Apparatus and method for producing pre-mixed concrete by injecting carbon dioxide

Abstract

The application discloses a kind of equipment and method for preparing pre-mixed concrete by injecting carbon dioxide, equipment includes carbon dioxide injection device, transition bin device, environment bin device and material taking device, transition bin device includes transition bin body and outer bin door, environment bin device includes environment bin body, inner bin door and stirring mechanism, the addition of concrete raw materials and the sampling of pre-mixed concrete are all carried out intermediate transition by transition bin device, environment bin space is always in the state of isolation with the outside world, the environment in environment bin space will not be affected by discharging or sampling, carbon dioxide concentration is maintained around preset value, effectively improve the quality of pre-mixed concrete, and due to the stability of preparation environment, the experimental data obtained is also more reliable.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of ready-mixed concrete preparation, and particularly relates to a device and method for preparing ready-mixed concrete by injecting carbon dioxide. BACKGROUND

[0002] With the continuous development of industrialization, more and more steel plants and manufacturing plants are being built. The exploitation and combustion of fossil energy, and the large amount of carbon dioxide contained in the exhaust gas discharged by factories are important sources of greenhouse effect. For the cement and building material industry with extremely shocking carbon emission, a very effective solution is to realize the absorption and fixation of carbon dioxide through building materials, and the introduction of carbon dioxide can improve the strength of cement-based materials.

[0003] During the preparation of ready-mixed concrete, the amount of carbon dioxide, raw materials, processing time, etc. will affect the strength of cement-based materials. In order to obtain higher strength of cement-based materials, sampling tests need to be carried out during the preparation process. However, when sampling, the preparation equipment must be opened, the carbon dioxide environment in the equipment is destroyed, which affects the quality of ready-mixed concrete and the accuracy of experimental data. SUMMARY

[0004] In view of the above defects or deficiencies, the present application provides a device and method for preparing ready-mixed concrete by injecting carbon dioxide, aiming to solve the technical problem that the carbon dioxide environment in the equipment is destroyed due to the opening of the equipment, thereby affecting the quality of ready-mixed concrete and the accuracy of experimental data.

[0005] To achieve the above-mentioned purpose, the present application provides a device for preparing ready-mixed concrete by injecting carbon dioxide, wherein the device for preparing ready-mixed concrete by injecting carbon dioxide comprises a carbon dioxide injection device, a transition bin device, an environment bin device and a material taking device. The transition bin device comprises a transition bin body and an outer bin door, the transition bin body forms a transition bin space communicating with the carbon dioxide injection device, and the outer bin door is arranged on the transition bin body and is used to open or close the transition bin space. The environment bin device comprises an environment bin body, an inner bin door and a stirring mechanism, the environment bin body forms an environment bin space communicating with the transition bin space, the stirring mechanism is arranged in the environment bin space and is used to stir the ready-mixed concrete, and the inner bin door is arranged between the environment bin body and the transition bin body and is used to open or close the environment bin space. The material taking device is used to transfer the concrete raw materials in the transition bin space to the environment bin space and to transfer the ready-mixed concrete prepared in the environment bin space to the transition bin space when the outer bin door is closed.

[0006] In the embodiment of the present application, a first taking and placing opening is formed on the environment bin body, and the material taking device comprises a first taking and placing glove, which corresponds to the first taking and placing opening and is arranged on the environment bin body.

[0007] In the embodiment of the present application, the observation window is formed above the first taking and placing opening on the environment bin body, and the environment bin device further comprises a glass plate corresponding to the sealed observation window.

[0008] In the embodiment of the present application, the second taking and placing opening is formed on the transition bin body, and the taking device further comprises a second taking and placing glove corresponding to the sealed second taking and placing opening and arranged on the transition bin body.

[0009] In the embodiment of the present application, the device further comprises a carbon dioxide recovery device, which comprises a suction member and a recovery container for containing a carbon dioxide absorption solution, and the suction member is connected with the transition bin space and used for sucking the carbon dioxide in the transition bin space to the recovery container.

