A preparation device for recycled asphalt mixture

Abstract

A preparation device for recycled asphalt mixture, comprising a first batching component, a second batching component, a third batching component, a hot air drying component, a microwave drying component and a second mixing component; the first batching component, the hot air drying component, the microwave drying component and the second mixing component are connected in sequence; the second batching component is connected with the microwave drying component; the third batching component is connected with the second mixing component; the particle size of the RAP material in the first batching component is larger than that of the RAP material in the second batching component. In this device, the RAP coarse material passes through two-stage drying components, namely the hot air drying component and the microwave drying component, and the fine material passes through the microwave drying component. The device is reasonably designed, effectively avoiding the heat aging and coking of the RAP fine material directly entering the hot air drying component, solving the problem of sticky material of the RAP fine material in the hot air drying component, improving the working efficiency of the existing microwave hot recycling asphalt mixing plant, and ensuring the existing operation safety.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt concrete mixing plant equipment, and particularly to a device for preparing recycled asphalt mixture. Background Art

[0002] Factory-mixed hot recycled asphalt mixing plants are becoming increasingly common in China. The core equipment of the recycled mixing plant is the hot recycled drying drum, which is a key component for heating recycled asphalt mixture (RAP). The traditional hot recycled drying drum heats the mixed RAP material in the drum. Since hot air or open fire is used for external heating of the RAP material, the fine materials in the RAP material rise in temperature relatively quickly and are easily heated first, resulting in the aging and coking of the asphalt in the fine materials, generating a large amount of asphalt fumes and polluting the environment. In extreme cases, safety accidents such as combustion and explosion may be triggered. At the same time, when the fine materials reach a certain temperature, the adhesion of the asphalt in them is relatively strong, and it is easy to adhere to the inner wall of the drying drum. The problem of the drying drum sticking with materials has a great negative impact on the factory-mixed hot recycled mixing equipment and requires regular manual cleaning. This not only affects production, but also is time-consuming and laborious, and poses a great hidden danger to the personal safety of workers. The prior art proposes to add microwave heating equipment on the basis of the traditional recycled mixing plant to perform secondary temperature increase on the RAP material, that is, the RAP material heated to 120°C in the hot recycled drying drum then enters the microwave bin. Since the microwave directly acts on the aggregate in the aggregate, the heated aggregate then heats the asphalt wrapped outside. After secondary microwave heating, the RAP material can be directly heated to 160°C - 170°C, solving the problem of low blending ratio of recycled asphalt mixture due to temperature reasons. Although microwave heating can greatly increase the blending ratio of the RAP material, from the current 30% to 80% or even higher. However, according to the test results of the laboratory, in the case of an 85% blending ratio, the proportion of 0 - 5mm RAP fine materials is 18% or even higher, accounting for about 21% in the whole RAP material. This will inevitably cause the problem of more serious material sticking in the hot recycled drying drum. Summary of the Invention

[0003] Aiming at the problems existing in the prior art, the present invention provides a device for preparing recycled asphalt mixture.

[0004] The present invention is realized through the following technical solutions:

[0005] A device for preparing recycled asphalt mixture includes a first batching component, a second batching component, a third batching component, a hot air drying component, a microwave drying component, and a second mixing component;

[0006] The first batching component, the hot air drying component, the microwave drying component, and the second mixing component are connected in sequence;

[0007] The second batching component is connected to the microwave drying component;

[0008] The third batching component is connected to the second mixing component;

[0009] The particle size of the RAP material in the first batching component is larger than that of the RAP material in the second batching component.

[0010] Preferably, the preparation device further includes a first transmission component and a second transmission component; one end of the first transmission component is connected to the outlet end of the first batching component, and the other end is connected to the inlet end of the hot air drying component; one end of the second transmission component is connected to the outlet end of the second batching component, and the other end is connected to the inlet end of the microwave drying component.

[0011] Preferably, the first transmission component and the second transmission component are lifting transmission components.

[0012] Preferably, the preparation device further includes a first storage component, a first metering component, and a first mixing component, which are connected in sequence and are arranged between the microwave drying component and the second mixing component.

