Heating device of old asphalt mixture recovery system and recovery system
By adopting an upper and lower layered silo design and a layered air intake structure in the old asphalt mixture recycling system, combined with a testing mechanism to achieve precise temperature control, the problems of low heating efficiency and poor uniformity of drum heaters have been solved, improving the production efficiency and quality of recycled materials and realizing the efficient recycling of old asphalt mixtures.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FUJIAN 188 CONSTRUCTION ENGINEERING CO LTD
- Filing Date
- 2025-05-29
- Publication Date
- 2026-05-05
AI Technical Summary
In existing technologies, drum-type heating furnaces have low heating efficiency and poor temperature uniformity for old asphalt mixtures, resulting in fluctuations in the quality of recycled materials and affecting production efficiency.
The material silo structure adopts a two-tiered design, combined with layered air intake and central ventilation pipe, to increase the contact area between the old asphalt mixture and the heat source, and achieves precise temperature control through a testing agency to avoid local overheating or insufficient heating.
It significantly improves the heating rate and production efficiency, ensures stable quality of recycled materials, reduces energy consumption and environmental pollution, and achieves efficient recycling of old asphalt mixtures.
Smart Images
Figure CN224199744U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of used asphalt recycling equipment, specifically to a heating device for a used asphalt mixture recycling system. Background Technology
[0002] As a major highway country, my country generates over 200 million tons of old asphalt mixture annually from newly added highway mileage and maintenance projects. In the reconstruction and expansion of expressways, the conversion of a single 100-kilometer-long two-way four-lane highway can generate 200,000 to 300,000 tons of old asphalt mixture.
[0003] Used asphalt mixtures contain 3% to 6% asphalt, which is a byproduct of petroleum refining and a non-renewable resource. Each ton of used material discarded is equivalent to wasting 30 to 60 kilograms of petroleum asphalt. Aggregates (crushed stone and sand) account for over 90% of used materials, and most of these are processed, high-quality aggregates. Each ton of used material discarded is equivalent to wasting over 900 kilograms of natural stone, exacerbating the shortage of sand and gravel resources.
[0004] In urban road renovation projects, asphalt mixtures are often dumped nearby due to high transportation costs. A large amount of asphalt mixtures are directly landfilled or used inefficiently, resulting in resource waste, consumption of non-renewable resources, and environmental pollution. Long-term accumulation of asphalt in old materials may release toxic substances such as polycyclic aromatic hydrocarbons, polluting soil and groundwater; while dust from open-air stockpiles exacerbates air pollution.
[0005] Currently, in the recycling process of used asphalt mixtures, drum-type heating furnaces are used to heat the mixtures. These furnaces use rotating drums to tumble the material, indirectly heating the mixture through heat radiation from the furnace walls. This heating method has a limited contact area between the mixture and the heat source, and a long heating path (requiring conduction through the drum walls), resulting in slow heating rates. This is especially true when heating high-humidity or large-particle-size waste materials, where the heating time is even longer, impacting overall production efficiency. The mixture falls in a "curtain" pattern within the drum, making materials near the furnace walls prone to overheating, while the central area may be underheated. This can lead to localized aging of the used asphalt due to high temperatures (producing asphaltenes and coke), reducing the performance of the recycled material. Insufficiently heated used asphalt mixtures also affect the uniformity of subsequent mixing, causing fluctuations in the quality of the recycled material. Utility Model Content
[0006] Therefore, a heating device for a used asphalt mixture recycling system is needed to solve the technical problems of low heating efficiency, poor temperature uniformity, and fluctuations in the quality of recycled materials caused by using a drum heater to heat the used asphalt mixture in the current recycling process.
[0007] To achieve the above objectives, the inventors provide a heating device for a used asphalt mixture recycling system, comprising:
[0008] First material warehouse;
[0009] The second hopper is located above the first hopper, and the first hopper is connected to the second hopper;
[0010] A first heating mechanism is used to provide a heat source to the old asphalt mixture;
[0011] The first air supply mechanism is connected at one end to the first heating mechanism and at the other end to the first silo and the second silo via air ducts. The first air supply mechanism is used to deliver the heat source generated by the first heating mechanism to the first silo and the second silo.
