High-mixing-amount intermittent hot mix plant regeneration system for asphalt pavement milling material

Abstract

The utility model provides a high-mixing-amount intermittent hot mix plant regeneration system for asphalt pavement milling materials. The system comprises a regeneration cold material bin, a belt conveyer belt, a regeneration material elevator, a combustion chamber, a regeneration roller and the like. The combustion chamber is provided with an ignition protective door to guarantee safety; the new aggregate heating roller and the regeneration roller are independently heated, the regeneration roller is indirectly heated, the heating uniformity is improved by adjusting a wing plate, and the temperature is controlled by a temperature sensor. And the flue gas treatment system adopts a negative pressure air duct structure, so that the smoke dust emission is reduced. The stirring bin is provided with an efficient double-shaft stirring arm, so that the mixing uniformity and the construction performance are improved. The system can optimize the heating and mixing process of the milling material, improve the quality of the regenerated mixture, reduce pollution and energy consumption, and promote the application of high-doping-amount RAP in the production of the regenerated asphalt mixture.

Description

Technical Field

[0001] This utility model relates to the field of road material recycling technology, specifically to a high-volume intermittent plant-mixed hot recycling system for asphalt pavement milling material. Background Technology

[0002] With the increase in highway construction and maintenance projects, a large amount of rough asphalt pavement (RAP) is generated. Recycling RAP can reduce costs, increase efficiency, and reduce pollution. Traditional RAP recycling methods (such as direct backfilling, hot recycling, and cold recycling) have many problems. The RAP particles are uneven in size and contain a lot of impurities and dust, which affects the quality of recycled aggregate and the quality of newly laid asphalt mixture.

[0003] Existing processing equipment has limited functionality and cannot meet the demand. Traditional vibrating screens are ineffective at screening fine particles and easily generate dust; single-stage magnetic separators cannot remove non-magnetic impurities; and ordinary air separators are greatly affected by the moisture content and particle shape of the material.

[0004] Intermittent plant-mixed hot recycling technology also faces challenges in recycling high-dosage RAP. Traditional single-drum heating easily leads to uneven heating of RAP, localized overheating and aging, and the volatilization of lightweight components polluting the environment. A single heat source results in long heating times, high energy consumption, and low efficiency. The different heating methods for new aggregates and RAP affect the uniformity of the mixture and the quality of construction. Therefore, a new recycling system is urgently needed to solve these problems.

[0005] To address the aforementioned issues, this invention proposes a high-volume intermittent plant-mixed hot recycling system for asphalt pavement milling aggregate, featuring dual-drum heating, flue gas recovery, and intelligent temperature control. This system aims to improve the heating uniformity of the recycled material, reduce pollutant emissions, enhance thermal energy utilization efficiency, and ensure the quality stability of the final mixture. Utility Model Content

[0006] The purpose of this invention is to provide a high-volume intermittent hot recycling system for asphalt pavement milling aggregate. By optimizing the dual-drum heating structure, flue gas recirculation system, intelligent temperature control system, and mixing device, the system improves the heating uniformity of the milling aggregate and the quality of the recycled mixture, while reducing pollutant emissions and energy consumption, enabling high-volume RAP to be better applied to the production of recycled asphalt mixtures.

[0007] To achieve the above objectives, this technical solution provides a high-content intermittent hot recycling system for asphalt pavement milling aggregate, comprising:

[0008] Recycled cold material bins are used to store milling materials;

[0009] A belt conveyor connects the recycled cold silo and the recycled material elevator, used to transport milled material to the recycled material elevator;

[0010] The recycled material elevator is arranged vertically and is used to lift milled material to a preset position and enter the recycling drum;

[0011] The combustion chamber is located to the left of the new aggregate heating drum. It has a new aggregate inlet at the top and an ignition protection door at the front. It is used for fuel combustion and to provide heat energy.

[0012] The new aggregate heating drum uses a direct heating method to heat the new aggregate.

[0013] The recycling drum uses indirect heating and is equipped with thermal resistance steel, V-shaped wing plates, and adjustable wing plates to ensure that the milled material is heated evenly. A temperature sensor is installed on the right end to detect the material temperature.