[0010] In the embodiment of the present application, the device further comprises an exhaust device, which comprises a vacuum pump and an exhaust valve arranged on the environment bin body, and the vacuum pump is connected with the exhaust valve to perform exhaust treatment on the environment bin space when the exhaust valve is opened.

[0011] To achieve the above-mentioned purpose, the present application further provides a method for preparing pre-mixed concrete by injecting carbon dioxide, which is applied to the device for preparing pre-mixed concrete by injecting carbon dioxide, and the method comprises:

[0012] opening the inner bin door and introducing carbon dioxide of a preset test concentration into the environment bin space;

[0013] closing the inner bin door and opening the outer bin door, and placing the concrete raw materials in the transition bin space;

[0014] closing the outer bin door and introducing carbon dioxide of a preset test concentration into the transition bin space;

[0015] opening the inner bin door and transferring the concrete raw materials to the environment bin space by the taking device;

[0016] closing the inner bin door and preparing pre-mixed concrete by the stirring mechanism;

[0017] opening the inner bin door and transferring the prepared pre-mixed concrete to the transition bin space by the taking device;

[0018] closing the inner bin door and opening the outer bin door to take out the pre-mixed concrete.

[0019] In the embodiment of the present application, opening the inner bin door and introducing carbon dioxide of a preset test concentration into the environment bin space comprises:

[0020] closing the outer bin door and opening the inner bin door;

[0021] performing exhaust treatment on the environment bin space and the transition bin space by the vacuum pump to reduce the air pressure in the environment bin space and the transition bin space to a first preset pressure.

[0022] The carbon dioxide is introduced into the environment warehouse space, so that the air pressure in the environment warehouse space is recovered from the first preset pressure to the atmospheric pressure;

[0023] In the case that the real-time pressure in the environment warehouse space is less than the atmospheric pressure, the introduction of the carbon dioxide is continued until the real-time pressure is equal to the atmospheric pressure, so that the carbon dioxide concentration in the environment warehouse space reaches the preset test concentration.

[0024] In the embodiment of the present application, the method further comprises, after the outer warehouse door is opened:

[0025] The outer warehouse door is closed;

[0026] The carbon dioxide concentration in the transition warehouse space is detected to obtain a real-time carbon dioxide concentration;

[0027] The carbon dioxide introduction amount is calculated according to the real-time carbon dioxide concentration and the preset test concentration;

[0028] The carbon dioxide is introduced into the transition warehouse space according to the carbon dioxide introduction amount, so that the real-time carbon dioxide concentration in the transition warehouse space is recovered to the preset test concentration.

[0029] In the embodiment of the present application, the closing of the inner warehouse door and the opening of the outer warehouse door to take out the ready-mixed concrete comprises:

[0030] The inner warehouse door is closed and the suction member is controlled to suck the gas in the transition warehouse space to the recovery container for carbon dioxide recovery;

[0031] The outer warehouse door is opened and the ready-mixed concrete is taken out.

[0032] Through the above technical solution, the equipment for preparing ready-mixed concrete by injecting carbon dioxide provided by the embodiment of the present application has the following beneficial effects:

[0033] When the equipment for preparing pre-mixed concrete by injecting carbon dioxide is used, the equipment comprises a transition bin device, an environment bin device and a sampling device, when discharging operation is performed, carbon dioxide with a preset test concentration is first injected into the transition bin space, so that the carbon dioxide concentration in the transition bin space and the environment bin space is the same, and then the transfer of the concrete raw materials is performed, when sampling operation is performed, the pre-mixed concrete is first transferred from the environment bin space to the transition bin space, and then transferred from the transition bin space to the outside, during the whole discharging and sampling process, due to the arrangement of the inner bin door, the transition bin body and the outer bin door, the environment bin space is always in an isolated state from the outside, and the carbon dioxide concentration in the environment bin space is always maintained near the preset value, so that the quality of the pre-mixed concrete is effectively improved, and due to the stability of the preparation environment, the obtained experimental data is also more reliable. In addition, the prepared pre-mixed concrete can be directly injected into a mold in the environment bin body, and after solidification, the pre-mixed concrete is demolded, and at the same time, carbon dioxide curing is performed in the environment bin, so that the compressive strength of the precast concrete member is improved.

