Multi-step oil-stone separation system for asphalt pavement milling material

Abstract

The utility model provides a multi-step oilstone separation system for asphalt pavement milling materials. The multi-step oilstone separation system comprises a feeding bin, a conveying pipeline, a separator, a screening machine, an evaporation tank, a stone color selector and an extraction chamber, the conveying pipeline is connected with the separator, and a dissolving agent inlet is formed in the upper end of the separator; the screening machine is connected to the bottom of the separator, a screen is arranged in the screening machine, and the asphalt milling materials are screened through the screen to obtain asphalt coarse aggregates and asphalt fine aggregates; the stone color sorter is connected to the bottom of the screening machine, an optical sensing module, a separation control module and a separation control execution module are arranged in the stone color sorter, a dark asphalt channel and a light asphalt channel are arranged on the stone color sorter, the dark asphalt channel is connected with the extraction chamber, and the extraction chamber is connected with the evaporation tank. The multi-step oilstone separation system for the asphalt pavement milling materials can effectively improve the separation precision, reduces the energy consumption, is suitable for different types of milling materials, and improves the use value of road regenerated materials.

Description

Technical Field

[0001] This utility model relates to the field of road engineering material recycling, specifically to a multi-step asphalt-aggregate separation system for asphalt pavement milling materials. Background Technology

[0002] With the continuous development of road construction, the demand for maintenance and renovation of old asphalt pavements has increased, generating a large amount of asphalt milling aggregate. Milling aggregate contains old asphalt binder and aggregates (stone), and direct recycling may lead to asphalt aging, reduced bonding performance, and a decline in the performance of fresh asphalt mixtures. Currently, traditional asphalt-aggregate separation methods typically employ single-step heating or chemical solvent separation, but these methods suffer from high energy consumption, incomplete separation, and poor environmental performance. Furthermore, some physical separation methods, such as screening and air classification, are also insufficient to completely remove asphalt residues, affecting the recycling value of the aggregates.

[0003] Currently, various technologies for recycling milled asphalt have been explored both domestically and internationally, including hot recycling, cold recycling, and chemical solvent treatment. Hot recycling softens and separates asphalt through high-temperature heating, but this easily leads to asphalt aging and consumes a lot of energy. Cold recycling, while reducing energy consumption, often requires the addition of new asphalt binder to improve its bonding properties, resulting in higher costs. Chemical solvent treatment methods pose environmental pollution and chemical residue problems. Therefore, existing recycling technologies still have significant room for improvement in terms of efficiency, energy consumption, environmental friendliness, and economics.

[0004] To improve the recycling efficiency of asphalt milling aggregate, it is necessary to develop an efficient, environmentally friendly, and low-energy-consumption asphalt-aggregate separation system to optimize the recycling quality of asphalt binder and aggregate, reduce the use of new materials, and improve the recycling rate of resources. The multi-step asphalt-aggregate separation system proposed in this invention combines various physical and thermal treatment technologies, effectively improving separation accuracy and reducing energy consumption. It is suitable for different types of milling aggregate and enhances the utilization value of road recycled materials. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-step asphalt-aggregate separation system for asphalt pavement milling materials, which can efficiently and environmentally separate asphalt binder and aggregate, and improve the utilization rate of recycled materials.

[0006] To achieve the above objectives, this technical solution provides a multi-step asphalt-aggregate separation system for milled asphalt pavement, including a feeding silo, a conveying pipeline, a separator, a screening machine, an evaporator, an aggregate color sorter, and an extraction chamber. The feeding silo is used to store the milled asphalt material. The conveying pipeline is connected to the separator, and a solvent inlet is provided at the upper end of the separator. The screening machine is connected to the bottom of the separator and is equipped with a screen. The milled asphalt material is screened through the screen to obtain coarse asphalt aggregate and fine asphalt aggregate.

[0007] The stone color sorter is connected to the bottom of the screening machine. The stone color sorter is equipped with an optical sensing module, a separation control module, and a separation control execution module. The stone color sorter is equipped with a dark asphalt channel and a light asphalt channel. The dark asphalt channel is connected to the extraction chamber, and the extraction chamber is connected to the evaporator. The evaporator is equipped with an oil conveying pipe.

[0008] Preferably, a dust collector is also included, which is connected to the right side of the separator.

[0009] Preferably, an asphalt coarse aggregate storage bin is provided on one side of the screening machine, which is used to store the screened asphalt coarse aggregate.

[0010] Preferably, the extraction chamber is equipped with an extractant inlet and a vacuum pump, and a stirring device is installed inside the extraction chamber.

[0011] Preferably, the evaporator is equipped with a coil heater.

[0012] Preferably, a control valve is installed on the dark asphalt channel, and the control valve is connected to the separation control module.

[0013] Preferably, the grease conveying pipeline is made of ceramic fiber.