[0012] As a preferred structure of this utility model, both the first silo and the second silo are provided with at least two first air inlets and air outlets. The at least two first air inlets are spaced apart along the height direction of the first silo, and the at least two first air inlets are spaced apart along the height direction of the second silo. The at least two first air inlets are respectively connected to the first air supply mechanism through air ducts.
[0013] As a preferred structure of this utility model, a second air inlet is provided on the top or bottom of the second hopper, and one end of the second air inlet is connected to the first air supply mechanism through an air duct.
[0014] The heating device also includes a ventilation pipe, which is located inside the second silo. The other end of the second air inlet is connected to one end of the ventilation pipe via a duct. The ventilation pipe has multiple through holes.
[0015] In a preferred embodiment of this invention, the ventilation pipe is located in the central area of the second silo, and the other end of the ventilation pipe is fixedly located at the bottom of the second silo.
[0016] As a preferred structure of this utility model, a plurality of through holes are evenly distributed on the outer wall of the ventilation pipe, and the shape of the through holes is rectangular, circular or triangular.
[0017] As a preferred structure of this utility model, the heating device further includes a control mechanism, a first detection mechanism, and a second detection mechanism;
[0018] The first detection mechanism is located inside the first silo and is electrically connected to the control mechanism. The first detection mechanism is used to detect the temperature of the old asphalt mixture inside the first silo.
[0019] The second detection mechanism is located inside the second silo and is electrically connected to the control mechanism. The second detection mechanism is used to detect the temperature of the old asphalt mixture inside the second silo.
[0020] The first heating mechanism is electrically connected to the control mechanism. The control mechanism is used to receive and identify the detection signals from the first detection mechanism and the second detection mechanism in order to control the start and stop of the first heating mechanism.
[0021] As a preferred structure of this utility model, the heating device further includes a first heat preservation mechanism and a second heat preservation mechanism;
[0022] The first insulation mechanism is installed on the outer wall of the first silo, and the first insulation mechanism is used to reduce heat loss in the first silo.
[0023] The second insulation mechanism is installed on the outer wall of the second silo, and the second insulation mechanism is used to reduce heat loss inside the second silo.
[0024] As a preferred structure of this utility model, the heating device further includes an inlet pipe and an outlet pipe;
[0025] The feed pipe is located at the top of the first hopper and is connected to the first hopper;
[0026] The bottom of the first hopper is connected to the top of the second hopper;
[0027] The discharge pipe is located at the bottom of the second hopper and is connected to the second hopper.
[0028] The advantages of the above technical solution, which differs from the existing technology, are as follows: In the heating device of the old asphalt mixture recycling system of this utility model, the old asphalt mixture enters the first silo. Since the first and second silos are connected vertically, the mixture gradually falls under the action of gravity. During this process, the first air supply mechanism sends the hot air generated by the first heating mechanism into the first and second silos. The hot air in the first and second silos comes into full contact with the old asphalt mixture, heating it. Furthermore, since the first and second silos are designed with upper and lower layers, the contact area between the old asphalt mixture and the heat source is increased by introducing hot air in layers, reducing the quality fluctuation of the recycled material. Compared with the traditional drum heating furnace, the heating rate is greatly improved, especially when processing high-humidity or large-particle-size waste materials, resulting in a significant increase in production efficiency.
[0029] To achieve the above objectives, the inventors provide a used asphalt mixture recycling system, comprising:
[0030] Heating device for the old asphalt mixture recycling system as described in any of the above-mentioned inventors;
[0031] The elevator is connected to the heating device of the old asphalt mixture recycling system via a pipeline, and the elevator is used to transport the old asphalt mixture upwards.
