A large-scale recycling additive ratio asphalt mixing station

Abstract

The utility model discloses a big proportion regenerative addition ratio asphalt mixing station belongs to asphalt mixing station production equipment technical field, including cold material supply device, heating device and hoisting device, and cold material supply device is used for supplying regenerative material and raw material, hoisting device includes first regenerative elevator and second regenerative elevator, and heating device includes first regenerative preheating cylinder device and second regenerative cylinder device. The utility model has the beneficial effect that regenerative material is lifted to first regenerative preheating cylinder device and is preheated by first regenerative elevator, and then the regenerative material after preheating is lifted to second regenerative cylinder device and is further heated to the suitable temperature by second regenerative elevator, thereby overcome the problem of not thorough heating caused by cement base layer and other impurities in regenerative material, reduce the asphalt dosage, improve the oiliness quality of regenerative asphalt material.

Description

Technical Field

[0001] This utility model belongs to the technical field of asphalt mixing plant production equipment, and particularly relates to an asphalt mixing plant with a high proportion of recycled additives. Background Technology

[0002] With continuous economic development, people's demand for infrastructure is constantly increasing, and the scale of investment in highway construction is also continuously expanding. At the same time, the focus of many highway construction projects has shifted from pavement construction to maintenance, which also generates a large amount of waste asphalt mixture, leading to environmental pollution and resource waste. Reclaimed asphalt pavement (RAP) refers to the recycling and reuse of asphalt materials from old pavements, aiming to conserve mineral resources, protect the natural environment, and reduce project costs.

[0003] Currently, the utilization of RAP (Recycled Asphalt Pavement) generally involves excavating, collecting, and then centrally crushing asphalt pavements that have been decommissioned or need to be rebuilt. Based on the quality requirements of different pavement layers, a mix design is conducted to determine the proportion of old asphalt mixture added. Recycling agents, new asphalt materials, and new aggregates are then remixed in a mixing plant in a specific ratio to obtain a new mixture, thereby obtaining high-quality recycled asphalt concrete. This recycled asphalt pavement is then laid and reused in ordinary road engineering projects.

[0004] When milling recycled materials on asphalt roads, it is impossible to consider the aging degree of the road surface at different levels. At the same time, it is impossible to ensure that the milled old material does not contain the cement base layer of the road surface. After the cement base layer of the road surface is crushed into fine particles, it will hinder the heating of the recycled material and increase the amount of asphalt used during the production heating process. Therefore, the existing technology lacks methods to thoroughly heat the recycled material and reduce the amount of asphalt used in both the recycling process and the mixing process. The oil quality of the produced recycled asphalt is not good enough and the temperature of the finished material drops too quickly. Moreover, the mixing capacity of the mixing plant cannot be adapted to the requirements of mixing and processing layered recycled materials and new aggregates. Simply using the existing mixing plant for corresponding production cannot achieve high production efficiency.

[0005] When existing asphalt mixing plants heat recycled materials, the presence of fine particles such as cement base layers in the recycled materials can lead to insufficient heating. These particles, due to their low surface temperature, will absorb more asphalt to achieve a bonding effect, thus increasing the amount of virgin asphalt used. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a high-proportion recycled asphalt mixing plant that can thoroughly heat the recycled material, reduce the adsorption of the recycled material to the virgin asphalt, thereby reducing the amount of virgin asphalt used and lowering production costs.

[0007] To achieve the above objectives, this utility model employs the following technical solution: a high-proportion recycled asphalt mixing plant, comprising a cold aggregate supply device, a heating device, and a lifting device. The cold aggregate supply device supplies recycled aggregate and virgin aggregate. The lifting device includes a primary recycling elevator and a secondary recycling elevator. The heating device includes a primary recycling preheating drum device and a secondary recycling drum device. The bottom of the primary recycling elevator is connected to the cold aggregate supply device, and the top of the primary recycling elevator is connected to the inlet of the primary recycling preheating drum device. The primary recycling elevator lifts the recycled aggregate to the primary recycling preheating drum device for preheating. The outlet of the primary recycling preheating drum device is connected to the bottom of the secondary recycling elevator, and the top of the secondary recycling elevator is connected to the inlet of the secondary recycling drum device. The secondary recycling elevator lifts the preheated recycled aggregate to the secondary recycling drum device for further heating.

