Indoor simulation preparation device for oil-rich RAP fine mortar

Abstract

The invention discloses an oil-rich RAP fine mortar indoor simulation preparation device, and relates to the technical field of asphalt regeneration, the oil-rich RAP fine mortar indoor simulation preparation device comprises an asphalt regeneration tank, the top of the asphalt regeneration tank is provided with a feed inlet, and the asphalt regeneration tank is filled with a new asphalt material and an old asphalt material; the stirring mechanism is arranged in the asphalt regeneration tank; the ultrasonic output end of the ultrasonic dispersion mechanism is arranged in the asphalt regeneration tank, and the ultrasonic output end and the stirring mechanism are arranged at an interval; the heating mechanism is arranged on the inner surface of the asphalt regeneration tank; and the temperature control mechanism is electrically connected with the heating mechanism and can adjust the temperature in the asphalt regeneration tank. The blending degree of the aged asphalt on the surface of the RAP fine material and the new asphalt material is improved by heating and forced stirring, and meanwhile, the blending effect of the new asphalt and the old asphalt is enhanced and accelerated through the vibration and cavitation action of the ultrasonic dispersion mechanism, so that 100% rapid fusion of the new asphalt and the old asphalt can be realized, and efficient recycling of the RAP fine material is realized.

Description

Technical Field

[0001] The invention relates to the technical field of asphalt regeneration, and in particular to an indoor simulation preparation device for oil-rich RAP fine material mortar. Background Art

[0002] RAP is the abbreviation of "Reclaimed Asphalt Pavement", which means "recycled asphalt pavement material", usually refers to waste asphalt pavement material generated during road repair, maintenance or reconstruction.

[0003] The recycling of RAP is of great significance, mainly reflected in the following aspects:

[0004] Reduce resource waste: RAP contains reusable ingredients such as asphalt and aggregates. Recycling can reduce the demand for new asphalt and aggregates and reduce the exploitation of natural resources.

[0005] Reduce construction costs: Using RAP can save the procurement cost of raw materials.

[0006] Protect the environment: avoid the accumulation of large amounts of waste asphalt pavement materials and reduce environmental pollution.

[0007] At present, the recycling of RAP still has the status of "three lows", namely "low RAP dosage", "low structural layer" and "low road grade", and the large-volume, high-quality recycling of RAP has not yet been realized. There are two main restrictive factors. First, the variability of RAP agglomerates is large and it is difficult to disperse evenly. The source of RAP is complex and the agglomeration is significant. The bonding effect of asphalt makes it difficult for RAP to be effectively crushed and screened, resulting in large variability of recycled asphalt mixtures and uneven distribution of aggregates; second, the degree of fusion between the aged asphalt and the recycled materials in RAP is low, and it cannot be fully regenerated and restored. The aged asphalt in RAP is dispersed and wrapped on the surface of the stone. During production and mixing, the contact area of ​​the aged asphalt with the new asphalt and the regeneration agent is very limited, and the fusion state is extremely uneven. A weak adhesion interface is easily generated inside the binder, thereby reducing the road performance and durability of the recycled asphalt mixture.

[0008] In view of the above problems, fine separation technology is usually used to solve them. For example, patent CN219315419U discloses a fine separation and regeneration stirring device for asphalt milling materials. This technology adopts physical centrifugal separation and multi-point driven high-frequency excitation screening technology to achieve the stripping and precise grading of coarse aggregate and asphalt mortar. After fine separation, the stripping effect of RAP coarse aggregate (particle size>3mm) is obvious, the asphalt content is less than 2%, the false particle content is less than 10%, the variability is greatly reduced, and it can be evenly dispersed in the recycled asphalt mixture, and can be used instead of new aggregate.

[0009] However, the RAP fines (particle size 0-3 mm) peeled off from the surface of RAP coarse aggregate exist in the form of asphalt and fine aggregate agglomerates, with an asphalt content of up to 7%-10%, which is difficult to fully regenerate after heating. As a result, the RAP fines are usually disposed of together with the RAP coarse aggregate, resulting in a large amount of asphalt waste.

[0010] In view of this, how to provide a RAP recycling device that can efficiently recycle RAP fines is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0011] The purpose of the present invention is to provide an indoor simulation preparation device for oil-rich RAP fine material mortar to solve the problems existing in the prior art and achieve full fusion of aged asphalt and new asphalt on the surface of oil-rich RAP fine material, thereby achieving efficient recycling of RAP fine material.