[0032] The second heating mechanism is used to provide a heat source to the old asphalt mixture;
[0033] And a second air supply mechanism, one end of which is connected to the second heating mechanism, and the other end of which is connected to the hoist via an air duct. The second air supply mechanism is used to deliver the heat source generated by the second heating mechanism to the hoist.
[0034] As a preferred structure of this utility model, the old asphalt mixture recycling system further includes a raw material silo, a conveying mechanism, and a fixing frame. The raw material silo is located on one side of the conveying mechanism, and the conveying mechanism is used to convey the old asphalt mixture to the elevator.
[0035] The fixing frame is fixedly installed, and the heating device is fixedly installed on the fixing frame.
[0036] The advantages of the above technical solution, which differs from the existing technology, are as follows: In the old asphalt mixture recycling system of this utility model, the old asphalt mixture enters the first silo. Since the first and second silos are connected vertically, the mixture gradually falls under the action of gravity. During this process, the first air supply mechanism sends the hot air generated by the first heating mechanism into the first and second silos. The hot air comes into full contact with the old asphalt mixture in the first and second silos, heating the old asphalt mixture. Moreover, since the first and second silos are designed to be layered, the contact area between the old asphalt mixture and the heat source is increased by introducing hot air in layers, reducing the quality fluctuation of the recycled material. Compared with the traditional drum heating furnace, the heating rate is greatly improved, especially when processing high-humidity or large-particle-size waste materials, the production efficiency is significantly improved.
[0037] The above description of the utility model is merely an overview of the technical solution of this application. In order to enable those skilled in the art to better understand the technical solution of this application and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this application easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this application. Attached Figure Description
[0038] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of specific embodiments of this application and other related content, and should not be considered as limitations on this application.
[0039] In the accompanying drawings of the instruction manual:
[0040] Figure 1 This is a cross-sectional view of the first silo in a specific implementation embodiment;
[0041] Figure 2 This is a cross-sectional view of the second silo in a specific embodiment;
[0042] Figure 3 This is a partial schematic diagram of the heating device of the old asphalt mixture recycling system described in the specific implementation method;
[0043] Figure 4 This is a schematic diagram of the old asphalt mixture recycling system described in a specific implementation method;
[0044] Figure 5 for Figure 4 One of the enlarged partial schematic diagrams in the image;
[0045] Figure 6 for Figure 4 The second enlarged partial schematic diagram;
[0046] Figure 7 The circuit connection diagram of the heating device of the old asphalt mixture recycling system described in the specific implementation method is shown.
[0047] The reference numerals used in the above figures are explained as follows:
[0048] 100. Raw material warehouse
[0049] 200. Conveying mechanism
[0050] 300. Hoist
[0051] 400. Heating device
[0052] 500. Second heating mechanism.
[0053] 600. Second air supply mechanism,
[0054] 700. Fixture
[0055] 1. First silo
[0056] 11. First air inlet
[0057] 12. Air outlet duct,
[0058] 13. Feed pipe,
[0059] 2. Second hopper,
[0060] 21. Second air inlet
[0061] 22. Ventilation duct,
[0062] 23. Through hole,
[0063] 24. Discharge pipe,
[0064] 3. First heating mechanism,
[0065] 4. First air supply mechanism,
[0066] 5. Control mechanism,
[0067] 6. The first testing agency,
[0068] 7. Second testing agency,
[0069] 8. First insulation mechanism,
[0070] 9. Second insulation mechanism. Detailed Implementation
[0071] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.
[0072] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.
[0073] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.
[0074] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.
[0075] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.
[0076] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.
[0077] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.
[0078] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. These expressions are only for the convenience of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. Furthermore, in this context, it should be understood that when it is mentioned that an element is connected "up" or "down" to another element, it can be directly connected not only to the other element "up" or "down," but also indirectly connected to the other element "up" or "down" through an intermediate element.
[0079] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.