[0008] The heating device also includes a raw material drum device, which is connected to a cold material supply device. The cold material supply device delivers the raw material into the raw material drum device for heating.

[0009] The lifting device also includes a raw aggregate elevator, the bottom of which is connected to the discharge port of the raw aggregate drum device, and the top of which is connected to a vibrating screen device.

[0010] It also includes a mixing device and a main building frame. The discharge port of the secondary recycling drum device and the discharge port of the vibrating screen device are both connected to the mixing device.

[0011] The cold material supply device includes a recycled material hopper and a recycled material conveyor belt. The recycled material hopper is used to transport the recycled material to the primary recycled material elevator via the recycled material conveyor belt.

[0012] The cold material supply device includes a raw material hopper and a raw material conveyor belt. The raw material hopper is used to transport the raw material to the raw material roller device for heating via the raw material conveyor belt.

[0013] The angle between the rotation axis of the primary regeneration preheating drum device and the secondary regeneration drum device and the horizontal line is 3-5 degrees.

[0014] It also includes a dust removal device, which is used to collect the flue gas and dust generated during the operation of the mixing plant.

[0015] It also includes a regenerated flue gas system, which is used to recycle the flue gas generated during the operation of the mixing plant.

[0016] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0017] 1. This utility model utilizes a primary recycling elevator to lift the recycled material into a primary recycling preheating drum device for preheating, and then uses a secondary recycling elevator to lift the preheated recycled material into a secondary recycling drum device for further heating to a suitable temperature. This overcomes the problem of incomplete heating caused by impurities such as cement base in the recycled material, reduces the amount of asphalt used, and improves the oiliness quality of the recycled asphalt material.

[0018] 2. This utility model, by adjusting the structure and rotation speed of the primary recycling preheating drum device and the secondary recycling drum device, achieves high-quality asphalt production through step-by-step and graded mixing, and under reasonable preheating conditions, distribution of the recycling flue gas system pipeline, mixing conditions, and heating conditions, with new aggregate added in a reasonable ratio. Under optimal preheating temperature, preheating time, mixing temperature, and mixing time conditions, it can obtain high-quality asphalt, effectively improving the utilization rate of old aggregate, improving the performance of the road surface, and extending its service life.

[0019] 3. The recycled asphalt mixture heating and mixing plant provided by this utility model has high preheating and mixing efficiency through the preheating of recycled materials; the material unloading efficiency can be improved by using a rapid unloading device; the mixing device can efficiently mix and heat the mixture; the recycled asphalt mixture heating and mixing plant of this device can be adapted to the recycled asphalt mixture heating and mixing process, has high production efficiency, and can obtain high product quality. Attached Figure Description

[0020] Figure 1 The diagram shows the layout of an asphalt mixing plant with a high proportion of recycled additives.

[0021] In the diagram: 11. Recycled hopper; 12. Raw hopper; 13. Raw conveyor belt; 14. Recycled conveyor belt; 2. Raw drum unit; 3. Dust removal device; 4. Primary recycling preheating drum unit; 5. Secondary recycling drum unit; 6. Mixing device; 7. Recycled flue gas system; 81. Raw aggregate elevator; 82. Secondary recycling elevator; 83. Primary recycling elevator; 9. Vibrating screen unit; 10. Main building frame. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0023] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example 1

[0025] Reference Figure 1 This embodiment provides a high-proportion recycled asphalt mixing plant, specifically including a cold aggregate supply device, a heating device, and a lifting device. The cold aggregate supply device is used to supply recycled aggregate and virgin aggregate. The lifting device includes a primary recycling elevator 83 and a secondary recycling elevator 82. The heating device includes a primary recycling preheating drum device 4 and a secondary recycling drum device 5. The bottom of the primary recycling elevator 83 is connected to the cold aggregate supply device, and the top of the primary recycling elevator 83 is connected to the inlet of the primary recycling preheating drum device 4. The primary recycling elevator 83 lifts the recycled aggregate to the primary recycling preheating drum device 4 for preheating. The outlet of the primary recycling preheating drum device 4 is connected to the bottom of the secondary recycling elevator 82, and the top of the secondary recycling elevator 82 is connected to the inlet of the secondary recycling drum device 5. The secondary recycling elevator 82 lifts the preheated recycled aggregate to the secondary recycling drum device 5 for further heating.