[0012] To achieve the above object, the present invention provides the following solution: The present invention provides an indoor simulation preparation device for oil-rich RAP fine material mortar, comprising:

[0013] An asphalt regeneration tank, wherein the top of the asphalt regeneration tank is provided with a feed port, and the asphalt regeneration tank is filled with new asphalt and old asphalt;

[0014] A stirring mechanism, wherein the stirring mechanism is arranged in the asphalt regeneration tank;

[0015] An ultrasonic dispersion mechanism, wherein the ultrasonic output end of the ultrasonic dispersion mechanism is arranged in the asphalt regeneration tank and is spaced apart from the stirring mechanism;

[0016] A heating mechanism, the heating mechanism being arranged on the inner surface of the asphalt regeneration tank;

[0017] A temperature control mechanism is electrically connected to the heating mechanism and is capable of adjusting the temperature inside the asphalt regeneration tank.

[0018] Furthermore, the stirring mechanism comprises:

[0019] A driving motor, the driving motor is fixedly arranged at the front end of the asphalt regeneration tank, there are two driving motors, and the two driving motors are symmetrically arranged up and down;

[0020] A screw shaft assembly is provided with a plurality of stirring blades evenly spaced apart from each other, a power input end of the screw shaft assembly is fixedly connected to an output end of the driving motor via a coupling, and the screw shaft assemblies corresponding to the two driving motors are arranged in parallel up and down.

[0021] Furthermore, the ultrasonic dispersion mechanism comprises:

[0022] A titanium alloy vibrating rod is vertically arranged in the asphalt regeneration tank and spaced apart from the stirring blade; the top end of the titanium alloy vibrating rod penetrates the asphalt regeneration tank and extends to the outside, and the top end of the titanium alloy vibrating rod is electrically connected to the ultrasonic disperser through a variable amplitude rod, an industrial vibrator, and a transducer in sequence.

[0023] Furthermore, the heating mechanism is an oil bath heating component, and the oil bath heating component is embedded in the inner surface of the asphalt regeneration tank.

[0024] Furthermore, the temperature control mechanism comprises:

[0025] A temperature sensor, wherein the temperature sensor is disposed on the asphalt regeneration tank, and a sensing end of the temperature sensor extends into the asphalt regeneration tank;

[0026] A control center, the control center is electrically connected to the temperature sensor, the oil bath heating assembly, the drive motor and the ultrasonic disperser respectively;

[0027] The temperature sensor can monitor the temperature inside the asphalt regeneration tank and transmit the temperature data to the control center. The control center can control the output power of the oil bath heating component according to the temperature data transmitted by the temperature sensor. The control center can control the output speed of the drive motor and the output frequency of the ultrasonic disperser.

[0028] Furthermore, it also includes a display screen, which is arranged on the outer shell of the asphalt regeneration tank, and the display screen is electrically connected to the control center. The display screen can display the tank temperature inside the asphalt regeneration tank, the output speed of the drive motor and the output frequency of the ultrasonic disperser.

[0029] Furthermore, the temperature sensor and the titanium alloy vibration rod are respectively located on the left and right sides of the feed port.

[0030] Furthermore, the output speed of the driving motor is 200-800RPM, and the output frequency of the ultrasonic disperser is 210-30HZ.

[0031] The present invention discloses the following technical effects:

[0032] 1. Heating and forced stirring are used to improve the blending degree of aged asphalt on the surface of RAP fine material and new asphalt. At the same time, the vibration and cavitation of the ultrasonic dispersion mechanism are used to accelerate the blending effect of new and old asphalt, which can achieve 100% rapid fusion of new and old asphalt and realize efficient recycling of RAP fine material.

[0033] 2. The stirring mechanism consists of two sets of drive motors and screw shaft assemblies arranged in parallel up and down. Through continuous stirring up and down, the blending speed of new and old asphalt can be accelerated and the blending effect can be improved.

[0034] 3. The control center is electrically connected to the temperature sensor, oil bath heating component, drive motor and ultrasonic disperser respectively; the temperature sensor can monitor the temperature inside the asphalt regeneration tank and transmit the temperature data to the control center, the control center can control the output power of the oil bath heating component according to the temperature data transmitted by the temperature sensor, and the control center can control the output speed of the drive motor and the output frequency of the ultrasonic disperser. The control center can realize the intelligent, digital and automated blending of new and old asphalt. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0037] Figure 2 This is a front cross-sectional view of an asphalt regeneration tank (the feed port is not shown);

[0038] Figure 3 It is the control flow chart of the control center;

