In-place hot recycled asphalt mixture mixing device and mixer

Abstract

The application relates to the technical field of in-situ heat regeneration and road maintenance, in particular to a mixing device and a mixer for in-situ heat regeneration asphalt mixture. The mixing device for in-situ heat regeneration asphalt mixture comprises a mixer body and a waste gas treatment system. The waste gas treatment system comprises a waste gas collecting section, an extendable adjusting section and a fixed connecting section which are sequentially communicated. When the second hose is unwound or wound on the rotating disc mechanism, the third hose automatically performs the compensation movement of extending or retracting correspondingly, so that the continuity and sealing property of the first hose, the second hose and the third hose are maintained. Through the integrated waste gas treatment system, the effect that the toxic volatile matters of asphalt generated in the mixing process are collected and treated in time is achieved, and the safety hidden danger that the operating personnel are forced to inhale the harmful gas in the prior art is effectively solved.

Description

Technical Field

[0001] This application relates to the fields of in-situ thermal recycling technology and road maintenance technology, specifically to a mixing device and mixer for in-situ thermal recycled asphalt mixture. Background Technology

[0002] Currently, in-situ thermal recycling technology is mainly used in asphalt pavement repair projects. This technology uses specialized heating equipment to soften the asphalt pavement, then uses mechanical devices to loosen the softened pavement material, mixes it with newly prepared recycled asphalt mixture, and finally completes the pavement repair through a compaction process.

[0003] In existing asphalt pavement repair projects, there is no structure for cleaning and discharging exhaust gases during the asphalt mixture mixing process, and the resulting emissions are simply and crudely emitted directly.

[0004] The existing technical solutions described above have the following drawbacks: During the mixing process of asphalt mixtures, due to the toxicity of asphalt itself and the need for heat treatment, waste gases and even harmful gases are inevitably generated. Operators typically monitor the work near the equipment, making it difficult to avoid inhaling these waste gases or toxic volatiles, posing potential health hazards. This problem is particularly prominent in confined working environments with limited ventilation, such as tunnels, mines, and underground parking garages, where the safety risks increase exponentially. Summary of the Invention

[0005] This application addresses the problem of toxic gases posing a hazard to operators when mixing asphalt in a closed or semi-closed environment by providing a mixing device and mixer for in-situ thermally recycled asphalt mixtures.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution:

[0007] This application provides a mixing device for in-situ thermally recycled asphalt mixture, comprising:

[0008] The mixer body includes a mixing tank and a mixing assembly disposed within the mixing tank, the mixing assembly being used to mix and heat asphalt material;

[0009] The exhaust gas treatment system includes an exhaust gas collection section, a retractable and adjustable section, and a fixed connection section connected in sequence. The exhaust gas collection section is connected to the top cover of the mixing tank via a first flexible hose for collecting exhaust gas generated during mixing. The retractable and adjustable section includes a second flexible hose and a turntable mechanism. The second flexible hose is retractably wound around the turntable mechanism, and its unfolding or rewinding is achieved by the rotational movement of the turntable mechanism. The fixed connection section is connected to external exhaust gas treatment equipment via a third flexible hose, or the third flexible hose is directly connected to the external environment.

[0010] The exhaust gas treatment system is configured such that when the second hose is unfolded or retracted on the turntable mechanism, the third hose automatically extends or retracts accordingly to compensate for the extension or retraction, so as to maintain the continuity and sealing of the first hose, the second hose and the third hose.

[0011] In summary, this application has the following technical effects:

[0012] 1. Through an integrated waste gas treatment system, the toxic volatile substances of asphalt generated during the mixing process can be collected and treated in real time, effectively solving the safety hazard of operators being forced to inhale harmful gases in the existing technology.

[0013] 2. By setting up a three-stage hose linkage structure, continuous gas collection function can be maintained even when the equipment is moved.

[0014] 3. By setting up an adjustable section and utilizing the coordinated operation of the turntable mechanism and the hose, the equipment can automatically adjust the pipe length during mobile operation, always maintaining the airtightness of the system and avoiding the leakage problems caused by traditional fixed pipes when the equipment is moved.