[0014] The flue gas settling chamber, located below the regeneration drum, is used to collect and treat high-temperature waste gas. It is equipped with a condenser dust collector to further purify the flue gas.

[0015] The induced draft fan, located below the flue gas settling chamber, is used to circulate the flue gas and ultimately discharge it through the exhaust chimney;

[0016] The temporary storage bin for recycled materials is connected to the right side of the recycling drum and is used to store heated recycled materials.

[0017] The metering hopper, connected to the lower part of the temporary storage silo for recycled materials, is used to precisely control the feeding ratio of new aggregate, RAP, recycling agent and new asphalt;

[0018] The mixing chamber is equipped with twin-shaft mixing arms to uniformly mix the metered recycled material, new aggregate, and recycling agent to ultimately form recycled asphalt mixture.

[0019] Furthermore, the combustion chamber is equipped with an ignition protection door.

[0020] Furthermore, the flue gas settling chamber adopts a negative pressure duct structure.

[0021] Furthermore, the adjustable blades of the regenerating drum can be angled to ensure uniform heating of RAP particles of different sizes.

[0022] Furthermore, the mixing chamber employs a high-efficiency twin-shaft mixing arm to improve the uniformity and workability of the recycled mixture.

[0023] Furthermore, a temperature sensor is installed inside the recycling drum.

[0024] Furthermore, saw gears are arranged at the front and rear of the regeneration drum body, and a drive motor is arranged at the bottom to make the regeneration drum rotate and heat up.

[0025] Furthermore, the flue gas treatment system consists of a flue gas settling chamber, a condenser dust collector, an induced draft fan, and an exhaust chimney, used to collect and treat the blue smoke generated during the RAP heating process.

[0026] Furthermore, the mixing device consists of a metering hopper, a mixing chamber, and a mixing arm.

[0027] Compared with existing technologies, this technical solution has the following characteristics and beneficial effects:

[0028] 1. This utility model achieves independent heating and uniform preheating of new aggregate and RAP by combining a dual-drum heating system with a temporary storage bin for recycled materials, ensuring stable material temperature, effectively avoiding local overheating and aging of RAP, and improving the quality stability of the mixture.

[0029] 2. This utility model utilizes the synergistic effect of a flue gas treatment system and a temperature control system to achieve precise control of the RAP heating process. The flue gas treatment system effectively reduces harmful gas emissions and improves environmental performance; the temperature control system monitors the material temperature in real time through multiple temperature sensors to ensure uniform heating, prevent RAP overheating and aging, and improve the quality stability of the recycled material.

[0030] 3. This utility model adopts a high-efficiency mixing device with a dual-shaft mixing paddle structure, which can fully mix the materials during the mixing process, improve the mixing uniformity of new aggregate, RAP, recycling agent and new asphalt, ensure the performance stability of recycled mixture, and enhance the application adaptability of recycled materials in different road construction. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a plant-mixed hot recycling system for high-content milled asphalt pavement aggregate.

[0032] Figure 2 This is a schematic diagram of the internal structure of the plant-mixed hot recycling drum.

[0033] In the diagram: 1. Recycled cold material bin; 2. Belt conveyor; 3. Recycled material elevator; 4. Combustion chamber; 5. New aggregate inlet; 6. New aggregate heating drum; 7. Recycled drum; 8. Temporary recycled material storage bin; 9. Measuring hopper; 10. Mixing arm; 11. Mixing bin; 12. Exhaust chimney; 13. Exhaust fan; 14. Condensation dust collector; 15. Flue gas settling chamber; 16. Ignition protection door; 17. V-shaped wing plate; 18. Thermal resistance steel; 19. Adjustable wing plate; 20. Temperature sensor; 21. Saw gear; 22. Drive motor; 23. Trunnion. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0035] Those skilled in the art should understand that, in the disclosure of this application, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this application.

