.

[0029] As for the heat transfer oil, it can be discharged through the heat transfer oil overflow vent pipe 304 after being heated. When the amount of heat transfer oil is insufficient, the heat transfer oil overflow vent pipe 304 can be connected to the heat transfer oil pump to replenish the heat transfer oil.

[0030] When the construction personnel input the parameters into the data acquisition and monitoring control system and press start, the hot asphalt proportioning pump drives the servo motor to pump a fixed flow rate of hot asphalt into the insulation heating and mixing device according to the program. Similarly, the recycling agent proportioning pump drives the servo motor to pump a fixed flow rate of recycling agent into the insulation heating and mixing device according to the program. The data acquisition and monitoring control system uses the mixture temperature collected by the mixture control line 707 to provide system feedback to determine whether the mixture temperature has reached the set mixing temperature. If it has, the hot asphalt and recycling agent are mixed evenly together. If the set mixing temperature has not been reached, the data acquisition and monitoring control system uses the heater control line 710 to control the heater 311 to heat the heat transfer oil layer of the insulation heating and mixing device. Heating is performed at 303. The data acquisition and monitoring control system collects the temperature of the heat transfer oil mixture through the heat transfer oil mixture control line 708 to control the temperature of the heat transfer oil. This prevents the temperature of the heat transfer oil from becoming too high and affecting the performance of the mixture. When the heat transfer oil is heated to the set temperature, the data acquisition and monitoring control system controls the heater 311 to stop heating the heat transfer oil heat transfer layer 303 of the heat transfer oil with the added stirring device through the heater control line 710. This ensures that the mixture is heated and transferred evenly. After the mixture is heated to the set stirring temperature, the data acquisition and monitoring control system collects the temperature of the mixture through the mixture control line 707 and provides system feedback. Then, the data acquisition and monitoring control system drives the stirring drive motor 318 through system control to stir the hot asphalt and recycling agent mixture evenly and heat it to the output temperature set by the system.

[0031] The constant-temperature conveying device assembly 4 includes a T-type three-way valve 401, a servo motor 402 driving the variable pump for mixing liquid conveying, a variable pump 403 for mixing liquid conveying, a constant-temperature heating and conveying hose 404 for mixing liquid, a filter 405, a connecting pipe 406, and a constant-temperature heating and conveying sleeve 407 for mixing liquid. The inlet 1 of the T-type three-way valve 401 is connected to the outlet pipe 312 of the hot asphalt and recycling agent mixture; the outlet 2 of the T-type three-way valve 401 is connected to the inlet of the variable pump 403 for mixing liquid conveying; the driving flange of the variable pump 403 is connected to the driving flange of the servo motor 402 for mixing liquid conveying; the constant-temperature heating and conveying hose 404 is connected to the outlet of the variable pump 403 and the inlet of the filter 405; the connecting pipe 406 is connected to the outlet of the filter 405 and the inlet of the quantitative equal distribution device 501; and the constant-temperature heating and conveying sleeve 407 encloses the filter 405, the connecting pipe 406, and the quantitative equal distribution device 501.

[0032] After the hot asphalt and recycling agent mixture is stirred evenly and heated to the system's set output temperature, the data acquisition and monitoring control system connects port 1 and port 2 of the T-type three-way valve 401 through system control, while port 3 is closed. The data acquisition and monitoring control system drives the servo motor control line 709 through the mixture delivery variable pump, which in turn drives the servo motor 402 to drive the mixture delivery variable pump 403. Throughout the mixture delivery process, the data acquisition and monitoring control system collects and provides temperature feedback, and controls whether heating or heat preservation is needed based on the feedback. The mixture delivery variable pump 403 outputs the mixture quantitatively and stably to the end under the set parameters.