[0015] 4. The equipment is particularly suitable for construction scenarios in enclosed spaces such as tunnels and underground garages by setting up a pipeline compensation mechanism. By directly exporting exhaust gas to the work area or connecting it to external treatment equipment, the air quality in confined spaces is significantly improved.

[0016] 5. The system achieves physical isolation between the source of harmful gases and operators, and the mixing operation can be completed through remote monitoring, fundamentally eliminating the risk of operators being exposed to toxic gases. While ensuring operational safety, this design allows the equipment to maintain continuous mobile operation capability, without interrupting the construction process due to exhaust gas treatment issues, thus improving the overall efficiency of thermal recycling construction. Attached Figure Description

[0017] Figure 1 This is an external structural diagram of the mixing device for the in-situ thermally recycled asphalt mixture of this application.

[0018] Figure 2 This is a structural diagram of the rotating bracket of this application.

[0019] Figure 3 This is a schematic diagram of the multi-level purification module of this application.

[0020] Figure 4 This is a schematic diagram of the mixer of this application.

[0021] Explanation of reference numerals in the attached figures

[0022] 100. Mixing device for in-situ thermally recycled asphalt mixture; 10. Mixer body; 11. Mixing tank; 111. Top cover; 112. Side wall; 113. Bottom; 114. Support base; 115. Transparent observation window; 12. Mixing assembly; 20. Exhaust gas treatment system; 21. Exhaust gas collection section; 211. First hose; 22. Telescopic adjustable section; 221. Second hose; 222. Turntable mechanism; 23. Fixed connection section; 231. Third hose; 30. Rotating bracket; 31. Fixed base; 32. Turntable assembly; 40. Forced ventilation assembly; 41. First fan; 42. Second fan; 50. Multi-stage purification module; 51. Primary physical filtration unit; 511. Filter element; 52. Chemical treatment unit; 53. Activated carbon adsorption unit; 200. Mixer; 201. Vehicle body. Detailed Implementation

[0023] The technical solutions in the embodiments of this specification 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.

[0024] In this specification, the accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to show the details of the local features more clearly.

[0025] Unless otherwise stated, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this specification. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items. The singular forms "a," "the," and "the" as used in this specification and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0026] In the description of this specification, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this specification, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In the description of this specification, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description in this specification and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this application.

[0028] In the description of this specification, unless otherwise expressly defined, the terms "installation," "connection," "joining," "fixing," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this specification according to the specific circumstances.

[0029] Currently, in-situ thermal recycling technology has become the mainstream construction process in asphalt pavement repair projects due to its high efficiency and environmental friendliness. This technology uses infrared radiation heating or hot air circulation to uniformly soften the old asphalt pavement. Then, a milling device loosens the softened pavement material to a predetermined depth, and newly formulated recycling agents and asphalt mixtures are added in proportion. Finally, the pavement is repaired through paving and compaction. This technology achieves a high recycling rate of old asphalt mixtures and significantly reduces the generation of construction waste.

[0030] However, this process presents serious safety hazards: during asphalt mixing, the asphalt material releases toxic gases containing benzo[a]pyrene, sulfides, and nitrogen oxides when heated to 160-180℃. Existing equipment generally lacks effective waste gas collection and treatment systems, resulting in volatile organic compound (VOC) concentrations at the work site frequently exceeding occupational exposure limits. Operators inevitably inhale these harmful substances during close-range operations such as quality monitoring and equipment debugging, and long-term exposure may lead to respiratory diseases and even cancer risks. Particularly in semi-enclosed or fully enclosed working environments such as tunnels, underground parking garages, and urban underground utility tunnels, poor air circulation allows harmful gases to accumulate, further exacerbating occupational health risks. Furthermore, the difficulty in discharging waste gases in these confined spaces can cause secondary pollution, impacting the surrounding environment. Current technologies have not effectively addressed these safety and environmental issues, severely hindering the widespread application of in-situ thermal recycling technology in special environments.