[0039] Among them, 1. Asphalt regeneration tank; 101. Feed port; 2. Drive motor; 3. Screw shaft assembly; 4. Stirring blade; 5. Coupling; 6. Titanium alloy vibrating rod; 7. Ultrasonic disperser; 8. Oil bath heating component; 9. Temperature sensor; 901. Sensing end; 10. Control center; 11. Display screen. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] Example 1

[0043] The embodiment of the present invention provides an indoor simulation preparation device for oil-rich RAP fine material mortar, wherein the asphalt regeneration tank 1 is a cylindrical tank body (30 cm long and 20 cm in diameter), sealed at both ends, with a feed port 101 on the top, and a switchable cover body is provided on the feed port 101 to control the opening and closing of the feed port 101, and the asphalt regeneration tank 1 is filled with new asphalt and old asphalt, and the asphalt regeneration tank 1 is used to blend new and old asphalt. The stirring mechanism is arranged in the asphalt regeneration tank 1; the ultrasonic output end of the ultrasonic dispersion mechanism is arranged in the asphalt regeneration tank 1 and is arranged at intervals from the stirring mechanism; the heating mechanism is arranged on the inner surface of the asphalt regeneration tank 1; the temperature control mechanism is electrically connected to the heating mechanism and can adjust the temperature in the asphalt regeneration tank 1.

[0044] In this embodiment, the stirring mechanism includes: a drive motor 2, which is fixedly arranged at the front end of the asphalt regeneration tank 1, and there are two drive motors 2, which are symmetrically arranged up and down; a screw shaft assembly 3, on which a plurality of stirring blades 4 are evenly spaced, and the power input end of the screw shaft assembly 3 is fixedly connected to the output end of the drive motor 2 through a coupling 5, and the screw shaft assemblies 3 corresponding to the two drive motors 2 are arranged in parallel up and down.

[0045] In this embodiment, the ultrasonic dispersion mechanism includes: a titanium alloy vibrating rod 6, which is vertically arranged in the asphalt regeneration tank 1 and spaced from the stirring blade 4, and the two do not interfere with each other; the top of the titanium alloy vibrating rod 6 penetrates the asphalt regeneration tank 1 and extends to the outside, and the top of the titanium alloy vibrating rod 6 is electrically connected to the ultrasonic disperser 7 through the horn, the industrial vibrator, and the transducer in turn. The titanium alloy vibrating rod 6 is usually able to work stably in a complex working environment due to its good mechanical properties and corrosion resistance, and effectively transfers ultrasonic energy to the material to be dispersed. The transducer is a key component for realizing the mutual conversion between electrical energy and mechanical energy. It converts the input electrical energy into mechanical vibration energy, thereby providing a power source for the entire system. The industrial vibrator is the core element for generating vibration, and its vibration frequency and amplitude directly affect the effect of ultrasonic dispersion. The horn plays the role of amplifying the amplitude, and can amplify the small amplitude vibration from the vibrator to enhance the effect of ultrasonic dispersion. These components work together to enable the ultrasonic dispersion system to effectively disperse and homogenize the material.

[0046] In this embodiment, the heating mechanism is an oil bath heating assembly 8, and the oil bath heating assembly 8 is embedded in the inner surface of the asphalt regeneration tank 1. The oil bath heating assembly 8 includes the following main parts: Heating container: made of high temperature resistant and corrosion resistant materials, such as stainless steel or glass, used to contain heat transfer oil. In this embodiment, the heating container forms a circulating oil circuit and is arranged on the inner surface of the asphalt regeneration tank 1. Heat transfer oil: It has good thermal stability and thermal conductivity, and can transfer heat evenly. The heat transfer oil circulates in the circulating oil circuit to heat the new and old asphalt inside. Heating element: The heating element is a resistance wire, a heating rod or a heating tube, etc., which generates heat by powering on to heat the heat transfer oil.

[0047] In this embodiment, the temperature control mechanism includes: a temperature sensor 9, which is arranged on the asphalt regeneration tank 1, and the temperature sensor 9 and the titanium alloy vibrating rod 6 are respectively located on the left and right sides of the feed port 101, and the sensing end 901 thereof extends into the asphalt regeneration tank 1; a control center 10, which is electrically connected to the temperature sensor 9, the oil bath heating component 8, the drive motor 2 and the ultrasonic disperser 7; the temperature sensor 9 can monitor the temperature inside the asphalt regeneration tank 1 and transmit the temperature data to the control center 10, and the control center 10 can control the output power of the oil bath heating component 8 according to the temperature data transmitted by the temperature sensor 9, and the control center 10 can control the output speed of the drive motor 2 and the output frequency of the ultrasonic disperser 7. A display screen 11 is arranged on the outer shell of the asphalt regeneration tank 1, and the display screen 11 is electrically connected to the control center 10, and the display screen 11 can display the temperature inside the asphalt regeneration tank 1, the output speed of the drive motor 2 and the output frequency of the ultrasonic disperser 7.

