A single drum heating apparatus
By setting up high-temperature and low-temperature zones in the single-drum heating equipment and utilizing a zoned feeding and screening mixing mechanism, the heating efficiency and uniformity issues of single-drum equipment in the preparation of warm-mix recycled asphalt mixtures have been solved, achieving efficient heating and uniform mixing of waste materials and improving construction quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SOUTHWEAT UNIV OF SCI & TECH
- Filing Date
- 2025-07-30
- Publication Date
- 2026-06-26
AI Technical Summary
Single-drum heating equipment has problems with heating efficiency, mixing uniformity and temperature control in the preparation of warm-mix recycled asphalt mixtures, making it difficult to meet the heating requirements of waste materials, especially in the preparation of warm-mix recycled asphalt mixtures where the technical requirements are difficult to fully meet.
The inclined cylinder is equipped with high-temperature and low-temperature zones. Recycled materials and new aggregates are fed into different zones through a zoned feeding mechanism. The temperature and time are adjusted according to the heating requirements. Combined with the screening structure and stirring mechanism, differentiated treatment is achieved to ensure uniform mixing and heating of recycled materials and new aggregates.
It effectively solves the technical problems of single-drum equipment in the preparation of warm-mix recycled asphalt mixtures, realizes efficient heating and uniform mixing of waste materials, reduces fuel waste, prevents carbonization or aging of fine materials, and improves construction quality.
Smart Images
Figure CN224412251U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of processing equipment technology, specifically relating to a single-drum heating device. Background Technology
[0002] Single-drum asphalt mixing plants, as production equipment with simple structure, convenient operation, and low cost, have been widely used in small and medium-sized engineering projects. However, facing the increasingly complex demands for warm-mix recycled asphalt mixture production, the performance limitations of single-drum equipment have gradually become apparent. Especially in composite processes combining warm-mix and recycling technologies, single-drum equipment suffers from several issues, including heating efficiency, mixing uniformity, and temperature control, directly affecting the production quality and construction results of the mixture.
[0003] Traditional hot-mix asphalt mixture preparation requires heating aggregates to 170–180°C, resulting in high energy consumption and significant pollution. Warm-mix asphalt mixture technology, which can prepare and pave mixtures at lower temperatures, offers significant advantages in reducing energy consumption and greenhouse gas emissions, and has received widespread attention in recent years. The combination of warm-mix technology and recycling technology can not only lower construction temperatures but also improve the utilization rate of waste materials, representing an important development direction for current asphalt mixture preparation technology. However, this composite technology places high demands on production equipment, particularly in balancing the technical requirements of aggregate heating, recycled material activation, and the warm-mix process, which has become a major challenge in engineering practice.
[0004] Currently, most warm-mix recycled asphalt mixing equipment used in engineering projects is either double-drum or dedicated multi-functional equipment. These systems utilize independent aggregate heating and mixing systems to meet the step-by-step heating requirements of virgin and recycled aggregates, achieving uniform mixing of the asphalt mixture. However, due to their high cost and complex technology, these types of equipment are difficult to promote and apply in small and medium-sized construction units and projects with limited resources. In contrast, single-drum asphalt mixing equipment, with its simple structure, low cost, and wide adaptability, remains the main equipment widely used in small and medium-sized projects. Because it integrates aggregate heating and mixing functions, single-drum equipment has certain limitations in terms of aggregate heating time, mixture uniformity, and process compatibility. These limitations are particularly pronounced in the preparation of warm-mix recycled asphalt mixtures. For example, the heating requirements for recycled and virgin aggregates differ, and the activation of the old asphalt film and the coating of the new asphalt require precise temperature control, which the relatively low construction temperature of the warm-mix process cannot fully meet. Utility Model Content
[0005] To address the problem of how to enable single-drum heating equipment to meet the requirements of warm mixing and recycling of waste asphalt mixtures in existing technologies, this utility model provides a single-drum heating equipment.