[0031] Please see Figures 1 to 4 This application provides a mixing device 100 for in-situ thermally recycled asphalt mixture. The mixing device 100 includes a mixer body 10 and an exhaust gas treatment system 20. The mixer body 10 includes a mixing tank 11 and a mixing assembly 12 disposed within the mixing tank 11. The mixing assembly 12 is used to mix and heat the asphalt mixture. The exhaust gas treatment system 20 includes an exhaust gas collection section 21, a retractable adjustment section 22, and a fixed connection section 23 connected in sequence. The exhaust gas collection section 21 is connected to the upper cover 111 of the mixing tank 11 via a first flexible hose 211, and is used to collect exhaust gas generated during the mixing process. The retractable adjustment section... 22 includes a second hose 221 and a turntable mechanism 222. The second hose 221 is retractably wound around the turntable mechanism 222, and the second hose 221 is unfolded or retracted by the rotation of the turntable mechanism 222. The fixed connection section 23 is connected to an external exhaust gas treatment device (not shown in the figure) through a third hose 231 or the third hose 231 is directly connected to the external environment. The exhaust gas treatment system 20 is configured such that when the second hose 221 is unfolded or retracted on the turntable mechanism 222, the third hose 231 automatically performs a compensating movement of extending or retracting to maintain the continuity and sealing of the first hose 211, the second hose 221 and the third hose 231.

[0032] In this embodiment, the mixing device 100 for in-situ thermal recycled asphalt mixture includes: a mixer body 10 and an exhaust gas treatment system 20. The mixer body 10 includes a mixing tank 11 and a mixing assembly 12 disposed within the mixing tank 11. The mixing assembly 12 is used to mix and heat the asphalt mixture. The exhaust gas treatment system 20 includes an exhaust gas collection section 21, a retractable adjustment section 22, and a fixed connection section 23 connected in sequence. The exhaust gas collection section 21 is connected to the upper cover 111 of the mixing tank 11 via a first flexible hose 211 to collect the exhaust gas generated during the mixing process. The retractable adjustment section 22 includes a second flexible hose 221 and a... The rotary mechanism 222 includes a second flexible hose 221 that is retractably wound around it. The rotation of the rotary mechanism 222 allows the second flexible hose 221 to expand or retract. A fixed connecting section 23 connects to external exhaust gas treatment equipment via a third flexible hose 231, or the third flexible hose 231 directly connects to the external environment. The exhaust gas treatment system 20 is configured such that when the second flexible hose 221 expands or retracts on the rotary mechanism 222, the third flexible hose 231 automatically extends or retracts to compensate for this, maintaining the continuity and sealing of the first flexible hose 211, the second flexible hose 221, and the third flexible hose 231. Thus, the integrated exhaust gas treatment system 20 enables the immediate collection and treatment of toxic volatile asphalt gases generated during mixing, effectively solving the safety hazard of operators being forced to inhale harmful gases in existing technologies. In particular, the adoption of a three-stage hose linkage structure ensures continuous gas collection even during equipment movement. The innovative design of the extendable adjustable section 22, through the coordinated operation of the turntable mechanism 222 and the flexible hose, allows the equipment to automatically adjust the pipe length during mobile operations, maintaining the system's airtightness and avoiding leakage problems that occur when traditional fixed pipes are moved. The unique pipe compensation mechanism makes the equipment particularly suitable for construction scenarios in enclosed spaces such as tunnels and underground parking garages. By directly venting exhaust gases to the work area or connecting to external treatment equipment, it significantly improves air quality in confined spaces. The system achieves physical isolation between the source of harmful gases and operators, and the mixing operation can be completed through remote monitoring, fundamentally eliminating the risk of operator exposure to toxic gases. While ensuring operational safety, this design allows the equipment to maintain continuous mobile operation capabilities without interrupting the construction process due to exhaust gas treatment issues, improving the overall efficiency of thermal recycling construction.

[0033] This embodiment provides an on-site thermal recycling asphalt mixture mixing device with exhaust gas treatment function. The device mainly consists of two parts: a mixer body 10 and an exhaust gas treatment system 20. The mixer body 10 adopts a double-layer insulation structure design, including a cylindrical mixing tank 11 and a spiral mixing component 12 installed inside the tank. The mixing component 12 is equipped with an electric heating system, which can uniformly mix and heat the asphalt mixture at an operating temperature of 160-180℃.