[0080] Please see Figures 1 to 7 This embodiment relates to a heating device 400 for a used asphalt mixture recycling system, including a first silo 1, a second silo 2, a first heating mechanism 3, and a first air supply mechanism 4. The first silo 1 is positioned above the second silo 2 and is connected to it. Both the first silo 1 and the second silo 2 are stainless steel silos. Specifically, in this embodiment, the first silo 1 and the second silo 2 can be metering hoppers. Each metering hopper includes a hopper body, a weighing sensor, and a discharge port. The hopper body is a container for storing materials, and the weighing sensor is installed below the hopper body to detect changes in material weight in real time. The discharge port is located below the hopper body and is equipped with a valve (such as a pneumatic butterfly valve or gate valve) or a discharge gate to precisely control the material discharge volume. It should be noted that the metering hopper is a conventional technical solution in this field and will not be described in detail here.
[0081] Furthermore, the first heating mechanism 3 is used to provide a heat source to the old asphalt mixture to soften it, thereby restoring its fluidity and facilitating subsequent mixing with new material. In this embodiment, the heating mechanism is a burner. It should be noted that the number of burners is not limited in this embodiment; there can be one, two, or four burners, etc., and the appropriate number of burners can be selected according to actual needs.
[0082] Furthermore, one end of the first air supply mechanism 4 is connected to the first heating mechanism 3, and the other end of the first air supply mechanism 4 is connected to the first silo 1 and the second silo 2 via air ducts. The first air supply mechanism 4 is used to deliver the heat source generated by the first heating mechanism 3 to the first silo 1 and the second silo 2 to soften the old asphalt mixture in the first silo 1 and the second silo 2, thereby restoring the fluidity of the old asphalt mixture and facilitating subsequent mixing with new material. The first air supply mechanism 4 is a blower. It should be noted that in this embodiment, the number of blowers is not limited; there can be one, two, or four blowers, etc., and the appropriate number of blowers can be selected according to actual needs. The air duct is a stainless steel corrugated flexible hose.
[0083] Specifically, in the heating device 400 of the old asphalt mixture recycling system in this embodiment, the old asphalt mixture enters the first silo 1. Since the first silo 1 and the second silo 2 are connected vertically, the mixture gradually falls under the action of gravity. During this process, the first air supply mechanism 4 sends the hot air generated by the first heating mechanism 3 into the first silo 1 and the second silo 2. The hot air in the first silo 1 and the second silo 2 comes into full contact with the old asphalt mixture, heating it. Since the first silo 1 and the second silo 2 are designed with upper and lower layers, the contact area between the old asphalt mixture and the heat source is increased by introducing hot air in layers, reducing the quality fluctuation of the recycled material. Compared with the traditional drum heating furnace, the heating rate is greatly improved, especially when processing high-humidity or large-particle-size waste materials, the production efficiency is significantly improved.
[0084] Optionally, in some embodiments, such as Figures 1 to 6 As shown, both the first silo 1 and the second silo 2 are equipped with at least two first air inlets 11 and air outlet pipes 12. The at least two first air inlets 11 are spaced apart along the height direction of the first silo 1, and at least two first air inlets 11 are spaced apart along the height direction of the second silo 2. Each of the at least two first air inlets 11 is connected to the first air supply mechanism 4 via a duct. The at least two first air inlets 11 are designed in a layered manner along the height direction of the first silo 1 and the second silo 2. This layered air inlet structure allows hot air to be evenly distributed within the first silo 1 and the second silo 2, ensuring that the old asphalt mixture can fully contact the heat source at all locations during its descent, achieving uniform heating. It should be noted that the number of first air inlets 11 is not limited in this embodiment; there can be two, four, or five first air inlets 11, etc. In this embodiment, the duct is a stainless steel corrugated flexible hose.