[0006] The technical solution adopted in this utility model is as follows:
[0007] A single-drum heating device includes an inclined cylinder. A low-temperature zone and a high-temperature zone are sequentially arranged inside the cylinder from low to high. A recycled material feeding mechanism and a new aggregate feeding mechanism are provided on the cylinder. The recycled material feeding mechanism is located in the low-temperature zone, and the new aggregate feeding mechanism is located in the high-temperature zone. A first stirring mechanism with a screening structure is provided in the high-temperature zone. A second stirring mechanism is provided in the low-temperature zone.
[0008] By adopting this technical solution, this invention sets up high-temperature and low-temperature zones within the inclined drum. Recycled material and new aggregate are fed into different zones of the drum via a recycled material feeding mechanism and a new aggregate feeding mechanism, respectively. The heating temperature and time are adjusted according to their different heating requirements to achieve differentiated treatment, satisfying the heating needs of both new and recycled materials. Subsequently, the separately heated recycled and new aggregates are mixed within the drum, effectively solving the problem of how to make a single-drum heating device suitable for the warm-mix recycling of waste asphalt mixtures. This invention also includes a first mixing mechanism and a second mixing mechanism. The first mixing mechanism is equipped with a screening structure to separate fine materials (such as sand and stone powder) from coarse materials (such as crushed stone) in the new aggregate. Fine materials pass through the fly plate more quickly, shortening their residence time in the high-temperature zone and preventing overheating; coarse materials are blocked, extending the heating time to ensure thorough drying. This grading process ensures more uniform heating of aggregates of different particle sizes, reducing fuel waste and preventing fine materials from carbonizing at high temperatures or asphalt from aging.
[0009] Preferably, the first stirring mechanism includes several screening-type fly plate groups disposed in the high-temperature zone. The screening-type fly plate groups are arranged sequentially along the length of the cylinder. Each screening-type fly plate group consists of several screening-type fly plates that are evenly distributed around the inner wall of the cylinder. Each screening-type fly plate is inclined in the opposite direction of the rotation of the cylinder. Each screening-type fly plate is provided with several screening holes, and the screening holes constitute the screening structure.
[0010] After adopting this technical solution, the aggregate can be initially screened through the screening holes on several screening-type fly material plate groups during the rotation of the cylinder.
[0011] Preferably, the new aggregate feeding mechanism includes a new aggregate feeding port located in the high-temperature zone. The new aggregate feeding port is located in the middle of the end of the cylinder. A conveyor belt is provided at the new aggregate feeding port. One end of the conveyor belt is located outside the cylinder, and the other end is located close to the first stirring mechanism.
[0012] After adopting this technical solution, new aggregates can be transported to the high-temperature zone via a conveyor belt.
[0013] Preferably, the second mixing mechanism includes several non-screening fly plates arranged near the recycled material feeding mechanism. The several non-screening fly plates are evenly distributed around the inner wall of the cylinder, and each non-screening fly plate is inclined in the opposite direction of the cylinder's rotation.
[0014] With this technical solution, the main function of the non-screening fly plate is to lift the aggregate to the height of the drum and then scatter it freely, forming a "material curtain," which increases the contact area between the aggregate and the hot air and improves the heat exchange efficiency. By continuously turning the aggregate, it ensures that the coarse and fine particles are evenly mixed, avoiding local overheating or insufficient drying.
[0015] Preferably, the recycled material feeding mechanism includes a recycled material feeding port located in the low-temperature zone, the recycled material feeding port being located on the side of the cylinder, and a valve being provided inside the recycled material feeding port.
[0016] Preferably, a flame burner is provided on the lower side of the cylinder, and the outer flame of the flame burner is located in the high-temperature zone.
[0017] After adopting this technical solution, the flame burner emits flame into the cylinder. Due to the high temperature of the outer flame, a high-temperature zone and a low-temperature zone are formed inside the cylinder.
[0018] Preferably, a guide plate is provided inside the cylinder near the nozzle of the flame burner. The guide plate has an annular structure and its diameter is larger than that of the flame.
[0019] By adopting this technical solution, the flow path of the hot airflow can be changed by setting a guide plate inside the cylinder, increasing the contact time between the hot airflow and the aggregate, and improving the heat exchange efficiency.
[0020] Preferably, the system also includes a cylinder support frame, on which a roller support ring is provided. The cylinder is rotatably mounted on the roller support ring, and the cylinder is also connected to a drive mechanism for driving the cylinder to rotate relative to the roller support ring.