[0034] The exhaust gas treatment system 20 adopts a three-stage segmented pipeline design, including: exhaust gas collection section 21: sealed connection to the exhaust gas outlet of the mixing tank 11 cover 111 via a high-temperature resistant first flexible hose 211, with a funnel-shaped collection port to improve collection efficiency; telescopic adjustable section 22: composed of a second flexible hose 221 made of special material and an electric turntable mechanism 222, with the second flexible hose 221 installed on the turntable in a spiral winding manner, and the automatic extension and retraction of the hose achieved by driving the turntable with a servo motor; fixed connection section 23: connected to the mobile exhaust gas purification equipment via a third flexible hose 231, or directly connected to the outside of the working area.

[0035] Specifically, the exhaust gas treatment system 20 of this application embodiment has: dynamic sealing technology: the intelligent control system coordinates the turntable mechanism 222 and the pipe extension and retraction movement to ensure that the continuity and airtightness of the pipeline system are always maintained when the equipment moves; adaptive adjustment function: the pipeline length is automatically adjusted according to the position change of the mixing tank 11, and the maximum extension and retraction distance can reach 50 meters; modular design: each section of the pipeline adopts a quick-release connection method, which is convenient for maintenance and replacement.

[0036] Furthermore, in this embodiment, the exhaust gas collection efficiency is high, reducing the concentration of harmful gases in the work area to below the occupational exposure limit; it is particularly suitable for use in poorly ventilated environments such as tunnels and underground spaces, solving the safety hazards of traditional equipment operating in confined spaces. This embodiment is most practical in relatively enclosed application scenarios such as tunnels and underground spaces. Unmanned operation is achieved through a remote monitoring system, reducing personnel contact with hazardous areas and lowering the risk of work stoppages due to safety issues.

[0037] Furthermore, the system can be equipped with an optional exhaust gas purification module to achieve multi-stage treatment of harmful gases and meet the environmental emission standards of different regions. The overall design fully considers the actual conditions of the construction site, ensuring functionality while also emphasizing the reliability and economy of the equipment.

[0038] In some embodiments, the turntable mechanism 222 is rotatably mounted on the top cover 111 or side of the mixing tank 11 via a rotating bracket 30. The rotating bracket 30 includes a fixed base 31 and a turntable assembly 32 that can rotate relative to each other. The fixed base 31 is fixedly connected to the mixing tank 11, and the turntable assembly 32 is used to support and adjust the extension and retraction state of the second hose 221.

[0039] Thus, by mounting the turntable mechanism 222 on the rotating bracket 30 on the top cover 111 or side of the mixing tank 11, a compact integration of the exhaust gas treatment system 20 and the mixing device is achieved, significantly saving equipment installation space and making it particularly suitable for deployment in confined construction environments. The design of the fixed base 31 and rotating component of the rotating bracket 30 allows the second hose 221 to rotate freely with the turntable assembly 32, flexibly adjusting the extension direction and angle of the exhaust gas collection pipe according to site requirements, improving system adaptability. The load-bearing design of the turntable assembly 32 ensures that the second hose 221 maintains stable movement during extension and retraction, preventing pipe twisting or jamming. Simultaneously, the rigid connection between the fixed base 31 and the mixing tank 11 enhances the overall structural stability. The modular design of the rotating bracket 30 allows the turntable mechanism 222 to be independently disassembled and maintained without the need for complete disassembly of the exhaust gas treatment system 20, greatly reducing the difficulty and workload of equipment maintenance. The optimized turntable installation position and structural design ensure that the hose maintains good sealing performance during extension and retraction, effectively preventing the leakage of harmful gases.

[0040] In some preferred embodiments, the turntable mechanism 222 adopts a modular rotating bracket 30 design, which can be flexibly configured on the top cover 111 or the side of the mixing tank 11. The rotating bracket 30 mainly includes the following components: a fixed base 31: rigidly fixed to the mixing tank 11 by a flange connection, and adopts a shock-absorbing design to reduce vibration transmission; a turntable assembly 32: including bearings and a gear transmission system, driven by a motor to achieve controllable rotation; and a guide mechanism: equipped with a limit device and an angle sensor for controlling the extension and retraction position of the hose.