[0034] Other features and advantages of the present application will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0035] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of this specification that is made of the description of the application, and are used together with the following detailed description to explain the application, but do not constitute a limitation to the application. In the drawings:

[0036] Figure 1 is a schematic diagram of an equipment for preparing pre-mixed concrete by injecting carbon dioxide according to an embodiment of the present application;

[0037] Figure 2 is a flow chart of a method for preparing pre-mixed concrete by injecting carbon dioxide according to an embodiment of the present application;

[0038] Figure 3 is a relationship curve diagram of carbon dioxide concentration and carbon dioxide absorption rate according to an embodiment of the present application;

[0039] Figure 4 is a relationship diagram of carbon dioxide concentration and precast concrete compressive strength according to an embodiment of the present application;

[0040] Figure 5 is a schematic diagram of injecting carbon dioxide at different stages in five groups of specific embodiments according to the present application;

[0041] Figure 6 is a relationship diagram of injecting carbon dioxide at different stages and compressive strength in five groups of specific embodiments according to the present application;

[0042] Figure 7 is a schematic diagram of an environment bin space according to an embodiment of the present application.

[0043] Explanation of reference numerals in the attached figures

[0044] 1. Carbon dioxide injection device; 11. Storage tank

[0045] 12 Pressure reducing valve 2 Transition chamber device

[0046] 21 Transition compartment 211 Second loading / unloading port

[0047] 22. Outer door 3. Environmental chamber device

[0048] 31 Environmental Container 311 First Loading / Unloading Port

[0049] 32 Inner compartment door 33 Agitator mechanism

[0050] 34 Glass plate 41 Vacuum pump

[0051] 42 Exhaust valve 5 Carbon dioxide recovery device Detailed Implementation

[0052] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0053] The apparatus and method for preparing ready-mixed concrete by injecting carbon dioxide according to the present invention are described below with reference to the accompanying drawings.

[0054] like Figure 1 As shown, the present invention provides a device for preparing ready-mixed concrete by injecting carbon dioxide, the device comprising:

[0055] The carbon dioxide injection device 1 includes a storage tank 11 for storing carbon dioxide and a pressure reducing valve 12 located at the outlet of the storage tank 11.

[0056] The transition chamber device 2 includes a transition chamber body 21 and an outer chamber door 22. The transition chamber body 21 forms a transition chamber space that communicates with the carbon dioxide injection device 1. The outer chamber door 22 is provided on the transition chamber body 21 and is used to open or close the transition chamber space.

[0057] The environmental chamber device 3 includes an environmental chamber body 31, an inner chamber door 32, and a mixing mechanism 33. The environmental chamber body 31 forms an environmental chamber space that communicates with the transition chamber space. The mixing mechanism 33 is located in the environmental chamber space and is used to mix ready-mixed concrete. The inner chamber door 32 is located between the environmental chamber body 31 and the transition chamber 21 and is used to open or close the environmental chamber space.

[0058] The material handling device is used to transfer concrete raw materials in the transition chamber space to the environmental chamber space and to transfer ready-mixed concrete prepared in the environmental chamber space to the transition chamber space when the outer chamber door 22 is closed.