[0033] The quantitative equal distribution component 5 includes a quantitative equal distribution device 501, a first centrifugal disc 502, a first heating and conveying constant temperature hose 503, a second centrifugal disc 504, a second heating and conveying constant temperature hose 505, a third centrifugal disc 506, a third heating and conveying constant temperature hose 507, a fourth centrifugal disc 508, a fourth heating and conveying constant temperature hose 509, a fifth centrifugal disc 510, and a fifth heating and conveying constant temperature hose 511. The quantitative equal distribution device 501 consists of a body 5011, a series-parallel centrifugal wheel 5012, and a series-parallel centrifugal wheel shaft 5013. The first heating and conveying constant temperature hose 503, the second heating and conveying constant temperature hose 505, the third heating and conveying constant temperature hose 507, the fourth heating and conveying constant temperature hose 509, and the fifth heating and conveying constant temperature hose 511 are connected to the first centrifugal disc 502, the second centrifugal disc 504, the third centrifugal disc 506, the fourth centrifugal disc 508, the fifth centrifugal disc 510, and the quantitative equal distribution device 501.

[0034] When the variable displacement pump for mixing liquid delivers a stable and quantitative output of the mixed liquid to the end under the set parameters, filling the front cavity of the quantitative equal distribution device, the servo motor 402 drives the variable displacement pump 403 for automatic control of the flow rate of the variable displacement pump 403 and the heating and insulation control of each heating and constant temperature hose. This drives the variable displacement pump 403 to pump the mixed liquid through the heating and constant temperature hose into the large cavity of the quantitative equal distribution device 501, where it is connected to the series-parallel centrifugal impeller 5012. Inside the cavity, the pressure generated by the mixture pumped out by the variable pump 403 drives the series-parallel centrifugal wheels 5012 to rotate synchronously, distributing the mixture quantitatively and equally to the output ports of each series-parallel centrifugal wheel 5012. The mixture is then delivered to each centrifugal disc through each set of heated and constant-temperature hoses. The rotation of the centrifugal discs spreads the mixture onto the asphalt pavement, enabling the simultaneous spreading of the mixture by several sets. This allows for the quantitative and equal distribution of hot asphalt and recycling agent using the rational arrangement of parallel centrifugal discs under actual construction conditions, while also ensuring uniform spreading.

[0035] The purging and cleaning assembly 6 includes an air pipe 601, a valve 602, an air pipe 603, and an air tank 604. The air pipe 601 is connected to the valve 602 and the inlet 3 of the T-type three-way valve 401, and the air pipe 603 is connected to the outlet of the valve 602 and the air tank 604.

[0036] After construction, some mixed liquid will remain in the mixed liquid delivery pipeline. To prevent blockage of the pipeline and other components during the next construction, the data acquisition and monitoring control system controls the connection of ports 2 and 3 of the three-way ball valve 401, while port 1 is blocked. The data acquisition and monitoring control system also controls the opening of the gas valve 602, allowing the high-pressure gas in the gas tank to enter the delivery pipeline through the gas pipe, thus discharging the remaining mixed liquid in the mixed liquid delivery pipeline and preventing blockage during the next construction.

[0037] The data acquisition and monitoring control system 7 includes a data acquisition and monitoring control cabinet 720, a heat transfer oil temperature controller 721, a mixed liquid temperature controller 722, a heating and conveying constant temperature hose control line 701, a heating and conveying constant temperature hose control line 702, a heating and conveying constant temperature hose control line 703, a heating and conveying constant temperature hose control line 704, a heating and conveying constant temperature hose control line 705, a mixed liquid heating and conveying constant temperature flexible sleeve control line 706, a mixed liquid temperature controller control line 707, a heat transfer oil temperature controller control line 708, a mixed liquid conveying variable pump drive servo motor control line 709, a heater control line 710, a hot asphalt proportioning supply pump drive servo motor control line 711, and a regeneration... The agent proportioning supply pump drive servo motor 712, and the data acquisition and monitoring control cabinet 720 are respectively connected to the heating and conveying constant temperature hose control lines 701, 702, 703, 704, 705, 706, 707, 708, 709, 710, 711, and 712.