[0041] Specifically, the compact integrated solution significantly saves equipment space, making it particularly suitable for space-constrained construction scenarios. The rotary table mechanism 222 offers multiple selectable configurations, allowing for the selection of the optimal installation location based on site conditions. Equipped with an automatic centering system, it optimizes hose operation; this design demonstrates excellent reliability in practical applications, effectively extending hose lifespan, significantly reducing maintenance difficulty, and ensuring no leakage of harmful gases. The rotary table mechanism 222 can also be linked with the control system to automatically adjust the hose position according to construction needs, enhancing the level of construction automation. This innovative design solves the problems of bulky and difficult-to-maintain traditional exhaust gas collection systems, providing a new technical solution for the miniaturization and intelligent development of equipment.

[0042] In some embodiments, a forced ventilation assembly 40 is also included, comprising: a first fan 41 installed at the air inlet end of the first hose 211 for extracting exhaust gas from the mixing tank 11; and / or a second fan 42 provided at the air outlet end of the third hose 231 for ensuring a negative pressure state in the second hose 221.

[0043] Thus, by installing the first fan 41 at the air inlet of the first hose 211, an active suction system is formed, significantly improving the collection efficiency of harmful gases in the mixing tank 11, ensuring that exhaust gases are effectively captured, and preventing the leakage of toxic gases. The negative pressure state established by the second fan 42 at the air outlet of the third hose 231 creates a stable airflow channel for the entire exhaust gas treatment system 20, effectively preventing exhaust gas leakage caused by gas backflow or pressure fluctuations. The dual-fan configuration can automatically adjust the airflow according to the amount of exhaust gas generated, increasing the suction force during the mixing and heating stage and reducing energy consumption during the intermittent stage, achieving intelligent operation. The dual-fan redundancy design ensures that the system can still maintain basic operation when either fan fails, greatly improving the reliability and safety of equipment operation. It is particularly suitable for poorly ventilated places such as tunnels, ensuring that exhaust gases are quickly discharged from the work area through forced ventilation, protecting the health and safety of construction personnel.

[0044] In this embodiment, the first fan 41 (front-mounted induced draft fan) is installed at the air inlet of the first flexible hose 211 and adopts frequency conversion control technology to automatically adjust the suction power according to the exhaust gas concentration. The second fan 42 (rear-mounted booster fan) is located at the air outlet of the third flexible hose 231 and is equipped with a pressure sensor to maintain the system's negative pressure state in real time. The linkage control system enables the two fans to work together and optimizes airflow organization. This not only solves the problem of low exhaust gas collection efficiency of traditional equipment but also greatly reduces the difficulty of manual operation through automated control, providing a safer and more reliable environmental guarantee for asphalt hot recycling construction. The modular design of the system also facilitates later maintenance and functional expansion, and the configuration can be flexibly adjusted according to different project needs.

[0045] In some embodiments, the exhaust gas treatment system 20 further includes a multi-stage purification module 50, which includes:

[0046] Primary physical filtration unit 51, disposed in the first flexible hose 211 section, is used to remove particulate matter from exhaust gas; and / or

[0047] Chemical treatment unit 52 employs a built-in alkaline solution for neutralizing acidic gases; and / or

[0048] Activated carbon adsorption unit 53 is used to adsorb volatile organic compounds;

[0049] Among them, the multi-stage purification module 50 adopts a modular design and can be selectively connected in series in the pipeline of the exhaust gas treatment system 20.

[0050] Thus, through a three-stage purification process of "physical filtration - chemical neutralization - adsorption treatment," a full spectrum of purification of particulate matter, acidic gases, and volatile organic compounds in asphalt exhaust gas is achieved, with high purification efficiency. The detachable modular design allows for flexible combination of purification units based on the characteristics of exhaust gas composition in different engineering scenarios (such as tunnel engineering with higher acidic gas content), improving system adaptability. Each purification unit is independently packaged, allowing for quick replacement when a unit becomes saturated or fails, eliminating the need for system shutdown and maintenance, significantly reducing maintenance costs. The pre-positioning design of the primary physical filtration unit 51 effectively protects the subsequent chemical treatment unit 52 and activated carbon unit, preventing particulate matter blockage and extending the service life of the advanced purification units.

