Recycled aggregate concrete stirring equipment and control method thereof

Abstract

The invention discloses stirring equipment for recycled aggregate concrete and a control method of the stirring equipment. The stirring equipment comprises a stirring bin, a stirring assembly is arranged in the stirring bin, and a circulating heating pipe set is arranged on the peripheral side of the stirring bin; the heating cylinder is communicated with the circulating heating pipe group to form a circulating flow channel for circulating a heat exchange medium; the carbon dioxide storage tank communicates with the interior of the stirring bin and is used for providing carbon dioxide into the stirring bin; the carbon dioxide generating device comprises a combustion furnace and a gas collecting pipe, one end of the gas collecting pipe is communicated with the combustion furnace, the other end of the gas collecting pipe is communicated with the carbon dioxide storage tank, and the middle of the gas collecting pipe is a coil pipe section which is arranged in the heating cylinder to heat the heat exchange medium in the heating cylinder. According to the system and the method, the utilization efficiency of energy and substances is improved, emission and waste are reduced, a closed-loop production mode from recycled aggregate production and carbonization treatment to finished concrete production is formed through combination of hardware equipment and a software control system, and the overall efficiency and sustainability of an industrial chain are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and particularly relates to a stirring device for recycled aggregate concrete and a control method thereof. Background Art

[0002] With the development of the urbanization process in China, the emissions of construction waste have been increasing year by year. Most of the construction waste is transported to the suburbs or the outskirts of the city for simple landfill or open storage without any treatment, which not only wastes land and resources but also pollutes the environment. On the other hand, with the increasing population, the demand for sand and gravel aggregates in the construction industry is constantly growing. For a long time, due to the wide availability and low price of sand and gravel aggregates, they have been regarded as inexhaustible raw materials and have been randomly mined, seriously damaging the natural environment. The production and utilization of recycled aggregates from construction waste are of great significance for saving resources, protecting the environment, and realizing the sustainable development of the construction industry.

[0003] The concrete prepared by incorporating recycled aggregates is called recycled aggregate concrete, abbreviated as recycled concrete. Using recycled aggregates in concrete can greatly reduce the landfill of construction waste. However, due to the high porosity and water absorption of recycled aggregates, the quality of the concrete produced with them may be unqualified compared with the concrete using conventional aggregates. To solve this problem, people have studied injecting CO2 into cement-based materials to improve the overall performance of recycled aggregate concrete. At the same time, through chemical methods, CO2 is permanently converted into stone. Through carbonization treatment, the physical and mechanical properties of recycled aggregate concrete can be the same as those of the original aggregate concrete.

[0004] At present, carbonization treatment is a feasible way to improve the performance of recycled aggregate concrete. Carbonization treatment mainly injects CO2 into recycled aggregates, which can make recycled aggregate concrete have good mechanical properties and durability. Carbonization treatment can quickly and completely carbonize recycled aggregates, thereby improving the mechanical properties and durability of concrete. In the prior art, mostly the cement slurry containing recycled aggregates is first stirred well, and then the cement slurry is carbonized using equipment. Due to the lack of a dedicated production equipment for the stirring and carbonization treatment of recycled aggregate concrete, the production and carbonization efficiency of recycled aggregate concrete are greatly reduced. Summary of the Invention

[0005] Aiming at the problem that the production and carbonization treatment of recycled aggregate concrete in the prior art need to be carried out step by step in different equipment, and the production efficiency is too low, and there is a lack of an efficient production equipment for recycled aggregate concrete, the present application proposes a stirring device for recycled aggregate concrete and a control method thereof.

[0006] The technical solution adopted by the invention is: a stirring device for recycled aggregate concrete, comprising: a stirring bin, in which a stirring assembly is arranged, and a circulating heating pipe group is arranged on the periphery of the stirring bin; a heating cylinder, which is communicated with the circulating heating pipe group to form a circulating flow path for the circulating heat transfer medium; a carbon dioxide storage tank, which is communicated with the inside of the stirring bin for providing carbon dioxide into the stirring bin; a carbon dioxide generating device, which comprises a combustion furnace and a gas collecting pipe, one end of the gas collecting pipe is communicated with the combustion furnace, the other end is communicated with the carbon dioxide storage tank, and the middle part of the gas collecting pipe is a coiled pipe section, and the coiled pipe section is arranged in the heating cylinder to heat the heat transfer medium inside the heating cylinder.