[0014] Compared with existing technologies, this technical solution has the following characteristics and beneficial effects:

[0015] 1. This invention achieves uniform conveying of milled materials of different particle sizes through the cooperation of the feeding bin and conveying pipeline, avoiding material accumulation or uneven distribution, and ensuring that the separator can function fully. The inclusion of a screening machine further improves the accuracy of material grading, making subsequent color sorting and extraction more targeted, and improving overall separation efficiency.

[0016] 2. This invention utilizes the synergistic effect of an optical sensing module and a separation control module to achieve intelligent identification and sorting of asphalt color; dark and light-colored asphalt enter different recycling channels respectively, ensuring that asphalt of different components can be effectively classified, which helps to optimize the quality of recycled asphalt and enhance the application value of recycled materials;

[0017] 3. This invention utilizes the extract to refine dark asphalt and combines it with an evaporator to recover and reuse the solvent after extraction, reducing the waste of chemical solvents and environmental pollution. At the same time, this system helps to reduce the adverse environmental impact of traditional chemical separation processes, making the separation process more environmentally friendly and sustainable. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of asphalt mixture separation and screening.

[0019] Figure 2This is a schematic diagram of an asphalt mixture oil-stone separation device.

[0020] In the diagram: 1-Feeding bin; 2-Conveying pipe; 3-Separator; 4-Soluble inlet; 5-Dust collector; 6-Screening machine; 7-Asphalt coarse aggregate storage bin; 8-Screen; 9-Drive motor; 10-Separation control module; 11-Optical sensing module; 12-Extractant inlet; 13-Vacuum pump; 14-Evaporator; 15-Oil conveying pipe; 16-Coil; 17-Control valve; 18-Separation control execution module; 19-Light-colored asphalt conveying pipe; 20-Stone color sorter; 21-Extraction chamber. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0022] Those skilled in the art should understand that, in the disclosure of this utility model, 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 utility model 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 utility model.

[0023] 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.

[0024] like Figures 1 to 2As shown, this utility model provides a multi-step asphalt-aggregate separation system for asphalt pavement milling materials, which can efficiently and environmentally separate asphalt binder and aggregate, improving the utilization rate of recycled materials. The system includes a feeding bin 1, a conveying pipe 2, a separator 3, a dust collector 5, a screening machine 6, an asphalt coarse aggregate storage bin 7, an evaporator 14, an aggregate color sorter 20, and an extraction chamber 21. The feeding bin 1 stores the asphalt milling material. The conveying pipe 2 is connected to the separator 3 to transport the asphalt milling material from the feeding bin 1 to the separator 3. The upper end of the separator 3 is equipped with a solvent inlet 4, through which solvent is added to the separator 3 to initially dissolve the asphalt binder in the asphalt milling material. The dust collector 5 is connected to the right side of the separator 3 to remove dust and improve the environmental performance of the system; the screening machine 6 is connected to the bottom of the separator 3. The screening machine 6 is equipped with a screen 8, which is used to perform preliminary screening of the asphalt milling material. After screening, asphalt coarse aggregate and asphalt fine aggregate are obtained. An asphalt coarse aggregate storage bin 7 is set on one side of the screening machine 6. The screened asphalt coarse aggregate is transported to the asphalt coarse aggregate storage bin 7.

[0025] The stone color sorter 20 is connected to the bottom of the screening machine 6. It is equipped with an optical sensing module 11 and a separation control module 10. The stone color sorter 20 is used to separate asphalt according to its color. The stone color sorter 20 is equipped with a dark asphalt channel and a light asphalt channel 19. The dark asphalt channel is connected to the extraction chamber 21. The extraction chamber 21 is connected to the evaporator 14. The evaporator 14 is equipped with an oil conveying pipe 15.

[0026] Extraction chamber 21 is used to extract dark asphalt. Extraction chamber 21 is equipped with extractant inlet 12 and vacuum pump 13. Extractant inlet 12 is used to inject extractant to further purify dark asphalt. The asphalt in dark asphalt dissolves in the extractant to obtain an extraction mixture. The separation efficiency is improved by vacuum pump 13. The extraction mixture enters evaporator 14 for evaporation. After the extractant evaporates, the asphalt product is obtained. The asphalt product is connected to an external recovery chamber through grease conveying pipe 15 for the recovery of dissolved asphalt components.

[0027] Specifically, the separator 3 is made of high-strength alloy material and equipped with a corrosion-resistant coating to improve its service life. The extraction chamber 21 is equipped with a stirring device to improve extraction and dissolution efficiency. The extraction chamber 21 is connected to a vacuum pump 13, which reduces the pressure in the extraction chamber 21, thereby lowering the asphalt volatilization temperature and improving recovery efficiency. A coil heater 16 is arranged inside the evaporator 14 to heat the substances inside the evaporator, promoting the evaporation of the extractant. The separation control module 10 separates asphalt of different colors based on detection commands from the optical sensing module 11. Dark asphalt flows to the extraction chamber 21, while light-colored asphalt is separated and collected in the light-colored asphalt channel 19 at the other end.