[0021] After adopting this technical solution, the cylinder can be driven to rotate on the drum support ring through the drive mechanism, so that the material inside the cylinder is mixed evenly and the mixing is achieved.
[0022] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:
[0023] 1. This utility model sets up a high-temperature zone and a low-temperature zone in the inclined cylinder. The recycled material and the new aggregate are fed into different zones of the drum by a recycled material feeding mechanism and a new aggregate feeding mechanism, and the heating temperature and time are adjusted according to their different heating requirements to achieve differentiated treatment, so as to meet the heating needs of the new aggregate and the recycled material respectively. Then, the separately heated recycled material and the new aggregate are mixed in the drum, which effectively solves the problem of how to make the single drum heating equipment meet the requirements of warm mixing recycling of waste asphalt mixture.
[0024] 2. This invention also includes a mixing mechanism with a screening structure to separate fine materials (such as sand and stone powder) from coarse materials (such as crushed stone) in the new aggregate. Fine materials pass through the fly plate more quickly, shortening their residence time in the high-temperature zone and preventing overheating; coarse materials are blocked, extending the heating time to ensure thorough drying. This grading process ensures more uniform heating of aggregates of different particle sizes, reducing fuel waste and preventing fine materials from carbonizing at high temperatures or asphalt from aging. Attached Figure Description
[0025] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:
[0026] Figure 1 This is a schematic diagram of the structure of this utility model;
[0027] Figure 2 This is a schematic diagram of the structure of a single screening-type flyboard assembly in this utility model;
[0028] Figure 3 This is a schematic diagram of the structure of the guide plate and the screening fly plate in this utility model;
[0029] Wherein: 1-Cylinder support, 2-Conveyor belt, 3-Aggregate feed inlet, 4-Screening fly plate, 5-Cylinder, 6-Non-screening fly plate, 7-Recycled material feed inlet, 8-Guide plate, 9-Flame burner, 10-Drum support ring, 11-Drive mechanism. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0031] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0032] The following is combined with Figure 1-3 This utility model will be described in detail.
[0033] A single-drum heating device includes an inclined cylinder 5. It should be noted that the single-drum heating device in this invention is an optimization based on existing technology (Southern Road Machinery GLB3000). Therefore, aspects such as the material and dimensions of the cylinder 5, the material discharge method, and the rotation method are not subject to improvement and can be completely referenced from existing technology. The main function of the cylinder 5 is to accommodate various materials and to mix them within it. The cylinder 5 has a low-temperature zone and a high-temperature zone arranged sequentially from low to high. In this application, the lowest temperature in the low-temperature zone is approximately 120°C, and the highest temperature in the high-temperature zone is approximately 180°C. The terms "low-temperature zone" and "high-temperature zone" refer to the lowest and highest temperatures within the cylinder 5, respectively. The temperature gradually increases from the low-temperature zone to the high-temperature zone within the zone division. The cylinder 5 is equipped with a recycled material feeding mechanism and a new aggregate feeding mechanism. The recycled material feeding mechanism is located in the low-temperature zone, and its function is to add recycled asphalt to the low-temperature zone of the cylinder 5. The new aggregate feeding mechanism is located in the high-temperature zone, and its function is to transport new aggregate to the high-temperature zone of the cylinder 5 for heating. A first stirring mechanism is installed in the high-temperature zone to ensure that the aggregate is in full contact with the heat flow, improving the heating effect. The first stirring mechanism is equipped with a screening structure to separate fine materials (such as sand and stone powder) from coarse materials (such as crushed stone). Fine materials pass through the high-temperature zone more quickly, shortening their residence time and preventing overheating; coarse materials are blocked, extending the heating time to ensure thorough drying. A second stirring mechanism is installed in the low-temperature zone to ensure that the added recycled material fully absorbs the heat from the low-temperature zone.
[0034] In use, the asphalt recycled material is added into the cylinder 5 from the recycled material feeding mechanism, so that it reaches the low temperature zone and is heated in the low temperature zone. Meanwhile, the new aggregate enters into the cylinder 5 from the new aggregate feeding mechanism and is heated in the high temperature zone of the cylinder 5. Since the high temperature zone is located on the high side of the cylinder 5, the aggregate will move towards the low temperature zone where the recycled material is located under the action of the rotation of the cylinder 5 and its own gravity. Therefore, when the two are heated separately, they can be mixed in the low temperature zone.