[0007] Further, the stirring bin comprises a barrel body and a cover body, the circulating heating pipe group is embedded inside the inner wall of the barrel body, the stirring assembly is arranged on the cover body, and the stirring assembly comprises a driving mechanism arranged outside the cover body and a stirring mechanism arranged inside the cover body.

[0008] Further, the stirring mechanism comprises a main shaft, stirring paddles and scraping plates, the main shaft penetrates through the cover body rotatably, the end of the main shaft outside the cover body is in transmission connection with the driving mechanism, several groups of the stirring paddles are arranged in the axial direction of the main shaft, several scraping plates are connected to the main shaft and are parallel to the main shaft, and the scraping plates are arranged close to the inner wall of the barrel body.

[0009] Further, a pair of fixing frames are arranged on the main shaft, the fixing frames are arranged in the axial direction of the main shaft, two ends of the scraping plate are respectively rotatably connected with the fixing frames, and the axis of the scraping plate is parallel to the axis of the main shaft.

[0010] Further, the carbon dioxide generating device further comprises a gas mixture tank in which oxygen and methane are mixed, and the gas mixture tank is communicated with the combustion furnace.

[0011] Further, the carbon dioxide generating device further comprises a gas-liquid separator arranged outside the heating cylinder, the inlet of the gas-liquid separator is communicated with the coiled pipe section, and the outlet of the gas-liquid separator is communicated with the carbon dioxide storage tank through the gas collecting pipe.

[0012] Further, a pressure sensor, a pressure relief valve, a temperature sensor and a humidity sensor are further arranged in the stirring bin, a first control valve for adjusting the flow rate and controlling the on-off is arranged on the connecting pipeline between the carbon dioxide storage tank and the stirring bin, and the stirring device further comprises a control system, and the control system is in signal connection with the pressure sensor, the pressure relief valve, the first control valve, the temperature sensor and the humidity sensor.

[0013] Further, the combustion furnace is also communicated with the stirring bin through an air supply pipe, the air supply pipe is provided with a second control valve for adjusting the flow rate and controlling the on-off, and the second control valve is signal-connected to the control system.

[0014] Further, the stirring device further includes a humidity regulator communicated with the inside of the stirring bin, and the humidity regulator is signal-connected to the control system.

[0015] A control method for a stirring device of recycled aggregate concrete, the control method comprising: Step S1, adding recycled aggregate concrete into the stirring bin; Step S2, burning a mixed gas of methane and oxygen in a combustion furnace to generate a high-temperature gas of carbon dioxide and water, the high-temperature gas collected by the gas collecting pipe flows through a heating cylinder to heat a heat exchange medium in the heating cylinder, the heat exchange medium circulates to heat the stirring bin, the water is condensed and separated from the carbon dioxide after the high-temperature gas flows through the heating cylinder, and the carbon dioxide enters a carbon dioxide storage tank for storage; Step S3, opening the carbon dioxide storage tank to supply carbon dioxide into the stirring bin to carbonize the recycled aggregate concrete; Step S4, the control system detects the humidity, temperature and pressure in the stirring bin, adjusts the humidity and / or temperature in the stirring bin by introducing the high-temperature gas generated by the combustion furnace, and controls the internal pressure of the stirring bin through a pressure relief valve of the stirring bin.

[0016] Compared with the prior art, the present invention can carbonize recycled aggregate concrete by using the high-temperature gas and carbon dioxide generated by the combustion furnace, can improve the performance and strength of recycled aggregate concrete, the carbonization treatment enhances the strength of the cement adhering to the surface of the recycled aggregate, improves the recycled aggregate itself, and ultimately helps to improve the quality of recycled aggregate concrete, and at the same time realizes the effective reuse of waste resources. The production process of recycled aggregate concrete adopts an environmentally friendly carbonization treatment method, which helps to reduce the dependence on natural resources and reduce the impact on the environment; at the same time, the technical solution makes full use of the heat energy and carbon dioxide generated during the operation of the carbon dioxide generating device, further improves the utilization efficiency of energy and materials, reduces emissions and waste, and through the combination of hardware equipment and software control system, enables the production equipment of recycled aggregate concrete to efficiently carry out carbonization treatment, forming a closed-loop production mode from the production of recycled aggregate, carbonization treatment to the production of finished concrete, and improving the overall efficiency and sustainability of the industrial chain. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 Schematic three-dimensional structure diagram of the stirring equipment in the present invention;