[0038] It receives data from the heat transfer oil temperature measuring tube 313, the hot asphalt and recycling agent mixture temperature measuring tube 314, and the quantitative equal distribution device 501, and controls the hot asphalt proportioning supply pump drive servo motor 103, the recycling agent proportioning supply pump drive servo motor 203, the heater 311, and the mixture delivery variable pump drive servo motor 402.

[0039] There are many specific ways to implement this invention. The above description is only a preferred embodiment of this invention. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of this invention, and these improvements should also be considered within the scope of protection of this invention.

Claims

1. A system for mixing and adding hot asphalt and recycling agent, characterized in that, It includes a hot asphalt storage tank assembly (1) for supplying hot asphalt, a recycling agent storage tank assembly (2) for supplying recycling agent, and a heat-insulating heating and mixing device assembly (3) for mixing. The heat-insulating heating and stirring device assembly (3) includes, from the outside to the inside, a heat-insulating layer (301), a hot air layer (302), and a heat-conducting oil heat transfer layer (303). The heat-conducting oil heat transfer layer (303) is fixedly installed on the upper part of the heat-insulating layer (301), and the hollow interior of the heat-conducting oil heat transfer layer (303) is filled with heat-conducting oil. The area inside the heat-conducting oil heat transfer layer (303) is the mixing area, and the area below the heat-conducting oil heat transfer layer (303) is the heat source inlet area. A stirring shaft (315) is installed in the mixing area, and the power source of the stirring shaft (315) is provided outside the heat-insulating layer (301). The top of the insulation layer (301) is also provided with a hot asphalt inlet pipe (319) and a recycling agent inlet pipe (320) that lead into the mixing zone of the mixture. The hot asphalt inlet pipe (319) is connected to the hot asphalt storage tank assembly (1), and the recycling agent inlet pipe (320) is connected to the recycling agent storage tank assembly (2). The insulation layer (301) also has an outlet pipe (312) for hot asphalt and recycling agent mixture that leads to the bottom of the mixing zone.

2. The hot asphalt and recycling agent mixing and adding system according to claim 1, characterized in that, The heat preservation heating and stirring device assembly (3) also includes a heat transfer oil overflow vent pipe (304), a heat transfer oil unloading pipe (305), and a mixed liquid discharge pipe (306). The heat transfer oil overflow vent pipe (304) penetrates into the hollow interior of the heat transfer oil heat transfer layer (303), and its top opening is higher than the liquid level of the heat transfer oil. The heat transfer oil unloading pipe (305) penetrates into the hollow interior of the heat transfer oil heat transfer layer (303), and its top opening is at the bottom of the liquid level of the heat transfer oil. A heat transfer oil unloading valve (307) is installed on the heat transfer oil unloading pipe (305). The mixed liquid discharge pipe (306) penetrates from bottom to top into the bottom of the mixed liquid stirring area, and a mixed liquid discharge valve (308) is installed on the mixed liquid discharge pipe (306).

3. The hot asphalt and recycling agent mixing and adding system according to claim 1, characterized in that, The hollow interior of the heat transfer oil heat transfer layer (303) is provided with a heat transfer oil temperature measuring tube (313), and the mixing area of ​​the mixture is provided with a hot asphalt and recycling agent mixture temperature measuring tube (314).