[0028] The operating steps of the multi-step asphalt-aggregate separation system for asphalt pavement milling materials are as follows:

[0029] The asphalt milling material in the feed hopper 1 enters the separator 3 through the conveying pipe 2. Asphalt solvent enters the separator 3 through the solvent inlet 4. The asphalt solvent dissolves the asphalt components in the asphalt milling material, promoting the separation of asphalt from the coarse aggregate. A dust collector 5 is connected to the right side of the separator 3, reducing dust pollution during processing. After separation by the separator 3, the asphalt milling material enters the screening machine 6. The screening machine 6 uses mechanical vibration to screen the asphalt milling material. The screened coarse aggregate enters the asphalt coarse aggregate storage hopper 7 from the right side of the screening machine 6, while the fine aggregate enters the stone color sorter 20 through the bottom channel at the lower end of the screening machine 6. The optical sensing module 11 inside the stone color sorter 20 is used to distinguish the color of asphalt blocks. The optical sensing module 11... The separation signal is transmitted to the separation control module 10. The separation control module 10 drives the separation control execution module 18 to operate by controlling the motor 9. The separation control execution module 18 separates the light and dark asphalt. The dark asphalt enters the extraction chamber 21 on the right. The extraction chamber 21 contains the extraction liquid. The extraction chamber 21 is connected to the outside of the extraction chamber 21. The extraction efficiency is improved by reducing the vacuum pressure. The asphalt components in the dark asphalt dissolve in the extraction liquid and obtain the extraction mixture. After the extraction is completed, the extraction mixture enters the evaporator 14 on the right. The extraction mixture is heated by the coil heater 16 in the evaporator 14 to evaporate the extractant in the extraction mixture. After evaporation, the asphalt product is obtained. The asphalt product is output through the oil conveying pipe 15 on the right, realizing the separation of oil and stone.

[0030] The stone color sorter 20 used in this embodiment adopts existing technology, and can be found in the invention patent with publication number CN107520145A and invention name "Wet Ore Color Sorter".

[0031] A control valve 17 is installed on the dark asphalt channel. The control valve 17 is connected to the separation control module 10. When the separation control module receives a detection signal indicating the presence of dark asphalt, the control valve 17 opens to allow the dark asphalt to enter the extraction chamber 21, thereby achieving automated control of the system. The grease conveying pipeline 15 is made of high-temperature resistant material to ensure the stability of asphalt transmission. In this embodiment, the grease conveying pipeline 15 is a ceramic fiber pipeline.

[0032] This utility model is not limited to the above-described preferred embodiments. Anyone can derive other forms of products under the guidance of this utility model. However, regardless of any changes made in their shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this utility model.

Claims

1. A multi-step asphalt-aggregate separation system for asphalt pavement milling materials, characterized in that, It includes a feeding bin (1), a conveying pipe (2), a separator (3), a screening machine (6), an evaporator (14), a stone color sorter (20), and an extraction chamber (21); the feeding bin (1) is used to store asphalt milling material, the conveying pipe (2) is connected to the separator (3), and the upper end of the separator (3) is provided with a solvent inlet (4); the screening machine (6) is connected to the bottom of the separator (3), and a screen (8) is provided inside the screening machine (6) to screen the asphalt milling material and obtain asphalt coarse aggregate and asphalt fine aggregate; The stone sorter (20) is connected to the bottom of the screening machine (6). The stone sorter (20) is equipped with an optical sensing module (11), a separation control module (10), and a separation control execution module (18). The stone sorter (20) is equipped with a dark asphalt channel and a light asphalt channel (19). The dark asphalt channel is connected to the extraction chamber (21). The extraction chamber (21) is connected to the evaporator (14). The evaporator (14) is equipped with an oil conveying pipe (15).

2. The multi-step asphalt-aggregate separation system for asphalt pavement milling material according to claim 1, characterized in that, It also includes a dust collector (5), which is connected to the right side of the separator (3).

3. The multi-step asphalt-aggregate separation system for asphalt pavement milling material according to claim 1, characterized in that, A coarse asphalt aggregate storage bin (7) is provided on one side of the screening machine (6), which is used to store the coarse asphalt aggregate screened out.

4. The multi-step asphalt-aggregate separation system for asphalt pavement milling material according to claim 1, characterized in that, The extraction chamber (21) is equipped with an extractant inlet (12) and a vacuum pump (13), and a stirring device is provided inside the extraction chamber (21).

5. The multi-step asphalt-aggregate separation system for asphalt pavement milling material according to claim 1, characterized in that, The evaporator (14) is equipped with a coil heater (16).

6. The multi-step asphalt-aggregate separation system for asphalt pavement milling material according to claim 1, characterized in that, A control valve (17) is installed on the dark asphalt channel, and the control valve (17) is connected to the separation control module (10).

7. The multi-step asphalt-aggregate separation system for asphalt pavement milling material according to claim 1, characterized in that, The grease delivery pipe (15) is made of ceramic fiber.

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