[0019] Figure 2 Schematic side structure diagram of the stirring equipment in the present invention;

[0020] Figure 3 Structure block diagram of the stirring equipment in the present invention;

[0021] Figure 4 Schematic cross-sectional structure diagram of the stirring bin in the present invention;

[0022] Figure 5 Schematic exploded structure diagram of the stirring bin in the present invention;

[0023] Figure 6 Schematic structure diagram of the cover body in the present invention;

[0024] Figure 7 Flowchart of the control method of the stirring equipment in the present invention.

[0025] The main reference numerals in this application are: 1, stirring bin; 2, circulating heating pipe group; 3, heating cylinder; 4, carbon dioxide storage tank; 5, carbon dioxide generating device; 51, combustion furnace; 52, gas collecting pipe; 11, barrel body; 12, cover body; 6, driving mechanism; 7, stirring mechanism; 71, main shaft; 72, stirring paddle; 73, scraping plate; 74, fixing frame; 53, mixed gas tank; 54, gas-liquid separator; 11, pressure sensor; 12, pressure relief valve; 13, temperature sensor; 14, air supply pipe; 8, first control valve; 9, second control valve; 10, control system. Detailed implementation manners

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] This application proposes a regenerated aggregate concrete mixing equipment, in combination with the attached Figure 1 , 2As shown in the figure, it includes a mixing bin 1, a heating cylinder 3, a carbon dioxide storage tank 4, and a carbon dioxide generating device 5. The mixing bin 1 is the core component of the equipment, with a mixing assembly built inside to ensure uniform mixing of the concrete and a high-quality mixing effect. A circulating heating pipe group 2 is provided around the mixing bin 1, which is connected to the circulating heating pipe group 2 through the heating cylinder 3 to form a circulating flow path for circulating the heat exchange medium. The heating cylinder 3 is used to heat the heat exchange medium; the carbon dioxide storage tank 4 is connected to the inside of the mixing bin 1 to supply carbon dioxide to the mixing bin 1; and the carbon dioxide generating device 5 is used to prepare carbon dioxide gas and send the carbon dioxide into the carbon dioxide storage tank 4.

[0028] Combined with the attached Figure 1 , 4 , 5, and 6, the mixing bin 1 of the recycled aggregate concrete mixing equipment is composed of a barrel body 11 and a cover body 12. The circulating heating pipe group 2 is embedded inside the inner wall of the barrel body 11, which can realize heating and heat preservation of the mixing materials. A driving mechanism 6 and a mixing mechanism 7 are provided on the cover body 12 to be responsible for driving and realizing the mixing process. The mixing bin 1 is set to be detachable, and the driving mechanism 6 and the mixing mechanism 7 are set on the cover body 12, so that the cover body 12 can be removed for cleaning and maintenance of the mixing mechanism 7. When it is necessary to mix and carbonize the concrete, the cover body 12 seals the barrel body 11 to form a sealed space.

[0029] The mixing mechanism 7 includes a main shaft 71, mixing paddles 72, and scraping plates 73. The main shaft 71 rotatably penetrates the cover body 12 and operates by connecting to the driving mechanism 6. A number of groups of mixing paddles 72 are arranged in the axial direction of the main shaft 71, and their function is to circulate the materials and push them towards the edge of the barrel body 11, so as to achieve a uniform mixing effect. At the same time, a number of scraping plates 73 are also connected to the main shaft 71 and placed parallel to the main shaft 71. The scraping plates 73 are close to the inner wall of the barrel body 11, and their function is to scrape off the materials adhering to the inner wall of the barrel body 11 and re-inject them into the mixing to ensure thorough mixing. To stabilize the position of the scraping plates 73, fixing frames 74 are provided on the main shaft 71. These fixing frames 74 are arranged in the axial direction of the main shaft 71. The two ends of the scraping plates 73 are respectively connected to the fixing frames 74 and can rotate freely. The axis of the scraping plates 73 is parallel to the axis direction of the main shaft 71. Through the linkage with the fixing frames 74, the scraping plates 73 can maintain a stable position, will not shift or shake during the mixing process, and can rotate within a certain range, thus avoiding the problem of damage caused by hard contact between the scraping plates 73 and the concrete.