[0085] Optionally, in some embodiments, such as Figures 1 to 6 As shown, a second air inlet 21 is provided on the top of the second silo 2, and one end of the second air inlet 21 is connected to the first air supply mechanism 4 through an air duct; or in other embodiments, a second air inlet 21 is provided on the bottom of the second silo 2. The heating device 400 also includes a ventilation pipe 22, which is disposed inside the second silo 2. The other end of the second air inlet 21 is connected to one end of the ventilation pipe 22 through an air duct, and the ventilation pipe 22 is provided with multiple through holes 23. By providing the second air inlet 21 and the ventilation pipe 22 inside the second silo 2, hot air is sprayed into the second silo 2 through the ventilation pipe 22 and the through holes 23, so that the temperature distribution inside the silo is uniform, ensuring that the old asphalt mixture is heated in all directions, avoiding local overheating or underheating of the material, effectively reducing the phenomenon of asphalt aging due to high temperature, ensuring the stability of the performance of recycled materials, and improving the quality of recycled materials.
[0086] Preferably, in this embodiment, such as Figures 1 to 6 As shown, the ventilation pipe 22 is located in the central area of the second silo 2, and the other end of the ventilation pipe 22 is fixedly located at the bottom of the second silo 2 by a fixing rod or a fixing chain. Hot air is injected through the ventilation pipe 22 and through the through-hole 23 into the central area of the second silo 2, ensuring uniform temperature distribution within the silo and guaranteeing that the old asphalt mixture is heated from all sides. This avoids localized overheating or underheating of the material, effectively reducing the phenomenon of asphalt aging due to high temperatures or poor flowability, ensuring the stable performance of the recycled material, and improving the quality of the recycled material.
[0087] Preferably, in this embodiment, such as Figures 1 to 6 As shown, a plurality of through holes 23 are evenly distributed on the outer wall of the ventilation pipe 22. The through holes 23 are rectangular in shape to uniformly heat the old asphalt mixture. Alternatively, in other embodiments, the through holes 23 may be circular or triangular in shape.
[0088] Optionally, in some embodiments, such as Figures 1 to 7 As shown, the heating device 400 further includes a control mechanism 5, a first detection mechanism 6, and a second detection mechanism 7. The first detection mechanism 6 is located at the bottom of the first silo 1 and is electrically connected to the control mechanism 5. The first detection mechanism 6 is used to detect the temperature of the old asphalt mixture in the first silo 1. The second detection mechanism 7 is located at the bottom of the second silo 2 and is electrically connected to the control mechanism 5. The second detection mechanism 7 is used to detect the temperature of the old asphalt mixture in the second silo 2. The first heating mechanism 3 is electrically connected to the control mechanism 5. The control mechanism 5 is used to receive and identify the detection signals from the first detection mechanism 6 and the second detection mechanism 7 to control the start and stop of the first heating mechanism 3. The first detection mechanism 6 and the second detection mechanism 7 are both infrared thermometers, thermocouple temperature sensors, or resistance temperature sensors, etc. The control mechanism 5 includes a controller, a display screen, and operation keys, which are electrically connected to the controller. The control mechanism 5 is a PLC control mechanism 5. In this embodiment, the heating temperature of the hot air in the first silo 1 is controlled at 70-90℃, and the heating temperature of the hot air in the second silo 2 is controlled at 90-130℃.
[0089] In this embodiment, during operation, the temperature of the old asphalt mixture in the first silo 1 is monitored in real time by the first detection mechanism 6. When the temperature of the old asphalt mixture detected by the first detection mechanism 6 exceeds 90°C, the first detection mechanism 6 sends a detection signal to the control mechanism 5. After recognizing the detection signal, the control mechanism 5 controls the first heating mechanism 3 to stop heating the material in the first silo 1, thus preventing overheating and effectively reducing asphalt aging due to high temperature. Similarly, the temperature of the old asphalt mixture in the second silo 2 is monitored in real time by the second detection mechanism 7. When the temperature of the old asphalt mixture detected by the second detection mechanism 7 exceeds 130°C, the second detection mechanism 7 sends a detection signal to the control mechanism 5. After recognizing the detection signal, the control mechanism 5 controls the first heating mechanism 3 to stop heating the material in the second silo 2, thus preventing overheating and effectively reducing asphalt aging due to high temperature.