[0048] The specific working process is as follows:

[0049] 1. Sample Preparation

[0050] The oil-rich RAP fine material (old asphalt material) was placed in a 135°C oven and kept at a preset temperature for 4 hours. At the same time, the 70# sample asphalt (new asphalt material) was heated to 165°C to make the asphalt sample flowable.

[0051] 2. Sample preparation

[0052] 80% of the oil-rich RAP fine material was added to the 165°C sample asphalt. The surface oil-stone ratio of the oil-rich RAP fine material was 13%, so the ratio of new and old asphalt was 2:1.

[0053] 3. Heating, forced stirring and ultrasonic dispersion treatment

[0054] Place the new and old asphalt mixed sample in step 2 into the asphalt regeneration tank 1, maintain 165°C, set the output speed of the drive motor 2 to 200RPM, the output frequency of the ultrasonic disperser 7 to 0, and take out the mixed asphalt after 15 minutes.

[0055] Example 2

[0056] The difference between this embodiment and embodiment 1 is that the new and old asphalt mixed sample in step 2 is placed in the asphalt regeneration tank 1, maintained at 165°C, the output speed of the drive motor 2 is set to 400RPM, the output frequency of the ultrasonic disperser 7 is set to 10, and the mixed asphalt is taken out after 15 minutes.

[0057] Example 3

[0058] The difference between this embodiment and embodiment 1 is that the new and old asphalt mixed sample in step 2 is placed in the asphalt regeneration tank 1, maintained at 165°C, the output speed of the drive motor 2 is set to 600RPM, the output frequency of the ultrasonic disperser 7 is set to 20, and the mixed asphalt is taken out after 15 minutes.

[0059] Example 4

[0060] The difference between this embodiment and embodiment 1 is that the new and old asphalt mixed sample in step 2 is placed in the asphalt regeneration tank 1, maintained at 165°C, the output speed of the drive motor 2 is set to 800RPM, the output frequency of the ultrasonic disperser 7 is set to 30, and the mixed asphalt is taken out after 15 minutes.

[0061] Example 5

[0062] The difference between this embodiment and embodiment 1 is that the new and old asphalt mixed sample in step 2 is placed in the asphalt regeneration tank 1, maintained at 165°C, the output speed of the drive motor 2 is set to 800RPM, the output frequency of the ultrasonic disperser 7 is set to 0, and the mixed asphalt is taken out after 15 minutes.

[0063] Example 6

[0064] The difference between this embodiment and embodiment 1 is that the new and old asphalt mixed sample in step 2 is placed in the asphalt regeneration tank 1, maintained at 165°C, the output speed of the drive motor 2 is set to 600RPM, the output frequency of the ultrasonic disperser 7 is set to 10, and the mixed asphalt is taken out after 15 minutes.

[0065] Example 7

[0066] The difference between this embodiment and embodiment 1 is that the new and old asphalt mixed sample in step 2 is placed in the asphalt regeneration tank 1, maintained at 165°C, the output speed of the drive motor 2 is set to 400RPM, the output frequency of the ultrasonic disperser 7 is set to 30, and the mixed asphalt is taken out after 15 minutes.

[0067] Example 8

[0068] The difference between this embodiment and embodiment 1 is that the new and old asphalt mixed sample in step 2 is placed in the asphalt regeneration tank 1, maintained at 165°C, the output speed of the drive motor 2 is set to 200RPM, the output frequency of the ultrasonic disperser 7 is set to 30, and the mixed asphalt is taken out after 15 minutes.

[0069] A bending beam rheological test was conducted on the mixed asphalt of Examples 1 to 8 (it was immediately placed in a -20°C freezer for curing after film casting to prevent further activation of the aged asphalt on the RAP surface). The experimental results were used to evaluate the degree of mixing of the new and old asphalts. The evaluation index was the S value. The closer the S value was to the completely fused control group, the better the fusion effect. The control group was: the 0-3mm oil-rich RAP fine material was tested after extraction, and the 70# asphalt recovered after extraction was completely melted and mixed with the aged asphalt in a ratio of 2:1, and then the regenerated asphalt mortar was prepared with the extracted aggregate. The regenerated asphalt mortar can be considered to be a complete mixture of the new and old asphalts, and its S value is the standard value. The S value measurement results of each embodiment and the control group are as follows:

[0070]

[0071] It can be seen from the above table that, except for Example 1, the S values ​​measured in Examples 2 to 7 are all close to the S value of the control group. Affected by the experimental error, the S values ​​of Examples 1 to 8 cannot be completely equal to the control group. According to the actual test results and the above S values, it can be considered that the method disclosed in Examples 2 to 8 can achieve a 100% blending degree of new and old asphalt, among which Example 4 has the best blending effect.