[0030] It should be further noted that: The scraper 73 is designed with an appropriate arc to perfectly fit the curvature of the inner wall of the barrel 11, ensuring that the scraper 73 can completely cover the inner wall of the barrel 11 and effectively scrape off the concrete material. The length of the scraper 73 is designed to match the length of the inner wall of the barrel 11 to ensure that it can cover the entire mixing chamber 1 during the mixing process. The width of the scraper 73 is designed moderately so that it can effectively scrape when in contact with the concrete without being too wide to cause an increase in energy consumption. The material of the scraper 73 is selected as a wear-resistant and corrosion-resistant hard alloy material, which has good wear resistance and strength.

[0031] The stirring paddle 72 is designed in a spiral shape, which can effectively push the concrete material to the edge of the barrel 11, promoting the circulating mixing of the material. The stirring paddle 72 is provided with multiple blades, and the number of blades is sufficient to fully stir the concrete, ensuring that all parts of the concrete are fully mixed. Multiple stirring paddles 72 are reasonably arranged in the barrel 11 to improve the mixing uniformity of the concrete and reduce the situation of dead corners and local concrete not being fully stirred.

[0032] Such a design and structure can provide the following advantages: By adopting the combination of the driving mechanism 6 and the stirring mechanism 7, the stirring paddle 72 and the scraper 73 can fully mix the recycled aggregate and the concrete raw material, ensuring the uniform distribution of the concrete components and improving the quality of the concrete; The scraper 73 is close to the inner wall of the barrel 11, which can scrape off the concrete material adhered to the wall and re-participate in the mixing, avoiding the problems of material accumulation and dead corners, and improving the uniformity and quality of the concrete.

[0033] Combined with the attached Figures 1 to 3 As shown in the figure, the carbon dioxide generating device 5 is the core structure of the mixing equipment, which is used to generate and store carbon dioxide gas. The carbon dioxide generating device 5 mainly consists of a combustion furnace 51, a gas collecting pipe 52, a mixed gas tank 53, a gas-liquid separator 54, etc. The combustion furnace 51 is one of the core components of the carbon dioxide generating device 5. It uses corresponding fuels such as methane or natural gas to generate high-temperature combustion gas through the combustion process. The fuel and air are fully mixed in the combustion furnace 51. After ignition and combustion, a large amount of heat energy and combustion products are generated, and the main product is carbon dioxide gas. The combustion furnace 51 should have high thermal efficiency and reliability to ensure sufficient combustion and generate enough carbon dioxide gas. At the same time, in order to reduce the pollutants and impurities in the combustion products, a gas purifier can be set in the combustion furnace 51 for purification treatment to improve the quality of carbon dioxide.

[0034] The gas collecting pipe 52 is connected to the combustion furnace 51 and is a pipeline used to transfer the generated carbon dioxide gas from the combustion furnace 51 to the carbon dioxide storage tank 4. It is made of materials with high temperature resistance and corrosion resistance, such as stainless steel. A coil pipe section is provided in the middle of the gas collecting pipe 52. The coil pipe section is located inside the heating cylinder 3 and exchanges heat with the heat exchange medium inside the heating cylinder 3 to heat the heat exchange medium, so as to reach the required high temperature condition. An insulating layer can be provided outside the heating cylinder 3 to maintain the heating effect and save energy; the coil pipe section is a key part of the gas collecting pipe 52. It usually adopts an efficient spiral coil structure to enable the gas to have sufficient contact and heat exchange therein. When the carbon dioxide gas passes through the coil pipe section, it exchanges heat with the heat exchange medium inside the heating cylinder 3. In this way, there is no need to configure other heating structures to heat the heat exchange medium, and the heat generated by combustion is recycled to maintain the temperature in the stirring bin 1, realizing efficient energy utilization and avoiding energy waste.