[0051] In some preferred embodiments, the exhaust gas treatment system 20 innovatively adopts modular multi-stage purification technology, with the following graded purification unit configuration: primary mechanical filtration unit: located at the front end of the system, including a cyclone separator and a high-efficiency filter for dual filtration, effectively intercepting particles larger than 5μm in diameter; chemical washing treatment unit: adopting a spray tower structure with a built-in automatic pH adjustment system, which can precisely control the concentration of alkaline solution; advanced adsorption purification unit: equipped with a honeycomb activated carbon filter element, which has an ultra-large specific surface area adsorption capacity.

[0052] In some embodiments, the primary physical filtration unit 51 includes a filter element 511 that prevents solids from entering the hose.

[0053] Thus, by setting up a dedicated filter element 511, solid particles and tar condensates in asphalt exhaust gas can be effectively intercepted, preventing them from entering the hose system and causing blockages, ensuring the long-term stable operation of the exhaust gas treatment system 20. Preventing solid particles from entering the hose system and causing wear and corrosion to subsequent critical components such as fans and valves significantly extends equipment lifespan and reduces maintenance costs. Pre-filtering reduces the load on subsequent chemical treatment units 52 and activated carbon adsorption units 53, allowing advanced purification units to focus more on treating gaseous pollutants, thus improving overall system purification efficiency. It prevents the risk of blockage caused by the accumulation of large particles in the pipeline, ensuring unobstructed airflow in the exhaust gas treatment system 20 and avoiding safety hazards due to excessive back pressure. The design of the quick-disassembly filter element 511 facilitates daily cleaning and replacement, and maintenance can be performed without stopping the system, ensuring continuous operation.

[0054] In some embodiments, the first hose 211 is a corrugated pipe.

[0055] Thus, the corrugated pipe structure significantly improves the flexibility and bendability of the first flexible hose 211, enabling it to adapt to the vibration and displacement of the mixing tank 11's cover 111 during operation and maintain a stable exhaust gas collection effect. The corrugated pipe's unique heat dissipation structure design effectively reduces the thermal shock of high-temperature exhaust gas to the pipe body. The corrugated structure on the inner wall of the corrugated pipe can create a turbulence effect, which helps prevent asphalt particles from depositing on the pipe wall and improves the uniformity of exhaust gas flow.

[0056] In some embodiments, the length of the second hose 221 is greater than or equal to 50m. For example, the length of the second hose 221 can be 50m, 55m, 60m, 65m, 70m, 75m, 80m, 85m, 90m, 95m, 100m, 105m, 110m, 115m, 120m, 125m, 130m, 135m, 140m, 145m, 150m, 155m, 160m, 165m, 170m, 175m, 180m, 185m, 190m, 195m, or 200m.

[0057] Thus, by configuring a second flexible hose 221 with a length ≥50m, the effective operating radius of the mixing device is significantly expanded, enabling it to cover a wider road construction area and significantly improving the efficiency of single-machine operation. The extra-long hose design, combined with the turntable mechanism 222, allows the equipment to collect exhaust gases over a large construction area without frequent relocation of the main unit during continuous operation; the hose's extension and retraction are sufficient. The long hose allows the exhaust gas treatment equipment to be placed outside the work area, ensuring purification effectiveness while preventing the treatment equipment from obstructing on-site construction operations. This is particularly suitable for special construction scenarios requiring long-distance exhaust gas diversion, such as large overpasses and extra-long tunnels, ensuring that harmful gases are effectively transported to the treatment area. A single system can meet the needs of large-scale operations, significantly reducing equipment investment and operating costs compared to solutions involving multiple short-distance devices in parallel.

[0058] In some embodiments, the mixing tank 11 includes an upper cover 111, a side wall 112, and a lower bottom 113, as well as a support base 114 disposed on the lower bottom 113. The upper cover 111, the side wall 112, and the lower bottom 113 cooperate to define the interior of the mixing tank 11.

[0059] Thus, the three-section sealing structure of the upper cover 111, side wall 112, and lower bottom 113 forms a complete sealed mixing space, effectively preventing the leakage of harmful gases during asphalt mixing. The modular design allows for the use of different insulation materials for each part (such as enhanced insulation for the upper cover 111 and an added heating layer for the side wall 112), significantly improving thermal energy utilization. Each component can be disassembled independently, facilitating the inspection and maintenance of the internal mixing assembly 12 and the cleaning of the tank, reducing maintenance time. The integrated design of the support base 114 and lower bottom 113 ensures stability during movement and operation, improving vibration resistance. The sealed structure, combined with the exhaust gas collection system, provides double protection, reducing the risk of operators being exposed to harmful gases.