[0035] In one embodiment, such as Figure 3 The first mixing mechanism shown includes several screening fly plate groups arranged in the high-temperature zone. These screening fly plate groups are arranged sequentially along the length of the cylinder 5. Each screening fly plate group consists of several screening fly plates 4 evenly distributed around the inner wall of the cylinder 5, and each screening fly plate 4 is inclined in the opposite direction to the rotation of the cylinder 5. Each screening fly plate 4 is provided with several screening holes 12, which together form the screening structure. Through the screening holes 12, the aggregate is initially screened during the rotation of the cylinder 5, separating fine materials (such as sand and stone powder) from coarse materials (such as crushed stone). Fine materials pass through the screening fly plates 4 more quickly, shortening their residence time in the high-temperature zone and preventing overheating; coarse materials are blocked, extending the heating time to ensure thorough drying. This grading process ensures more uniform heating of aggregates of different particle sizes, reduces fuel waste, and prevents fine materials from carbonizing at high temperatures or aging of asphalt. In one embodiment, the inner diameter of the annular structure formed by the various screening flyer groups is the same, and several screening flyer groups are evenly arranged at equal intervals inside the cylinder 5; in another embodiment, the screening flyer groups can have two inner diameters, and the large-diameter screening flyer groups and the small-diameter screening flyer groups are arranged alternately at equal intervals inside the cylinder 5 (e.g., Figure 1 (As shown).
[0036] In one embodiment, the new aggregate feeding mechanism includes a new aggregate feeding port 3 located in the high-temperature zone. A conveyor belt 2 is installed at the new aggregate feeding port 3, with one end of the conveyor belt 2 located outside the cylinder 5 and the other end located near the mixing mechanism. It should be noted that the conveyor belt 2 must be made of a high-temperature resistant material, such as a metal conveyor belt. Material is added to the conveyor belt 2 from the outside of the cylinder 5, and the material is then transported into the cylinder 5 by the conveyor belt 2. It should be noted that the conveyor belt 2 needs to be made of a high-temperature resistant material, such as an alloy conveyor belt, to improve its service life.
[0037] In one embodiment, such as Figure 2The second mixing mechanism shown includes several non-screening fly plates 6 positioned near the recycled material feeding mechanism. These non-screening fly plates 6 are evenly distributed circumferentially around the inner wall of the cylinder 5, and each fly plate 6 is inclined in the opposite direction to the rotation of the cylinder 5. The main function of the non-screening fly plates 6 is to lift the aggregate to a high position on the cylinder 5 and then freely scatter it, forming a "material curtain," increasing the contact area between the aggregate and hot air, and improving heat exchange efficiency. Continuous agitation of the aggregate ensures uniform mixing of coarse and fine particles, avoiding localized overheating or insufficient drying.
[0038] In one embodiment, the recycled material feeding mechanism includes a recycled material feeding port 7 located in the low-temperature zone. The recycled material feeding port 7 is situated on the side of the cylinder 5, and a valve is installed inside the recycled material feeding port 7. In this embodiment, the recycled material feeding port 7 is positioned directly opposite the non-screening fly plate 6. After feeding is completed, the valve can be closed to prevent material leakage during rotation.
[0039] In one embodiment, a flame burner 9 is disposed on the lower side inside the cylinder 5, and the outer flame of the flame burner 9 is located in the high-temperature zone. For example... Figure 1 As shown, the flame emitting end of the flame burner 9 is located approximately in the middle of the cylinder 5, resulting in a low-temperature zone behind the flame outlet and a high-temperature zone at the outer flame directly in front of the flame.