[0072] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0073] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An indoor simulation preparation device for oil-rich RAP fine material mortar, characterized in that: include: asphalt A regeneration tank (1), wherein the top of the asphalt regeneration tank (1) is provided with a feed port (101), and the asphalt regeneration tank (1) is filled with new asphalt and old asphalt; A stirring mechanism, wherein the stirring mechanism is arranged in the asphalt regeneration tank (1); An ultrasonic dispersion mechanism, wherein the ultrasonic output end of the ultrasonic dispersion mechanism is arranged in the asphalt regeneration tank (1) and is spaced apart from the stirring mechanism; A heating mechanism, the heating mechanism being arranged on the inner surface of the asphalt regeneration tank (1); A temperature control mechanism is electrically connected to the heating mechanism and is capable of adjusting the temperature inside the asphalt regeneration tank (1).

2. The indoor simulation preparation device for oil-rich RAP fine material mortar according to claim 1 is characterized in that: The stirring mechanism comprises: A driving motor (2), the driving motor (2) being fixedly arranged at the front end of the asphalt regeneration tank (1), and there are two driving motors (2), and the two driving motors (2) are symmetrically arranged up and down; A screw shaft assembly (3), wherein a plurality of stirring blades (4) are evenly spaced apart on the screw shaft assembly (3), a power input end of the screw shaft assembly (3) is fixedly connected to an output end of the drive motor (2) via a coupling (5), and the screw shaft assemblies (3) corresponding to the two drive motors (2) are arranged in parallel up and down.

3. The indoor simulation preparation device for oil-rich RAP fine material mortar according to claim 2 is characterized in that: The ultrasonic dispersion mechanism comprises: A titanium alloy vibrating rod (6), wherein the titanium alloy vibrating rod (6) is vertically arranged in the asphalt regeneration tank (1) and is spaced apart from the stirring blade (4); the top end of the titanium alloy vibrating rod (6) passes through the asphalt regeneration tank (1) and extends to the outside, and the top end of the titanium alloy vibrating rod (6) is electrically connected to the ultrasonic disperser (7) in sequence through a variable amplitude rod, an industrial vibrator, and a transducer.

4. The indoor simulation preparation device for oil-rich RAP fine material mortar according to claim 3 is characterized in that: The heating mechanism is an oil bath heating component (8), and the oil bath heating component (8) is embedded in the inner surface of the asphalt regeneration tank (1).

5. The indoor simulation preparation device for oil-rich RAP fine material mortar according to claim 4, characterized in that: The temperature control mechanism comprises: A temperature sensor (9), the temperature sensor (9) being arranged on the asphalt regeneration tank (1), and the sensing end (901) of the temperature sensor extending into the asphalt regeneration tank (1); A control center (10), wherein the control center (10) is electrically connected to the temperature sensor (9), the oil bath heating assembly (8), the drive motor (2) and the ultrasonic disperser (7); The temperature sensor (9) is capable of monitoring the temperature inside the asphalt regeneration tank (1) and transmitting the temperature data to the control center (10). The control center (10) is capable of controlling the output power of the oil bath heating component (8) according to the temperature data transmitted by the temperature sensor (9). The control center (10) is capable of controlling the output speed of the drive motor (2) and the output frequency of the ultrasonic disperser (7).

6. The indoor simulation preparation device for oil-rich RAP fine material mortar according to claim 5, characterized in that: It also includes a display screen (11), which is arranged on the outer shell of the asphalt regeneration tank (1), and the display screen (11) is electrically connected to the control center (10). The display screen (11) can display the temperature inside the asphalt regeneration tank (1), the output speed of the drive motor (2), and the output frequency of the ultrasonic disperser (7).

7. The indoor simulation preparation device for oil-rich RAP fine material mortar according to claim 5, characterized in that: The temperature sensor (9) and the titanium alloy vibration rod (6) are respectively located on the left and right sides of the feed port (101).

8. The indoor simulation preparation device for oil-rich RAP fine material mortar according to claim 5, characterized in that: The output speed of the driving motor (2) is 200-800RPM, and the output frequency of the ultrasonic disperser (7) is 10-30HZ.

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