[0060] In some embodiments, the sidewall 112 is provided with at least one transparent observation window 115, which is used by the operator to observe the stirring status.

[0061] Thus, by setting up a transparent observation window 115, operators can directly observe the mixing state of the materials inside the mixing tank 11, monitor the mixing quality in real time, and avoid the quality control problems caused by traditional blind mixing. The observation window adopts a multi-layer protective design, effectively isolating the internal high-temperature and high-pressure environment while ensuring the observation function, ensuring the safety of the observation process. Operators do not need to frequently open the cover for inspection; routine status monitoring can be completed through the observation window, significantly simplifying the operation process and improving work efficiency. The visible window helps to promptly detect mixing abnormalities (such as material agglomeration, deformation of the mixing arm, etc.), facilitating quick diagnosis and handling of equipment malfunctions. Furthermore, by directly observing the state of the mixture, it provides an intuitive reference for adjusting mixing parameters (such as temperature, speed, etc.), which helps to optimize the recycled material proportioning process.

[0062] Secondly, this application provides a mixer 200, which includes a vehicle body 201 and a mixing device 100 for in-situ hot recycled asphalt mixture according to any of the above embodiments, wherein the mixing device 100 for in-situ hot recycled asphalt mixture is disposed on the vehicle body 201.

[0063] In this embodiment of the application, the specific form of the mixer 200 is not limited. The mixer 200 can transport the mixing device 100 of the in-situ hot recycled asphalt mixture to the required location, and then operate through the mixing device 100 of the in-situ hot recycled asphalt mixture.

[0064] This application provides a mixing device 100 and a mixer 200 for in-situ thermally recycled asphalt mixtures. The mixing device 100 includes a mixer body 10 and an exhaust gas treatment system 20. The mixer body 10 includes a mixing tank 11 and a mixing assembly 12 disposed within the mixing tank 11. The mixing assembly 12 is used to mix and heat the asphalt mixture. The exhaust gas treatment system 20 includes an exhaust gas collection section 21, a retractable adjustment section 22, and a fixed connection section 23 connected in sequence. The exhaust gas collection section 21 is connected to the upper cover 111 of the mixing tank 11 via a first flexible hose 211, and is used to collect exhaust gas generated during the mixing process. The retractable adjustment section 22 includes a second flexible hose 221 and a rotary table. The first hose 211, second hose 221, is retractably wound around the turntable mechanism 222. The rotation of the turntable mechanism 222 allows the second hose 221 to expand or retract. The fixed connection section 23 connects to external exhaust gas treatment equipment via a third hose 231, or the third hose 231 directly connects to the external environment. The exhaust gas treatment system 20 is configured such that when the second hose 221 expands or retracts on the turntable mechanism 222, the third hose 231 automatically extends or retracts to compensate for this, maintaining the continuity and sealing of the first hose 211, second hose 221, and third hose 231. Thus, the integrated exhaust gas treatment system 20 achieves immediate collection and treatment of toxic volatile asphalt gases generated during mixing, effectively solving the safety hazard of operators being forced to inhale harmful gases in existing technologies. In particular, the use of a three-stage hose linkage structure ensures continuous gas collection even during equipment movement. The innovative design of the extendable adjustable section 22, through the coordinated operation of the turntable mechanism 222 and the flexible hose, allows the equipment to automatically adjust the pipe length during mobile operations, maintaining the system's airtightness and avoiding leakage problems that occur when traditional fixed pipes are moved. The unique pipe compensation mechanism makes the equipment particularly suitable for construction scenarios in enclosed spaces such as tunnels and underground parking garages. By directly venting exhaust gases to the work area or connecting to external treatment equipment, it significantly improves air quality in confined spaces. The system achieves physical isolation between the source of harmful gases and operators, and the mixing operation can be completed through remote monitoring, fundamentally eliminating the risk of operator exposure to toxic gases. While ensuring operational safety, this design allows the equipment to maintain continuous mobile operation capabilities without interrupting the construction process due to exhaust gas treatment issues, improving the overall efficiency of thermal recycling construction.