[0090] Optionally, in some embodiments, such as Figures 1 to 6 As shown, the heating device 400 further includes a first insulation mechanism 8 and a second insulation mechanism 9. The first insulation mechanism 8 is disposed on the outer wall of the first silo 1 and is used to reduce heat loss within the first silo 1. The second insulation mechanism 9 is disposed on the outer wall of the second silo 2 and is used to reduce heat loss within the second silo 2. The first insulation mechanism 8 and the second insulation mechanism 9 respectively wrap around the outer walls of the first silo 1 and the second silo 2, effectively reducing heat loss from the first silo 1 and the second silo 2 to the outside, maintaining stable temperatures within the first silo 1 and the second silo 2, and reducing energy consumption. Both the first insulation mechanism 8 and the second insulation mechanism 9 are insulation layers, which are multi-layered composite structures. The inner layer is made of a high-temperature resistant material (such as aluminum silicate fiber), the middle insulation layer is made of a material such as glass wool, and the outer protective layer is made of an aluminum plate or color steel plate, thus achieving both insulation and protection.
[0091] Optionally, in some embodiments, such as Figures 1 to 6 As shown, the heating device 400 further includes an inlet pipe 13 and an outlet pipe 24. The inlet pipe 13 is inclinedly disposed at the top of the first silo 1 and is connected to the first silo 1. The inlet pipe 13 is used to transport the old asphalt mixture to the first silo 1. The bottom of the first silo 1 is connected to the top of the second silo 2. The old asphalt mixture falls from the first silo 1 into the second silo 2 under the action of gravity. The outlet pipe 24 is inclinedly disposed at the bottom of the second silo 2 and is connected to the second silo 2. It is used to transport the heated old asphalt mixture to subsequent processing steps.
[0092] Specifically, in this embodiment, the heating device 400 of the old asphalt mixture recycling system, such as... Figures 1 to 6 As shown, the old asphalt mixture enters the first silo 1 through the feed pipe 13. Since the first silo 1 and the second silo 2 are connected vertically, the mixture gradually falls under the influence of gravity. During this process, the first air supply mechanism 4 delivers hot air generated by the first heating mechanism 3 into the first silo 1 and the second silo 2 through multiple first air inlets 11 spaced apart along the height direction. The hot air in the first silo 1 and the second silo 2 comes into full contact with the old asphalt mixture, heating it. At the same time, the second air inlet 21 at the top of the second silo 2 sends hot air into the ventilation pipe 22. The hot air is ejected from the through holes 23 of the ventilation pipe 22, supplementing the heating of the material in the central area of the second silo 2, ensuring that the mixture in the entire silo is heated evenly.
[0093] Please see Figures 1 to 7 This embodiment relates to a used asphalt mixture recycling system, including a raw material silo 100, a conveying mechanism 200, an elevator 300, a fixing frame 700, and a heating device 400 as described in any of the above embodiments. The raw material silo 100 is disposed on one side of the conveying mechanism 200, which conveys the used asphalt mixture to the elevator 300. The elevator 300 is connected to the heating device 400 of the used asphalt mixture recycling system through a feed pipe 13, and the elevator 300 is used to convey the used asphalt mixture upwards. The fixing frame 700 is fixedly disposed on the ground, and the heating device 400 is fixedly disposed on the fixing frame 700, which serves to fix the heating device 400. The raw material silo 100 is used to store and hold the used asphalt mixture. The used asphalt mixture falls from the raw material silo 100 to the conveying mechanism 200, which then transports it to the elevator 300. The elevator 300 then transports the used asphalt mixture upward to a certain height, and finally, the used asphalt mixture enters the heating device 400 through the feed pipe 13 to heat it. In this embodiment, the conveying mechanism 200 is a belt conveyor.