[0036] This solution provides a high-volume intermittent hot recycling system for asphalt pavement milled aggregate, achieving efficient heating, uniform mixing, and optimized recycled aggregate quality. According to an embodiment of this invention, the high-volume intermittent hot recycling system for asphalt pavement milled aggregate includes a recycled cold aggregate bin 1, a belt conveyor 2, a recycled aggregate elevator 3, a combustion chamber 4, a recycling drum 7, a flue gas settling chamber 15, a condenser dust collector 14, an induced draft fan 13, a temporary recycled aggregate storage bin 8, a metering hopper 9, and a mixing bin 11. The recycled cold aggregate bin 1 is located at the bottom left and is used to store the milled aggregate. The belt conveyor 2 is connected to the right side of the recycled cold aggregate bin 1, conveying the material to the recycled aggregate elevator 3. The recycled aggregate elevator 3 is vertically arranged at the right end of the belt conveyor 2, lifting the milled aggregate to a higher position to enter the recycling drum 7. The combustion chamber 4 is located to the left of the new aggregate heating drum 6, with a new aggregate inlet 5 at the top and an ignition protection door 16 at the front. The new aggregate heating drum 6 is connected to the recycling drum 7 on its right side. The new aggregate and asphalt milling material are mixed and heated in the recycling drum 7. The recycling drum 7 is equipped with thermal resistance steel 18, V-shaped wing plates 17, and adjusting wing plates 19 to ensure that the milling material is heated evenly. A temperature sensor 20 is installed at the right end of the recycling drum 7 to detect the material temperature and ensure temperature stability.

[0037] The recycling drum 7 is equipped with saw gears 21 at the front and rear, and a drive motor 22 is located below the saw gears 21 to rotate and heat the recycling drum 7. A flue gas settling chamber 15 is located below the recycling drum 7 to collect and treat high-temperature exhaust gas. A condenser dust collector 14 is installed inside the flue gas settling chamber 15 to further purify the flue gas. An induced draft fan 13 is located below the flue gas settling chamber 15 to circulate the flue gas, which is ultimately discharged through the lower exhaust chimney. A temporary storage bin 8 for recycled materials is connected to the right side of the recycling drum 7, and a metering hopper 9 is connected to the lower part of the temporary storage bin 8. A mixing bin 11 is connected below the metering hopper 9, and a dual-shaft mixing arm 10 is installed inside the mixing bin 11 to uniformly mix the metered recycled material, new aggregate, and recycling agent to ultimately form recycled asphalt mixture.

[0038] Specifically, the combustion chamber 4 is equipped with an ignition protection door 16 to improve ignition safety. The flue gas settling chamber 15 adopts a negative pressure air duct structure, which can effectively reduce smoke and dust emissions and improve environmental performance. The adjustable wing plates 19 of the regeneration drum 7 can be adjusted to ensure uniform heating of RAP particles of different sizes.

[0039] The mixing chamber 11 employs a high-efficiency twin-shaft mixing arm 10 to improve the uniformity and workability of the recycled mixture. A temperature sensor 20 is installed inside the recycling drum 7 to achieve precise control and ensure stable heating quality of the mixture.

[0040] The operating procedures for a high-content intermittent hot recycling system for asphalt pavement milling aggregate are as follows:

[0041] Asphalt milling material is stored in the recycled cold aggregate bin 1 and conveyed to the recycled material elevator 3 via belt conveyor 2. The recycled material elevator 3 conveys the material to the recycled drum 7 for heating. One end of the recycled drum 7 is connected to the combustion chamber 4, which is equipped with an ignition protection door 16. The upper part of the new aggregate heating drum 6 is equipped with a new aggregate inlet 5. The high-temperature airflow generated by combustion in the combustion chamber 4 enters the recycled drum 7 and passes through the thermal resistance steel 18, V-shaped wing plate 17, and adjusting wing plate 19 to ensure that the milling material is heated evenly to reach the required temperature. The outlet of the recycled drum 7 is equipped with a temperature sensor 20 to monitor the material temperature and ensure temperature stability. The body of the recycled drum 7 is equipped with a saw gear 21, and the bottom drive motor 22 provides power. The recycled drum is connected to the rollers via trunnion 23. The drive motor 22 rotates the drum along the horizontal axis through the saw gear 21 to ensure uniform internal heating.