[0059] When the above-mentioned equipment for preparing pre-mixed concrete by injecting carbon dioxide is used, since the equipment comprises the transition bin device 2, the environment bin device 3 and the material taking device, when the discharging operation is performed, the carbon dioxide of a preset test concentration is first injected into the transition bin space, the carbon dioxide concentrations in the transition bin space and the environment bin space are made the same, and then the transfer of the concrete raw materials is performed, when the sampling operation is performed, the pre-mixed concrete is first transferred from the environment bin space to the transition bin space, and then transferred from the transition bin space to the outside, during the whole discharging and sampling process, since the inner bin door 32, the transition bin body 21 and the outer bin door 22 are arranged, the environment bin space is always in the isolated state from the outside, and the carbon dioxide concentration in the environment bin space is always kept around the preset value, so that the quality of the pre-mixed concrete is effectively improved, and since the preparation environment is stable, the obtained experimental data is also more reliable. In addition, the prepared pre-mixed concrete can also be directly injected into a mold in the environment bin space, and after solidification, the mold is demolded and the carbon dioxide curing is performed in the environment bin at the same time, so that the compressive strength of the concrete precast member is improved.

[0060] Specifically, the carbon dioxide injection device 1 can also be connected with the transition bin body 21 and the environment bin body 31 at the same time, so as to separately adjust the carbon dioxide concentration in the transition bin space and the carbon dioxide concentration in the environment bin space.

[0061] It should be noted that the present application provides an equipment for preparing pre-mixed concrete by injecting carbon dioxide, which is especially suitable for the trial production and experiment of the pre-mixed concrete, but can also be applied in actual production.

[0062] In the embodiment of the present application, the environment bin body 31 is formed with a first taking and placing opening 311, and the material taking device comprises a first taking and placing glove, which corresponds to and seals the first taking and placing opening 311 and is arranged on the environment bin body 31. Then through the first taking and placing glove, the operator can transfer the pre-mixed concrete or the concrete raw materials between the environment bin space and the transition bin space, and also can add mixing water and admixtures during the preparation of the pre-mixed concrete, so that the operation is more convenient.

[0063] Specifically, the environment bin body 31 is formed with two spaced first taking and placing openings 311, and two first taking and placing gloves correspond to and seal the two first taking and placing openings 311, so as to facilitate the operator to operate with both hands. Referring to Figure 7 , the concrete raw materials can also be placed in the environment bin space in addition to the stirring mechanism 33, and the operator can configure the pre-mixed concrete as needed through the two first taking and placing gloves. In addition, the material taking device can also be arranged as a mechanical hand in the environment bin space, and the mechanical hand is in communication connection with the control host, so as to control the mechanical hand to perform corresponding operations in the environment bin space.

[0064] In the embodiment of the present application, the observation window is formed above the first taking and placing opening 311 on the environmental bin body 31, and the environmental bin device 3 further comprises a glass plate 34 corresponding to the sealed observation window. The observation window is arranged to facilitate the operator to observe the inside of the environmental bin space, so as to facilitate the operation through the first taking and placing glove. The glass plate 34 is arranged to ensure that the environmental bin space is in a sealed state, so as to build a carbon dioxide environment meeting the preset test concentration. In addition, when the taking device is a mechanical hand, a camera can also be arranged on the environmental bin body 31, the camera is in communication connection with the control host, and the picture taken by the camera can be transmitted to the control host in real time. The operator realizes remote operation through the control host.

[0065] In the embodiment of the present application, the second taking and placing opening 211 is formed on the transition bin body 21, and the taking device further comprises a second taking and placing glove corresponding to the sealed second taking and placing opening 211 and arranged on the transition bin body 21. The arrangement of the second taking and placing opening 211 and the second taking and placing glove facilitates the operator to transfer the concrete raw materials and the premixed concrete. At the same time, the equipment can be operated by two operators at the same time. The two operators use the first taking and placing glove and the second taking and placing glove to cooperate, so as to improve the work efficiency. Specifically, the number of the second taking and placing opening 211 and the second taking and placing glove is also two.