4. The hot asphalt and recycling agent mixing and adding system according to claim 1, characterized in that, The hot asphalt storage tank assembly (1) includes a hot asphalt storage tank (101), a hot asphalt proportional supply pump suction pipe (102), a hot asphalt proportional supply pump drive servo motor (103), a hot asphalt proportional supply pump (104), and a hot asphalt heating and conveying insulation hose (105). The inlet of the hot asphalt proportional supply pump (104) is connected to the hot asphalt proportional supply pump suction pipe (102) that passes through the hot asphalt storage tank (101). The outlet of the hot asphalt proportional supply pump (104) is connected to the hot asphalt inlet pipe (319) via the hot asphalt heating and conveying insulation hose (105). The drive flange of the hot asphalt proportional supply pump (104) is connected to the hot asphalt proportional supply pump drive servo motor (103). The regenerant storage tank assembly (2) includes a regenerant storage tank (201), a regenerant proportioning pump suction pipe (202), a regenerant proportioning pump drive servo motor (203), a regenerant proportioning pump (204), and a regenerant heating and conveying insulation hose (205). The inlet of the regenerant proportioning pump (204) is connected to the regenerant proportioning pump suction pipe (202) that passes through the regenerant storage tank (201). The outlet of the regenerant proportioning pump (204) is connected to the regenerant inlet pipe (320) via the regenerant heating and conveying insulation hose (205). The drive flange of the regenerant proportioning pump (204) is connected to the regenerant proportioning pump drive servo motor (203).

5. The hot asphalt and recycling agent mixing and adding system according to claim 1, characterized in that, The hot asphalt and recycling agent mixing and adding system also includes a constant temperature conveying device component (4) and a quantitative equal distribution component (5). The constant temperature conveying device assembly (4) includes a T-type three-way valve (401), a servo motor (402) driving the variable pump for mixing liquid conveying, a variable pump for mixing liquid conveying (403), a constant temperature heating and conveying hose for mixing liquid (404), a filter (405), a connecting pipe (406), and a constant temperature heating and conveying sleeve for mixing liquid (407); port 1 of the T-type three-way valve (401) is connected to the outlet pipe (312) of the hot asphalt and recycling agent mixture, and port 2 of the T-type three-way valve (401) is connected to the inlet of the variable pump for mixing liquid conveying (403). The flow pump (403) drive flange is connected to the mixed liquid delivery variable pump drive servo motor (402), the mixed liquid heating and delivery constant temperature hose (404) is connected to the outlet of the mixed liquid delivery variable pump (403) and the inlet of the filter (405), the connecting pipe (406) is connected to the outlet of the filter (405) and the inlet of the quantitative equal distribution device (501) in the quantitative equal distribution assembly (5), and the mixed liquid heating and delivery constant temperature soft sleeve (407) wraps and fits the filter (405), the connecting pipe (406), and the quantitative equal distribution device (501) into it; The quantitative equal distribution component (5) includes a quantitative equal distribution device (501), a plurality of equally divided centrifugal discs, and a heating and conveying constant temperature hose; the quantitative equal distribution device (501) includes a body (5011), a series-parallel centrifugal wheel (5012), and a series-parallel centrifugal wheel shaft (5013). The series-parallel centrifugal wheel (5012) is rotatably connected to the body (5011) via the series-parallel centrifugal wheel shaft (5013) and rotates under the drive of a rotational power source. The connecting pipe (406) is connected to the inlet of the body (5011), and each centrifugal disc is connected to the body (5011) through a heating and conveying constant temperature hose. Each centrifugal disc is equidistantly distributed.

6. The hot asphalt and recycling agent mixing and adding system according to claim 5, characterized in that, The hot asphalt and recycling agent mixing and adding system also includes a purging and cleaning assembly (6) connected to port 3 of the T-type three-way valve (401). The purging and cleaning assembly (6) includes an air tank (604) connected to port 3 of the T-type three-way valve (401) via an air pipe, and a valve (602) is installed in the air pipe.

7. The hot asphalt and recycling agent mixing and adding system according to claim 1, characterized in that, The hot asphalt and recycling agent mixing and adding system also includes a data acquisition and monitoring control system (7), which is connected to the heat transfer oil temperature measuring tube (313), the hot asphalt and recycling agent mixture temperature measuring tube (314), the hot asphalt proportioning supply pump drive servo motor (103), the recycling agent proportioning supply pump drive servo motor (203), the heater (311), and the mixture delivery variable pump drive servo motor (402) via control lines.

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