[0094] Furthermore, such as Figures 1 to 6 As shown, the second heating mechanism 500 is used to provide a heat source to the old asphalt mixture to soften it, thereby restoring its fluidity and facilitating subsequent mixing with new material. In this embodiment, the heating mechanism is a burner. It should be noted that the number of burners is not limited in this embodiment; there can be one, two, or four burners, etc., and the appropriate number can be selected according to actual needs. The structure of the second heating mechanism 500 is the same as that of the first heating mechanism 3.
[0095] Furthermore, such as Figures 1 to 6As shown, one end of the second air supply mechanism 600 is connected to the second heating mechanism 500, and the other end is connected to the elevator 300 via a duct. The second air supply mechanism 600 is used to deliver the heat source generated by the second heating mechanism 500 to the hopper of the elevator 300. This softens the old asphalt mixture in the first hopper 1 and the second hopper 2, thereby restoring the fluidity of the old asphalt mixture and preheating it during the conveying process, thus improving the overall heating efficiency. In this embodiment, the heating temperature of the hot air in the hopper of the elevator 300 is controlled at 50-70℃. The second air supply mechanism 600 is a blower. It should be noted that in this embodiment, the number of blowers is not limited; there can be one, two, or four blowers, etc., and the appropriate number of blowers can be selected according to actual needs. The structure of the second air supply mechanism 600 is the same as that of the first air supply mechanism 4.
[0096] Specifically, in this embodiment, the old asphalt mixture recycling system, such as... Figures 1 to 6 As shown, in the preheating stage: the old asphalt mixture is stored in the raw material silo 100, and the conveying mechanism 200 transports the old asphalt mixture in the raw material silo 100 to the elevator 300. In the hopper of the elevator 300, the second air supply mechanism 600 delivers the heat source generated by the second heating mechanism 500 to the elevator 300 to preheat the old asphalt mixture being lifted, ensuring that the mixture reaches a certain temperature (50-70℃) before entering the heating device 400, improving subsequent heating efficiency and reducing overall heating time. Next, in the deep heating stage: the preheated old asphalt mixture enters the first silo 1 of the heating device 400 through the feed pipe 13, where it undergoes deep heating. After heating is completed, it is discharged from the discharge pipe 24 at the bottom of the second silo 2, entering subsequent mixing, recycling, and other processing steps, ultimately achieving the recycling and reuse of the old asphalt mixture.
[0097] The heating device 400 and the beneficial effects of the old asphalt mixture recycling system in the above embodiments, which differ from existing technologies, are as follows:
[0098] High-efficiency heating: The design of the first silo 1 and the second silo 2 through the layered air intake and the central ventilation pipe 22 increases the contact area between the old asphalt mixture and the heat source. Compared with the traditional drum heating furnace, the heating rate is greatly improved, especially when processing high humidity or large particle size waste materials, the production efficiency is significantly improved.
[0099] Uniform heating: Multiple first air inlets 11 are set in layers and hot air is sprayed from the central ventilation pipe 22, so that the temperature distribution in the silo is uniform, avoiding local overheating or underheating of the old asphalt mixture, effectively reducing the phenomenon of asphalt aging or poor fluidity due to high temperature, ensuring the stable performance of recycled material and improving the quality of recycled material.
[0100] Intelligent and precise control: The control mechanism 5, combined with the temperature detection signals from the first detection mechanism 6 and the second detection mechanism 7, can adjust the working state of the first heating mechanism 3 in real time to achieve precise temperature control, further ensure the heating effect, and reduce energy consumption.
[0101] Energy-saving and environmentally friendly: The insulation mechanism reduces heat loss and improves energy efficiency. Furthermore, this recycling system enables the efficient recycling of old asphalt mixtures, reducing the consumption of natural stone and petroleum asphalt, minimizing resource waste, and avoiding environmental pollution problems caused by direct landfilling or inefficient use of old materials, thus aligning with the concept of sustainable development.
[0102] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.