[0066] In the embodiment of the present application, the equipment further comprises a carbon dioxide recovery device 5, the carbon dioxide recovery device 5 comprises a suction member and a recovery container, the recovery container is used for containing a carbon dioxide absorption solution, and the suction member is connected with the transition bin space and is used for sucking the carbon dioxide in the transition bin space to the recovery container. The arrangement of the carbon dioxide recovery device 5 can reduce carbon emissions. Specifically, the carbon dioxide absorption solution can be any one or more of sodium hydroxide solution, calcium hydroxide solution and the like alkaline solution.

[0067] In the embodiment of the present application, the equipment further comprises an exhaust device, the exhaust device comprises a vacuum pump 41 and an exhaust valve 42, the exhaust valve 42 is arranged on the environmental bin body 31, and the vacuum pump 41 is connected with the exhaust valve 42 to perform exhaust treatment on the environmental bin space when the exhaust valve 42 is opened. The vacuum pump 41 exhausts the environmental bin space, and the concentration of carbon dioxide in the environmental bin space is controlled by controlling the amount of air exhausted and the amount of carbon dioxide introduced.

[0068] Specifically, the equipment further comprises a pressure detection sensor for detecting the pressure in the environmental bin space. When the vacuum pump 41 exhausts, the pressure in the environmental bin space decreases, and when the carbon dioxide injection device 1 injects carbon dioxide, the pressure in the environmental bin space rises. Since the initial gas in the environmental bin space is mainly nitrogen and oxygen, the concentration of carbon dioxide can be calculated by calculating the change of the pressure.

[0069] To achieve the above object, the application further provides a method for preparing pre-mixed concrete by injecting carbon dioxide, which is applied to the above-mentioned device for preparing pre-mixed concrete by injecting carbon dioxide and comprises the following steps.

[0070] In step S100, the inner chamber door 32 is opened and carbon dioxide with a preset test concentration is introduced into the environment chamber space.

[0071] The carbon dioxide concentration directly affects the absorption rate of the pre-mixed concrete to carbon dioxide, and further affects the compressive strength of the pre-mixed concrete. Specifically, the preset test concentration is valued between 20% and 100%. In an embodiment of the application, the preset test concentration is respectively 0%, 20%, 60%, 80% and 100%, as shown in Table 1. When the carbon dioxide concentration is 20%, the compressive strength of the pre-mixed concrete is the highest, and therefore, the preset test concentration is preferably 20% in the application. Figure 3 、 Figure 4 When the carbon dioxide concentration is 20%, the compressive strength of the pre-mixed concrete is the highest, and therefore, the preset test concentration is preferably 20% in the application.

[0072] Table 1

[0073] Carbon dioxide concentration Carbon dioxide absorption Compressive strength 0％ / 60 MPa 20％ 0.5％ 64 MPa 60％ 0.94％ 51.3 MPa 80％ 1.5％ 49.6 MPa 100％ 1.6％ 47 MPa

[0074] In step S200, the inner chamber door 32 is closed and the outer chamber door 22 is opened, and the concrete raw materials are placed in the transition chamber space.

[0075] In step S300, the outer chamber door 22 is closed and carbon dioxide with a preset test concentration is introduced into the transition chamber space.

[0076] Step S300 is used to ensure that the carbon dioxide concentrations in the transition chamber space and the environment chamber space are the same. When the inner chamber door 32 is opened, the carbon dioxide concentration in the environment chamber space is still maintained stable, which ensures the quality of the pre-mixed concrete and the accuracy of the experimental data.

[0077] In step S400, the inner chamber door 32 is opened and the concrete raw materials are transferred to the environment chamber space by the material taking device.

[0078] In step S500, the inner chamber door 32 is closed and the pre-mixed concrete is prepared by the stirring mechanism 33.