[0035] The mixed gas tank 53 contains mixed gas and is connected to the combustion furnace 51. The mixed gas tank 53 contains appropriate mixed gas such as oxygen and methane. The mixed gas tank 53 usually has a regulating device to adjust the proportion of the mixed gas as needed to achieve the best combustion effect and carbon dioxide generation efficiency. Safety measures such as a safety valve should also be set between the mixed gas tank 53 and the combustion furnace 51 to ensure the safe and stable operation of the gas system.

[0036] The gas-liquid separator 54 is a device used to separate the liquid and gas in the coil pipe section. The gas-liquid separator 54 is installed outside the heating cylinder 3 and is connected to the coil pipe section. The gas-liquid separator 54 can effectively separate the liquid water and carbon dioxide gas in the coil pipe section to ensure the purity and quality of the carbon dioxide gas. Thus, the high-temperature gas discharged from the combustion furnace 51 contains water vapor and carbon dioxide. The inlet of the gas-liquid separator 54 is connected to the coil pipe section through the gas collecting pipe 52, and the outlet of the gas-liquid separator 54 is connected to the carbon dioxide storage tank 4 through the gas collecting pipe 52. The high-temperature gas exchanges heat with the heat exchange medium through the coil pipe section, and the water vapor releases heat and condenses to form condensate. After passing through the gas-liquid separator 54, the condensate remains at the bottom of the gas-liquid separator 54, while the carbon dioxide gas enters the carbon dioxide storage tank 4 from the outlet of the gas-liquid separator 54. In this way, it can ensure that the separated high-purity carbon dioxide gas can be collected and stored, and at the same time, the heat exchange between the heating cylinder 3 and the coil pipe section is used for the condensation of water and separation from carbon dioxide.

[0037] Furthermore, the humidity, temperature, and pressure of the mixing bin 1 are all important parameter conditions for carbonizing recycled aggregate concrete. How to adjust these parameters is also an important part of this application. A pressure sensor 11, a pressure relief valve 12, a temperature sensor 13, and a humidity sensor are provided on the mixing bin 1. In addition, a first control valve 8 for adjusting the flow rate and controlling the on-off is provided on the pipeline connecting the mixing bin 1 and the carbon dioxide storage tank 4. A control system 10 is also equipped on the mixing equipment, and this system is signal-connected to the pressure sensor 11, the pressure relief valve 12, the first control valve 8, the temperature sensor 13, and the humidity sensor to realize real-time monitoring and control of the operating state of the equipment. The combustion furnace 51 is connected to the mixing bin 1 through a gas supply pipe 14, and a second control valve 9 for adjusting the flow rate and controlling the on-off is provided on the gas supply pipe 14. The second control valve 9 is also signal-connected to the control system 10.

[0038] Based on the above structure, combined with the attached Figure 7 , the mixing equipment control method includes:

[0039] Step S1: Add recycled aggregate concrete into the mixing bin 1. In this step, the recycled aggregate concrete is put into the mixing bin 1. The recycled aggregate concrete is made by recycling and reusing construction waste or waste concrete, and has the characteristics of environmental protection and sustainability. The mixing device in the mixing bin 1 fully stirs the recycled aggregate concrete evenly to ensure the quality and consistency of the material.

[0040] Step S2: Burn a mixed gas of methane and oxygen in the combustion furnace 51 to generate high-temperature gas, which contains carbon dioxide and water vapor. The high-temperature gas enters the heating cylinder 3 through the gas collecting pipe 52 and heats the heat exchange medium along the coil section. The heat exchange medium inside the heating cylinder 3 can be water or heat-conducting oil, and heat exchange is carried out with the gas in the coil section through heat conduction. This reduces the temperature of the gas in the coil section and increases the temperature of the heat exchange medium in the heating cylinder 3 to provide the required carbonization temperature.

[0041] At the same time, the liquid water generated by the condensation and separation of water in the heating cylinder 3 is discharged through the gas-liquid separator 54, while the carbon dioxide is separated and introduced into the carbon dioxide storage tank 4 for storage. The separated high-purity carbon dioxide can be used for the carbonization of recycled aggregate concrete.