[0013] Preferably, the first storage component is located directly below the microwave drying component.

[0014] Preferably, the first metering component is located directly below the first storage component.

[0015] Preferably, the first mixing component is located directly below the first metering component.

[0016] Preferably, several openings are further provided at the top of the first mixing component.

[0017] Preferably, a second metering component is provided inside the third batching component.

[0018] Preferably, the preparation device further includes a second storage component, and the inlet end of the second storage component is connected to the outlet end of the second mixing component.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] A preparation device for recycled asphalt mixture is provided with a first batching component and a second batching component respectively used for preparing coarse materials and fine materials. The coarse materials pass through two-stage drying components, namely a hot air drying component and a microwave drying component, and the fine materials pass through the microwave drying component. The device is configured with a third batching component, which produces new materials for blending with RAP materials. The device is reasonably designed, effectively avoiding the direct entry of RAP fine materials into the hot air drying component to be thermally aged and coked, solving the problem of sticky materials of RAP fine materials in the hot air drying component, improving the working efficiency of the existing microwave hot recycling asphalt mixing plant, and ensuring the existing operation safety.

[0021] Furthermore, the first transfer component and the second transfer component are lifting transfer components, which can lift the RAP waste materials to a corresponding height, facilitating the development of the next-stage work and making the operation more convenient.

[0022] Furthermore, the first storage component, the first metering component, and the first mixing component are connected in sequence and are arranged between the second drying component and the second mixing component. The first storage component can achieve temporary storage before the mixing of hot RAP materials and new materials. The first metering component can achieve intermittent weighing to ensure metering accuracy and accurately weigh the required hot RAP materials for mixing in real time according to the set design target value. The first mixing component can achieve preliminary stirring and mixing of the hot RAP materials.

[0023] Furthermore, the first storage component is located directly below the second drying component, facilitating the transfer of the hot RAP materials into the next working component.

[0024] Furthermore, the first metering component is located directly below the first storage component, facilitating the transfer of the hot RAP materials into the next working component.

[0025] Furthermore, the first mixing component is located directly below the first metering component to receive the hot RAP materials unloaded from the first metering component.

[0026] Furthermore, several openings are provided at the top of the first mixing component for the addition of admixtures, so as to achieve the function of adding a certain amount of regenerant as required during the stirring and mixing process.

[0027] Furthermore, a second metering component is provided inside the third batching component, which can make the new and old material metering bins cooperate with each other to achieve the purpose of accurately controlling the mixing ratio of the new and old materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 It is a schematic structural diagram of the present invention.

[0030] In the figure: 11, the first batching component; 12, the second batching component; 13, the third batching component; 21, the first transfer component; 22, the second transfer component; 31, the hot air drying component; 32, the microwave drying component; 4, the first storage component; 5, the first metering component; 6, the first mixing component; 7, the second mixing component; 8, the second storage component. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0034] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, terms such as "first" and "second" are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0035] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0036] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly defined and limited, if terms such as "set", "installed", "connected", "connected" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0037] After analysis, the smaller the particle size of RAP, the larger its specific surface area. For example, the specific surface area of the old material with a particle size of 5 mm is 5 times that of the old material with a particle size of 25 mm. Under the same temperature difference condition, due to the large specific surface area and high heat transfer coefficient of RAP fine materials, the time required for hot air to heat RAP coarse materials is more than ten times or even dozens of times the time required to heat RAP fine materials. Therefore, the larger the proportion of fine materials in the recycled RAP old materials, the larger the specific surface area. It is easy for RAP fine materials to be heated to too high a temperature and age, thus exacerbating the problem of sticky materials. Accordingly, the RAP fine materials of 0 - 5 mm and the RAP medium - coarse materials can be heated separately. Among them, the RAP medium - coarse materials still enter the hot air drying cylinder for heating, and after being heated to 120 °C, they enter the microwave heating box. The RAP fine materials are lifted by a separate elevator to the microwave bin for heating. The normal - temperature fine materials are evenly spread on the heated RAP medium - coarse materials according to the laboratory mix ratio and then enter the microwave bin for heating. The RAP materials are directly heated to the specified temperature by microwaves to complete the heating of the entire RAP materials. Since the proportion of fine materials in the RAP old materials is greatly reduced, the aging phenomenon of waste asphalt in the hot - recycling drying cylinder is greatly reduced, thus solving the problem of sticky materials in the hot - recycling drying cylinder.