[0040] In one embodiment, a guide plate 8 is provided inside the cylinder 5 near the injection port of the flame burner 9. The guide plate 8 has a ring-shaped structure, and its diameter is larger than that of the flame. Providing the guide plate 8 inside the cylinder 5 alters the flow path of the hot airflow, increases the contact time between the hot airflow and the aggregate, and improves heat exchange efficiency. It should be noted that in this embodiment, the guide plate 8 overlaps with the non-screening fly plate 6; that is, the inner diameter of the guide plate 8 is smaller than the inner diameter of the ring structure formed by several non-screening fly plates 6, and the guide plate 8 is fixedly connected to the area of the cylinder 5 where the non-screening fly plates 6 are not located by a support rod.
[0041] In one embodiment, the system further includes a cylinder support 1, on which a roller support ring 10 is mounted. The cylinder 5 is rotatably mounted on the roller support ring 10. The cylinder 5 is also connected to a drive mechanism 11 (whose specific structure is the same as that of the drive mechanism of the Southern Road Machinery GLB3000) for driving the cylinder 5 to rotate relative to the roller support ring 10. The drive mechanism 11 can drive the cylinder to rotate on the roller support ring 10, thereby ensuring that the material inside the cylinder is mixed evenly and achieving mixing.
[0042] The embodiments described above merely illustrate specific implementation methods of this application, and while the descriptions are detailed and specific, they should not be construed as limiting the scope of protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the technical solution of this application, and these modifications and improvements all fall within the scope of protection of this application.
Claims
1. A single-drum heating device, characterized in that: The device includes an inclined cylindrical body (5), and a low-temperature zone and a high-temperature zone are arranged sequentially from the low side to the high side inside the cylindrical body (5). A recycled material feeding mechanism and a new aggregate feeding mechanism are arranged on the cylindrical body (5). The recycled material feeding mechanism is located in the low-temperature zone, and the new aggregate feeding mechanism is located in the high-temperature zone. A first stirring mechanism is arranged in the high-temperature zone, and a screening structure is arranged on the first stirring mechanism. A second stirring mechanism is arranged in the low-temperature zone.
2. The single-drum heating device according to claim 1, characterized in that: The first stirring mechanism includes several screening-type fly plate groups set in the high-temperature zone. The screening-type fly plate groups are arranged sequentially along the length of the cylinder (5). Each screening-type fly plate group is composed of several screening-type fly plates (4) that are evenly distributed around the inner wall of the cylinder (5). Each screening-type fly plate (4) is inclined in the opposite direction of the rotation of the cylinder (5). Each screening-type fly plate (4) is provided with several screening holes (12). The screening holes (12) constitute the screening structure.
3. The single-drum heating device according to claim 1, characterized in that: The new aggregate feeding mechanism includes a new aggregate feeding port (3) located in the high temperature zone. The new aggregate feeding port (3) is located in the middle of the end of the cylinder (5). A conveyor belt (2) is provided at the new aggregate feeding port (3). One end of the conveyor belt (2) is located outside the cylinder (5), and the other end is located close to the first stirring mechanism.
4. The single-drum heating device according to claim 1, characterized in that: The second mixing mechanism includes several non-screening fly plates (6) arranged near the recycled material feeding mechanism. The several non-screening fly plates (6) are evenly distributed around the inner wall of the cylinder (5), and each non-screening fly plate (6) is inclined in the opposite direction of the rotation of the cylinder (5).
5. A single-drum heating device according to claim 1, characterized in that: The recycled material feeding mechanism includes a recycled material feeding port (7) located in the low temperature zone. The recycled material feeding port (7) is located on the side of the cylinder (5), and a valve is provided inside the recycled material feeding port (7).
6. A single-drum heating device according to any one of claims 1-5, characterized in that: A flame burner (9) is provided on the lower side inside the cylinder (5), and the outer flame of the flame burner (9) is located in the high-temperature zone.
7. A single-drum heating device according to claim 6, characterized in that: Inside the cylinder (5), near the nozzle of the flame burner (9), there is a guide plate (8). The guide plate (8) has a ring structure and the diameter of the guide plate (8) is larger than the diameter of the flame.
8. A single-drum heating device according to any one of claims 1-5, characterized in that: It also includes a cylinder support (1), on which a roller support ring (10) is provided, and the cylinder (5) is rotatably mounted on the roller support ring (10). The cylinder (5) is also connected to a drive mechanism (11) for driving the cylinder (5) to rotate relative to the roller support ring (10).