[0042] Step S3: Open the carbon dioxide storage tank 4 and introduce the stored carbon dioxide into the mixing bin 1 to complete the carbonization treatment of the recycled aggregate concrete. By controlling the first control valve 8, the flow rate of carbon dioxide and the pressure entering the mixing bin 1 can be adjusted to ensure that the recycled aggregate concrete reacts with an appropriate amount of carbon dioxide. The carbonization treatment helps to improve the performance and strength of the concrete and promotes the combination of the aggregate and the cement gel.

[0043] Step S4: The control system 10 monitors the humidity, temperature, and pressure inside the mixing silo 1, obtains the real-time data inside the mixing silo 1 through the pressure sensor 11, temperature sensor 13, and humidity sensor, and transmits the data to the control system 10 for processing and analysis. The control system 10 controls the flow rate and on / off of the high-temperature gas generated by the combustion furnace 51 by adjusting the second control valve 9 according to the set parameters and feedback signals. When the humidity inside the mixing silo 1 is low, the carbon dioxide and water generated by the combustion furnace 51 can be directly sent into the mixing silo 1 to increase the humidity and carbon dioxide content inside the mixing silo 1. When the humidity inside the mixing silo 1 is sufficient, the low-water-content carbon dioxide in the carbon dioxide storage tank 4 is sent into the mixing silo 1 by opening the second control valve 9, so as to accurately control the humidity and temperature inside the mixing silo 1 to meet the conditions required during the carbonization process and ensure the quality and performance of the recycled aggregate concrete.

[0044] In addition, the mixing equipment can be additionally equipped with a humidity regulator. Through the signal connection with the control system 10, the humidity of the concrete can be adjusted as needed. The humidity regulator can adjust the humidity by controlling the water addition amount or the spray system to meet the humidity requirements during the carbonization process.

[0045] Through the above control method, the mixing equipment can achieve the carbonization treatment of the recycled aggregate concrete. At the same time, the control system 10 monitors and adjusts the key parameters during the mixing process to ensure the quality and stability of the recycled aggregate concrete. The application of this control method helps to improve the sustainability and environmental friendliness of the recycled aggregate concrete and promotes the effective utilization of construction waste.

[0046] The present invention can carry out the carbonization treatment of the recycled aggregate concrete by using the high-temperature gas and carbon dioxide generated by the combustion furnace 51, which can improve the performance and strength of the recycled aggregate concrete. The carbonization treatment enhances the strength of the cement attached to the surface of the recycled aggregate and improves the recycled aggregate itself, ultimately contributing to the improvement of the quality of the recycled aggregate concrete. At the same time, the effective reuse of waste resources is realized. The production process of the recycled aggregate concrete adopts an environmentally friendly carbonization treatment method, which helps to reduce the dependence on natural resources and the impact on the environment. At the same time, the heat energy and carbon dioxide generated during the operation of the carbon dioxide generating device 5 are fully utilized in the technical solution, further improving the utilization efficiency of energy and materials, reducing emissions and waste. Through the combination of the hardware equipment and the software control system 10, a closed-loop production mode from the production of recycled aggregates, carbonization treatment to the production of finished concrete is formed, improving the overall efficiency and sustainability of the industrial chain.

[0047] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A stirring device for recycled aggregate concrete, characterized in that, Comprising: A stirring bin (1) is provided with a stirring assembly inside, and a circulating heating pipe group (2) is arranged on the periphery of the stirring bin (1); A heating cylinder (3) is communicated with the circulating heating pipe group (2) to form a circulating flow path for the heat exchange medium; A carbon dioxide storage tank (4) is communicated with the inside of the stirring bin (1) to supply carbon dioxide to the inside of the stirring bin (1); A carbon dioxide generating device (5), the carbon dioxide generating device (5) includes a combustion furnace (51) and a gas collecting pipe (52), one end of the gas collecting pipe (52) is communicated with the combustion furnace (51), the other end is communicated with the carbon dioxide storage tank (4), and the middle part of the gas collecting pipe (52) is a coil pipe section, and the coil pipe section is arranged inside the heating cylinder (3) to heat the heat exchange medium inside the heating cylinder (3).