[0038] The following further describes the present invention in detail with reference to the accompanying drawings:

[0039] As Figure 1 shown, a device for preparing recycled asphalt mixture includes a first batching component 11, a second batching component 12, a third batching component 13, a first transmission component 21, a second transmission component 22, a hot - air drying component 31, a microwave drying component 32, a first storage component 4, a first metering component 5, a first mixing component 6, a second mixing component 7, and a second storage component 8. The first batching component 11, the first transmission component 21, the hot - air drying component 31, the microwave drying component 32, the first storage component 4, the first metering component 5, the first mixing component 6, the second mixing component 7, and the second storage component 8 are connected in sequence through their respective inlet ends and outlet ends; the second batching component 12, the second transmission component 22, and the microwave drying component 32 are connected in sequence through their respective inlet ends and outlet ends; the outlet end of the third batching component 13 is connected to the inlet end of the second mixing component 7.

[0040] The first transfer component 21 and the second transfer component 22 can adopt a lifting transfer component, which can lift the old materials to a corresponding height, laying a foundation for the next stage of work, facilitating the subsequent transfer of materials, and effectively controlling costs. The first storage component 4 is located directly below the microwave drying component 32, temporarily storing the heated and dried hot RAP materials in the silo, and discharging the aggregated materials into the next silo through the opening and closing of the hydraulic switch. The first metering component 5 is located directly below the first storage component 4. The metering bin can achieve intermittent weighing, ensuring the metering accuracy, and weighing the hot RAP materials required for mixing in real time and accurately according to the set design target value. The first mixing component 6 is located directly below the first metering component 5 to receive the hot RAP materials unloaded from the first metering component 5. The surface of the first mixing component 6 is provided with an additive addition port, which can realize the function of adding a certain amount of regenerant according to requirements during the stirring process.

[0041] The third batching component 13 is a mixing device of a conventional asphalt mixing plant. Its main function is to produce new materials for blending with RAP materials. The new material mixing device is equipped with a metering device, and the new and old material metering bins cooperate with each other to achieve the purpose of accurately controlling the blending ratio of new and old materials.

[0042] The second mixing component 7 receives the newly and old asphalt mixture that has completed the primary mixing and enters the mixing cylinder for secondary mixing, enabling the new and old materials to be fully blended, ensuring that the final mixture is evenly stirred without the appearance of variegated materials, so that the mixture has good construction engineering properties.

[0043] The specific usage process of this device is as follows:

[0044] 1. Transport the accessories of all equipment to the work site for splicing and assembly, and the overall assembly is the whole mixing plant.

[0045] 2. Connect all the circuits and conduct tests. Only after confirming that there is no error can the next operation be carried out.

[0046] 3. Start all switches to conduct no-load tests on the equipment, observe whether each equipment is working properly, and only after each equipment is working properly can the next step be carried out.

[0047] 4. The RAP coarse material and the RAP fine material are stored in the first batching component 11 and the second batching component 12 respectively. The RAP coarse material is lifted by the first transmission component 21, which can be an elevator, to the hot air drying component 31, which can be a hot air drying cylinder, and the RAP coarse material is heated to 110°C to 130°C to remove the moisture in the RAP material. After being heated by hot air, the RAP coarse material enters the microwave drying component 32, which can be a microwave heating box. At the same time, the RAP fine material is lifted directly by the second transmission component 22, which can be an elevator, to the microwave drying component 32, which can be a microwave heating box, and is evenly spread on the heated RAP coarse material according to the laboratory mix ratio and enters the microwave drying component 32 for heating. The microwave of the microwave heating box 5 acts directly on the aggregate, heating the inside of the RAP aggregate, raising the temperature of the RAP material to 160°C or even higher, and avoiding the aging caused by the rapid heating of the RAP fine material by the high-temperature hot air. The heated and dried RAP old material is temporarily stored in this silo, and the old material is put into the first storage component 4 through the opening and closing of the hydraulic switch. The first metering component 5 can achieve intermittent weighing, ensure the metering accuracy, and accurately weigh the required hot RAP material for mixing in real time according to the set design target value. The RAP aggregate enters the first mixing component 6 after being metered. The first mixing component 6 can be a mixer. There is an additive adding port on the surface of the first mixing component 6, which can realize the function of adding a certain amount of regenerant according to the demand during the mixing process. The first mixing component 6 and the third batching component 13, which can be a new material mixing device, enter the second mixing component 7, that is, the total mixing device, for secondary mixing according to a certain proportion of the new and old mixtures. After the secondary mixing is completed, it enters the second storage component 8, that is, the finished product storage silo. When a certain amount is stored and collected, it is transported to the construction site by a transport vehicle for paving. This process is carried out continuously until the amount of the produced mixture reaches the expected target before the operation ends.