[0042] During the heating process, the exhaust gas is collected by the flue gas settling chamber 15, further purified by the condenser dust collector 14, and discharged to the exhaust chimney 12 by the induced draft fan 13, reducing pollutant emissions. The heated milled material enters the temporary storage bin 8 for recycled materials, and then enters the mixing system in proportion through the metering hopper 9 to mix with new aggregates, recycling agents and other additives. The mixing bin 11 uses a twin-shaft mixing arm 10 to improve uniformity.

[0043] The parts not described in detail in this application are prior art, and therefore are not described in detail in this application.

[0044] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0045] Although this document uses a significant amount of technical terminology, the possibility of using other terms is not excluded. These terms are used merely to facilitate the description and explanation of the nature of this application; interpreting them as any additional limitation would be contrary to the spirit of this application.

[0046] This application is not limited to the above-described preferred embodiments. Anyone can derive other products in various forms under the guidance of this application. However, regardless of any changes made to their shape or structure, any technical solution that is the same as or similar to that of this application falls within the protection scope of this application.

Claims

1. A high-content intermittent plant-mixed hot recycling system for asphalt pavement milling aggregate, characterized in that, include: Recycled cold material bin (1) is used to store milling material; A belt conveyor (2) connects the recycled cold material bin (1) and the recycled material elevator (3) to transport milled material to the recycled material elevator (3). The recycling material elevator (3) is arranged vertically and is used to lift the milled material to a preset position and enter the recycling drum (7). The combustion chamber (4) is located to the left of the new aggregate heating drum (6), with a new aggregate inlet (5) arranged at the top and an ignition protection door (16) at the front end, for fuel combustion and providing heat energy; The new aggregate heating drum (6) adopts a direct heating method for heating new aggregates; The recycling drum (7) adopts an indirect heating method and is equipped with thermal resistance steel (18), V-shaped wing plate (17), and adjusting wing plate (19) inside to ensure that the milled material is heated evenly. A temperature sensor (20) is installed on the right end to detect the material temperature. The flue gas settling chamber (15), located below the regeneration drum (7), is used to collect and treat high-temperature waste gas. A condenser dust collector (14) is arranged inside to further purify the flue gas. An induced draft fan (13) is located below the flue gas settling chamber (15) to circulate the flue gas and eventually discharge it through the exhaust chimney; The temporary storage bin (8) for recycled materials is connected to the right side of the recycling drum (7) and is used to store the heated recycled materials. Measuring hopper (9) is connected to the lower part of the temporary storage silo for recycled materials (8) and is used to precisely control the feeding ratio of new aggregate, RAP, recycling agent and new asphalt; The mixing chamber (11) is equipped with a twin-shaft mixing arm (10) to uniformly mix the metered recycled material, new aggregate and recycling agent to finally form recycled asphalt mixture.

2. The high-content intermittent plant-mixed hot recycling system for asphalt pavement milling aggregate according to claim 1, characterized in that, The combustion chamber (4) is equipped with an ignition protection door (16).

3. The high-content intermittent plant-mixed hot recycling system for asphalt pavement milling aggregate according to claim 1, characterized in that, The flue gas settling chamber (15) adopts a negative pressure duct structure.

4. The high-content intermittent plant-mixed hot recycling system for asphalt pavement milling aggregate according to claim 1, characterized in that, The adjustable wing plate (19) of the regenerating drum (7) can be angled to ensure uniform heating of RAP particles of different sizes.

5. The high-content intermittent plant-mixed hot recycling system for asphalt pavement milling aggregate according to claim 1, characterized in that, The mixing chamber (11) adopts a high-efficiency twin-shaft mixing arm (10) to improve the uniformity and construction performance of the recycled mixture.

6. The high-content intermittent plant-mixed hot recycling system for asphalt pavement milling aggregate according to claim 1, characterized in that, A temperature sensor (20) is installed inside the regeneration drum (7).

7. The high-content intermittent plant-mixed hot recycling system for asphalt pavement milling aggregate according to claim 1, characterized in that, The regenerating drum (7) has saw gears (21) arranged at the front and rear of the drum body, and a drive motor (22) arranged at the bottom to make the regenerating drum (7) roll and heat up.

Images