[0065] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0066] The functions and effects of this embodiment can be explained by referring to the foregoing implementation methods, and will not be repeated here.

[0067] It is understood that in the various embodiments of this specification, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this specification.

[0068] It is understood that the various implementation methods described in this specification can be implemented individually or in combination, and the embodiments in this specification are not limited in this respect.

[0069] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the aforementioned method implementations, and will not be repeated here.

[0070] The above are merely specific embodiments of this specification, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this specification should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A mixing device for in-situ thermally recycled asphalt mixture, characterized in that, include: The mixer body includes a mixing tank and a mixing assembly disposed within the mixing tank, the mixing assembly being used to mix and heat asphalt material; The exhaust gas treatment system includes an exhaust gas collection section, a retractable and adjustable section, and a fixed connection section connected in sequence. The exhaust gas collection section is connected to the top cover of the mixing tank via a first flexible hose for collecting exhaust gas generated during mixing. The retractable and adjustable section includes a second flexible hose and a turntable mechanism. The second flexible hose is retractably wound around the turntable mechanism, and its unfolding or rewinding is achieved by the rotational movement of the turntable mechanism. The fixed connection section is connected to external exhaust gas treatment equipment via a third flexible hose, or the third flexible hose is directly connected to the external environment. The exhaust gas treatment system is configured such that when the second hose is unfolded or retracted on the turntable mechanism, the third hose automatically extends or retracts accordingly to compensate for the extension or retraction, so as to maintain the continuity and sealing of the first hose, the second hose and the third hose.

2. The mixing device for in-situ thermal recycled asphalt mixture according to claim 1, characterized in that, The turntable mechanism is rotatably mounted on the top or side of the mixing tank via a rotating bracket. The rotating bracket includes a fixed base and a turntable assembly that can rotate relative to each other. The fixed base is fixedly connected to the mixing tank, and the turntable assembly is used to support and adjust the extension and retraction of the second hose.

3. The mixing device for in-situ thermal recycled asphalt mixture according to claim 1, characterized in that, It also includes a forced ventilation assembly, which comprises: A first fan installed at the air inlet end of the first hose is used to extract the waste gas from the mixing tank; And / or a second fan located at the outlet of the third hose, used to ensure the negative pressure state of the second hose.

4. The mixing device for in-situ thermal recycled asphalt mixture according to claim 1, characterized in that, The waste gas treatment system further includes a multi-stage purification module, which includes: A primary physical filtration unit, disposed in the first flexible hose section, is used to remove particulate matter from the exhaust gas; and / or The chemical treatment unit employs a built-in alkaline solution for neutralizing acidic gases; and / or Activated carbon adsorption unit, used to adsorb volatile organic compounds; The multi-stage purification module adopts a modular design and can be selectively connected in series in the pipeline of the waste gas treatment system.

5. The mixing device for in-situ thermal recycled asphalt mixture according to claim 4, characterized in that, The primary physical filtration unit includes a filter element that prevents solids from entering the hose.

6. The mixing device for in-situ thermal recycled asphalt mixture according to claim 1, characterized in that, The first flexible tube is a corrugated tube.

7. The mixing device for in-situ thermal recycled asphalt mixture according to claim 1, characterized in that, The length of the second hose is greater than or equal to 50m.

8. The mixing device for in-situ thermal recycled asphalt mixture according to claim 1, characterized in that, The mixing tank includes an upper cover, side walls, and a lower bottom, as well as a support base disposed on the lower bottom. The upper cover, the side walls, and the lower bottom cooperate to define the interior of the mixing tank.

9. The mixing device for in-situ thermal recycled asphalt mixture according to claim 8, characterized in that, The side wall is provided with at least one transparent observation window, which is used by the operator to observe the stirring status.

10. A mixer, characterized in that, The vehicle includes a vehicle body and a mixing device for in-situ thermally recycled asphalt mixture as described in any one of claims 1 to 9, wherein the mixing device for in-situ thermally recycled asphalt mixture is mounted on the vehicle body.

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