[0026] The lifting device is used to lift and move recycled and virgin materials. The virgin aggregate elevator 81 is located on one side of the virgin drum device 2. The discharge port of the virgin drum device 2 is connected to the inlet of the virgin aggregate elevator 81. The primary recycling elevator 83 is located on one side of the primary recycling preheating drum device 4. The inlet of the primary recycling elevator 83 is connected to the outlet of the recycling conveyor belt 14. The outlet of the primary recycling elevator 83 is connected to the inlet of the primary recycling preheating drum device 4. The secondary recycling elevator 82 is located at the tail of the primary recycling preheating drum device 4. The inlet of the secondary recycling elevator 82 is connected to the outlet of the primary recycling preheating drum device 4. The outlet of the secondary recycling elevator 82 is connected to the inlet of the secondary recycling drum device 5. Example 2

[0027] This embodiment provides a high-proportion recycled asphalt mixing plant, which differs from Embodiment 1 in that the heating device also includes a virgin drum device 2, which is connected to a cold material supply device. The cold material supply device delivers the virgin material into the virgin drum device 2 for heating.

[0028] The lifting device also includes a raw aggregate elevator 81, the bottom of which is connected to the discharge port of the raw aggregate drum device 2, and the top of the raw aggregate elevator 81 is connected to a vibrating screen device 9.

[0029] It also includes a mixing device 6 and a main building frame 10. The discharge port of the secondary recycling drum device 5 and the discharge port of the vibrating screen device 9 are both connected to the mixing device 6.

[0030] The cold material supply device includes a recycled hopper 11 and a recycled conveyor belt 14. The recycled hopper 11 is used to transport the recycled material to the primary recycling elevator 83 via the recycled conveyor belt 14. The cold material supply device includes a virgin hopper 12 and a virgin conveyor belt 13. The virgin hopper 12 is used to transport the virgin material to the virgin roller device 2 via the virgin conveyor belt 13 for heating.

[0031] The rotation axes of the primary regenerating preheating drum device 4 and the secondary regenerating drum device 5 are at an angle of 3-5 degrees to the horizontal line. It also includes a dust removal device 3, which collects the flue gas and dust generated during the mixing plant's operation. Furthermore, it includes a regenerated flue gas system 7, which recycles the flue gas generated during the mixing plant's operation.

[0032] The primary recycling preheating drum device 4 is driven to rotate by four geared motors at the bottom of the drum. The speed of the four geared motors is adjusted by frequency conversion control, thereby adjusting the speed of the primary recycling preheating drum device 4. At the same time, the horizontal inclination angle of the primary recycling preheating drum device 4 is 3-5 degrees. By adjusting the speed and inclination angle, the time that the recycled material spends inside the primary recycling preheating drum is adjusted, and the recycled material is heated from room temperature to 60℃-80℃ in the primary recycling preheating drum. This temperature can ensure that the recycled material does not stick together, while ensuring that the moisture content of the recycled material is reduced. The dust inside the recycled material is attracted to the dust removal device 3 through the recycling flue gas system 7 as a channel and the dust removal device 3 as a power source and storage bin.

[0033] The secondary recycling drum device 5 is driven by four geared motors at the bottom of the drum. The speed of the four geared motors is adjusted by frequency converter control, thereby adjusting the speed of the secondary recycling drum device 5. At the same time, the horizontal inclination angle of the secondary recycling drum is 3-5 degrees. By adjusting the speed and inclination angle, the time that the recycled material spends inside the secondary recycling drum is adjusted, heating the recycled material from 60℃-80℃ to 140℃-160℃ in the secondary recycling drum. At this temperature, aging of the mixture can be prevented during the heating process, while ensuring better uniformity of the total mixture. Since the recycled material entering the secondary recycling drum device 5 has a low moisture and powder content, there is sufficient heat and time to transfer heat to the interior of the recycled material inside the secondary recycling drum device 5, ensuring a small temperature difference between the inside and outside of the recycled material. This ensures that the asphalt contained in the recycled material is heated and melted, thereby increasing the addition ratio of recycled material and reducing the amount of asphalt used in the finished product.