2. The stirring device for recycled aggregate concrete according to claim 1, characterized in that, The stirring bin (1) includes a barrel body (11) and a cover body (12), the circulating heating pipe group (2) is embedded inside the inner wall of the barrel body (11), the stirring assembly is arranged on the cover body (12), and the stirring assembly includes a driving mechanism (6) arranged outside the cover body (12) and a stirring mechanism (7) arranged inside the cover body (12).

3. The mixing equipment for recycled aggregate concrete according to claim 2, characterized in that, The stirring mechanism (7) includes a main shaft (71), stirring paddles (72) and scraping plates (73), which rotatably penetrate through the cover body (12), the end of the main shaft (71) outside the cover body (12) is in transmission connection with the driving mechanism (6), several groups of the stirring paddles (72) are arranged axially on the main shaft (71), several scraping plates (73) are connected to the main shaft (71) and are parallel to the main shaft (71), and the scraping plates (73) are arranged close to the inner wall of the barrel body (11).

4. The mixing equipment for recycled aggregate concrete according to claim 3, characterized in that, A pair of fixing frames (74) are arranged on the main shaft (71), the fixing frames (74) are arranged in the axial direction of the main shaft (71), both ends of the scraping plate (73) are rotatably connected to the fixing frames (74), and the axis of the scraping plate (73) is parallel to the axis direction of the main shaft (71).

5. The mixing equipment for recycled aggregate concrete according to claim 1, characterized in that, The carbon dioxide generating device (5) further includes a gas mixture tank (53), the gas mixture tank (53) is mixed with oxygen and methane, and the gas mixture tank (53) is communicated with the combustion furnace (51).

6. The stirring device for recycled aggregate concrete according to claim 5, characterized in that, The carbon dioxide generating device (5) further includes a gas-liquid separator (54) arranged outside the heating cylinder (3), the inlet of the gas-liquid separator (54) is communicated with the coil pipe section, and the outlet of the gas-liquid separator (54) is communicated with the carbon dioxide storage tank (4) through the gas collecting pipe (52).

7. The stirring device for recycled aggregate concrete according to claim 6, characterized in that, A pressure sensor (11), a pressure relief valve (12), a temperature sensor (13) and a humidity sensor are further provided in the mixing bin (1). A first control valve (8) for adjusting the flow rate and controlling the on / off is provided on the connecting pipeline between the carbon dioxide storage tank (4) and the mixing bin (1). The mixing equipment further includes a control system (10), and the control system (10) is signal-connected to the pressure sensor (11), the pressure relief valve (12), the first control valve (8), the temperature sensor (13) and the humidity sensor.

8. The mixing equipment for recycled aggregate concrete according to claim 7, characterized in that, The combustion furnace (51) is further communicated with the mixing bin (1) through an air supply pipe (14). The air supply pipe (14) is provided with a second control valve (9) for adjusting the flow rate and controlling the on / off. The second control valve (9) is signal-connected to the control system (10).

9. The stirring device for recycled aggregate concrete according to claim 8, characterized in that, The mixing equipment further includes a humidity regulator communicated with the inside of the mixing bin (1), and the humidity regulator is signal-connected to the control system (10).

10. A control method for a mixing device of recycled aggregate concrete according to any one of claims 1 to 9, characterized in that, The control method includes: Step S1, adding recycled aggregate concrete into the mixing bin; Step S2, burning a mixed gas of methane and oxygen in the combustion furnace to generate a high-temperature gas of carbon dioxide and water. The high-temperature gas collected by the gas collecting pipe flows through the heating cylinder to heat the heat exchange medium in the heating cylinder. The heat exchange medium circulates to heat the mixing bin. After the high-temperature gas flows through the heating cylinder, the water is condensed and separated from the carbon dioxide, and the carbon dioxide enters the carbon dioxide storage tank for storage; Step S3, opening the carbon dioxide storage tank to supply carbon dioxide into the mixing bin to carbonize the recycled aggregate concrete; Step S4, the control system detects the humidity, temperature and pressure in the mixing bin, adjusts the humidity and / or temperature in the mixing bin by introducing the high-temperature gas generated by the combustion furnace, and controls the internal pressure of the mixing bin through the pressure relief valve of the mixing bin.

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