Claims
1. A heating device for a used asphalt mixture recycling system, characterized in that, include: First material warehouse; The second hopper is located above the first hopper, and the first hopper is connected to the second hopper; A first heating mechanism is used to provide a heat source to the old asphalt mixture; The first air supply mechanism is connected at one end to the first heating mechanism and at the other end to the first silo and the second silo via air ducts. The first air supply mechanism is used to deliver the heat source generated by the first heating mechanism to the first silo and the second silo.
2. The heating device for the old asphalt mixture recycling system according to claim 1, characterized in that: Both the first silo and the second silo are provided with at least two first air inlets and air outlets. The at least two first air inlets are spaced apart along the height direction of the first silo, and the at least two first air inlets are spaced apart along the height direction of the second silo. The at least two first air inlets are respectively connected to the first air supply mechanism through air ducts.
3. The heating device for the old asphalt mixture recycling system according to claim 1 or 2, characterized in that: The second hopper is provided with a second air inlet on its top or bottom, and one end of the second air inlet is connected to the first air supply mechanism through an air duct. The heating device also includes a ventilation pipe, which is located inside the second silo. The other end of the second air inlet is connected to one end of the ventilation pipe via a duct. The ventilation pipe has multiple through holes.
4. The heating device for the old asphalt mixture recycling system according to claim 3, characterized in that: The ventilation pipe is located in the central area of the second silo, and the other end of the ventilation pipe is fixedly located at the bottom of the second silo.
5. The heating device for the old asphalt mixture recycling system according to claim 3, characterized in that: Multiple through holes are evenly distributed on the outer wall of the ventilation pipe, and the through holes are rectangular, circular or triangular in shape.
6. The heating device for the old asphalt mixture recycling system according to claim 1 or 2, characterized in that: The heating device also includes a control mechanism, a first detection mechanism, and a second detection mechanism; The first detection mechanism is located inside the first silo and is electrically connected to the control mechanism. The first detection mechanism is used to detect the temperature of the old asphalt mixture inside the first silo. The second detection mechanism is located inside the second silo and is electrically connected to the control mechanism. The second detection mechanism is used to detect the temperature of the old asphalt mixture inside the second silo. The first heating mechanism is electrically connected to the control mechanism. The control mechanism is used to receive and identify the detection signals from the first detection mechanism and the second detection mechanism in order to control the start and stop of the first heating mechanism.
7. The heating device for the old asphalt mixture recycling system according to claim 1 or 2, characterized in that: The heating device also includes a first heat preservation mechanism and a second heat preservation mechanism; The first insulation mechanism is installed on the outer wall of the first silo, and the first insulation mechanism is used to reduce heat loss in the first silo. The second insulation mechanism is installed on the outer wall of the second silo, and the second insulation mechanism is used to reduce heat loss inside the second silo.
8. The heating device for the old asphalt mixture recycling system according to claim 1 or 2, characterized in that: The heating device also includes a feed pipe and a discharge pipe; The feed pipe is located at the top of the first hopper and is connected to the first hopper; The bottom of the first hopper is connected to the top of the second hopper; The discharge pipe is located at the bottom of the second hopper and is connected to the second hopper.
9. A used asphalt mixture recycling system, characterized in that, include: Heating device for the old asphalt mixture recycling system as described in any one of claims 1 to 8 above; The elevator is connected to the heating device of the old asphalt mixture recycling system via a pipeline, and the elevator is used to transport the old asphalt mixture upwards. The second heating mechanism is used to provide a heat source to the old asphalt mixture; And a second air supply mechanism, one end of which is connected to the second heating mechanism, and the other end of which is connected to the hoist via an air duct. The second air supply mechanism is used to deliver the heat source generated by the second heating mechanism to the hoist.
10. The used asphalt mixture recycling system according to claim 9, characterized in that, The old asphalt mixture recycling system also includes a raw material silo, a conveying mechanism, and a fixed frame. The raw material silo is located on one side of the conveying mechanism, which is used to convey the old asphalt mixture to the elevator. The fixing frame is fixedly installed, and the heating device is fixedly installed on the fixing frame.