[0034] The regenerated flue gas system 7 connects the primary drum unit 2, the dust removal device 3, the primary regenerated preheating drum unit 4, and the secondary regenerated drum unit 5. The asphalt fumes generated during the heating of recycled materials by the secondary regenerated drum unit 5 are distributed through pipelines to the interior of the primary drum unit 2 and the primary regenerated preheating drum unit 4 as intermediate combustion. Finally, the flue gas after combustion, the dust inside the primary drum unit 2, the dust inside the primary regenerated preheating drum unit 4, and the dust inside the secondary regenerated drum unit 5 enter the dust removal device 3 through pipelines for reuse.

[0035] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A large scale, RAP-additive bituminous plant, characterized in that, It includes a cold material supply device, a heating device, and a lifting device, wherein the cold material supply device is used to supply recycled material and virgin material; The lifting device includes a primary recycling elevator (83) and a secondary recycling elevator (82), and the heating device includes a primary recycling preheating drum device (4) and a secondary recycling drum device (5). The bottom of the primary recycling elevator (83) is connected to the cold material supply device, and the top of the primary recycling elevator (83) is connected to the feed inlet of the primary recycling preheating drum device (4). The primary recycling elevator (83) lifts the recycled material to the primary recycling preheating drum device (4) to preheat the recycled material. The discharge port of the primary recycling preheating drum device (4) is connected to the bottom of the secondary recycling elevator (82), and the top of the secondary recycling elevator (82) is connected to the feed port of the secondary recycling drum device (5). The secondary recycling elevator (82) lifts the preheated recycled material to the secondary recycling drum device (5) for further heating of the recycled material.

2. The large-scale RAP addition ratio bituminous mixing plant according to claim 1, characterized by, The heating device also includes a raw material roller device (2), which is connected to a cold material supply device. The cold material supply device delivers the raw material into the raw material roller device (2) for heating.

3. The large-scale RAP addition ratio bituminous mixing plant according to claim 1, characterized in that, The lifting device also includes a raw aggregate elevator (81), the bottom of which is connected to the discharge port of the raw drum device (2), and the top of which is connected to a vibrating screen device (9).

4. The large-scale RAP additive bituminous mixing plant according to claim 3, characterized in that, It also includes a mixing device (6) and a main building frame (10). The discharge port of the secondary regeneration drum device (5) and the discharge port of the vibrating screen device (9) are both connected to the mixing device (6).

5. The large-scale RAP addition ratio bituminous mixing plant according to claim 1, characterized in that, The cold material supply device includes a recycled hopper (11) and a recycled conveyor belt (14), wherein the recycled hopper (11) is used to transport the recycled material to the primary recycled elevator (83) via the recycled conveyor belt (14).

6. The large-scale RAP addition ratio bituminous mixing plant according to claim 1, characterized in that, The cold material supply device includes a raw material hopper (12) and a raw material conveyor belt (13). The raw material hopper (12) is used to transport the raw material through the raw material conveyor belt (13) to the raw material roller device (2) for heating.

7. The large-scale RAP addition ratio bituminous mixing plant according to claim 1, characterized in that, The angle between the rotation axis of the primary regeneration preheating drum device (4) and the secondary regeneration drum device (5) and the horizontal line is 3-5 degrees.

8. A large-scale regenerative additive bituminous mixing plant according to any one of claims 1 to 7, characterized in that, It also includes a dust removal device (3), which is used to collect the flue gas and dust generated during the operation of the mixing plant.

9. The large-scale RAP addition ratio bituminous mixing plant according to claim 8, characterized in that, It also includes a regenerated flue gas system (7), which is used to recycle the flue gas generated during the operation of the mixing plant.

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