[0048] The first batching component 11 and the second batching component 12 of this device are respectively used to configure RAP materials with different particle size dimensions. The particle size of the RAP material in the first batching component 11 is larger than that of the RAP material in the second batching component 12. Even if the coarse and fine materials of the RAP material are respectively added to the hot air drying cylinder and the microwave heating box, the coarse material undergoes two-stage heating throughout the hot air drying component and the microwave drying process, but the fine material is only heated in the microwave component stage, avoiding the aging and coking of the RAP fine material directly entering the hot air drying component, and avoiding the increase in viscosity of the fine material during high-temperature heating in the traditional drying cylinder. Under the rotation of the drying cylinder, the fine material is easily adhered to the rake teeth and the cylinder wall, effectively solving the problem of the fine material sticking in the hot air drying component of the RAP, improving the working efficiency of the existing microwave hot recycling asphalt mixing plant, and ensuring the existing operation safety. It also reduces the asphalt fumes generated after the aging and coking of the RAP fine material, reducing the environmental pollution of the existing microwave hot recycling asphalt mixing plant.

[0049] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A preparation device for recycled asphalt mixture, characterized in that, It includes a first batching component (11), a second batching component (12), a third batching component (13), a hot air drying component (31), a microwave drying component (32), and a second mixing component (7); The first batching component (11), the hot air drying component (31), the microwave drying component (32), and the second mixing component (7) are connected in sequence; The second batching component (12) is connected to the microwave drying component (32); The third batching component (13) is connected to the second mixing component (7); The particle size of the RAP material in the first batching component (11) is larger than that of the RAP material in the second batching component (12); The preparation device further includes a first storage component (4), a first metering component (5), and a first mixing component (6). The first storage component (4), the first metering component (5), and the first mixing component (6) are connected in sequence and are arranged between the microwave drying component (32) and the second mixing component (7); The preparation device further includes a first transmission component (21) and a second transmission component (22); one end of the first transmission component (21) is connected to the outlet end of the first batching component (11), and the other end is connected to the inlet end of the hot air drying component (31); one end of the second transmission component (22) is connected to the outlet end of the second batching component (12), and the other end is connected to the inlet end of the microwave drying component (32).

2. The preparation device for recycled asphalt mixture according to claim 1, characterized in that, The first transmission component (21) and the second transmission component (22) are lifting transmission components.

3. The preparation device for recycled asphalt mixture according to claim 1, characterized in that, The first storage component (4) is located directly below the microwave drying component (32).

4. The preparation device for recycled asphalt mixture according to claim 1, characterized in that, The first metering component (5) is located directly below the first storage component (4).

5. The preparation device for recycled asphalt mixture according to claim 1, characterized in that, The first mixing component (6) is located directly below the first metering component (5).

6. The preparation device for recycled asphalt mixture according to claim 1, characterized in that, Several openings are also provided at the top of the first mixing component (6).

7. The preparation device for recycled asphalt mixture according to claim 1, characterized in that, A second metering component is provided inside the third batching component (13).

8. The preparation device for recycled asphalt mixture according to claim 1, characterized in that, The preparation device further includes a second storage component (8), and the inlet end of the second storage component (8) is connected to the outlet end of the second mixing component (7).

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