[0079] Specifically, the preparation of the pre-mixed concrete by the stirring mechanism 33 comprises: stirring and mixing the dry materials in the concrete raw materials, which include cement, gravel and sand; after the dry materials are uniformly mixed, the water for mixing is added by the first taking and placing glove in batches, so that the free water content in the concrete mixture is at a low level, and the carbon dioxide absorption efficiency is improved. Further, the water adding and stirring time is 240 seconds, and the water for mixing is added in four times, of which 25% of the water for mixing is added at the beginning of stirring, and then the remaining water for mixing is added in batches with an interval of 60 seconds each time.

[0080] Step S600, opening the inner bin door 32 and transferring the prepared ready-mixed concrete into the transition bin space through the taking device;

[0081] Step S700, closing the inner bin door 32 and opening the outer bin door 22 to take out the ready-mixed concrete.

[0082] Therefore, through the above steps, the concentration of carbon dioxide in the environment bin space is not affected during the entire preparation process of the ready-mixed concrete, whether it is feeding or taking, which ensures the preparation quality of the ready-mixed concrete and the accuracy of the experimental data. In addition, the entire mixing process is in a carbon dioxide environment, and the carbon dioxide fully contacts and reacts with the concrete raw materials to generate nanoscale calcium carbonate and adhere to the surface of the mineral components. The generated nanoscale calcium carbonate has high stability and can stably exist during the subsequent hardening process. The nanoscale calcium carbonate fills the pores between the cement particles of the ready-mixed concrete, making the structure of the hardened concrete more compact and the microstructure more continuous, which helps to improve the mechanical strength and durability of the concrete structure.

[0083] In an embodiment of the present application, a mold is further arranged in the environment bin space, and step S500 further comprises: in the environment bin space, an operator injects the mixed ready-mixed concrete into the mold through the first taking and placing glove, demolds after solidification, and performs carbon dioxide curing in the environment bin to obtain a concrete building material finished product. The carbon dioxide curing of the concrete building material product further improves the mechanical properties of the finished product and further absorbs carbon dioxide, in line with the concept of green building materials. Specifically, the carbon dioxide curing time is 24 hours, and the test shows that the compressive strength of the finished product is increased by 18%.

[0084] In the embodiment of the present application, step S100: opening the inner bin door 32 and introducing carbon dioxide of a preset test concentration into the environment bin space, specifically comprising:

[0085] Step S110, closing the outer bin door 22 and opening the inner bin door 32;

[0086] Step S120, performing exhaust treatment on the environment bin space and the transition bin space through the vacuum pump 41 to reduce the air pressure in the environment bin space and the transition bin space to a first preset pressure;

[0087] Step S130, introducing carbon dioxide into the environment bin space to restore the air pressure in the environment bin space from the first preset pressure to atmospheric pressure;

[0088] Step S140, in the case that the real-time pressure in the environment bin space is less than atmospheric pressure, continue to introduce carbon dioxide until the real-time pressure is equal to atmospheric pressure, so that the concentration of carbon dioxide in the environment bin space reaches the preset test concentration.

[0089] The above step controls the carbon dioxide concentration in the environment chamber space by controlling the pressure, and the pressure during the preparation of the ready-mixed concrete is maintained at the atmospheric pressure (0.1 MPa), so that the device operates under the normal pressure, which is safer, and the operator can add materials in the environment chamber space through the sealed gloves to adjust the preparation of the ready-mixed concrete as needed under the normal pressure.

[0090] In the embodiment of the present application, the method further comprises, after opening the outer chamber door 22:

[0091] closing the outer chamber door 22;

[0092] detecting the carbon dioxide concentration in the transition chamber space to obtain a real-time carbon dioxide concentration;

[0093] calculating the carbon dioxide input amount according to the real-time carbon dioxide concentration and the preset experimental concentration;

[0094] inputting carbon dioxide into the transition chamber space according to the carbon dioxide input amount, so that the real-time carbon dioxide concentration in the transition chamber space returns to the preset experimental concentration.

[0095] Specifically, steps S200 and S700 both involve opening the outer chamber door 22. Further, a carbon dioxide concentration detector is arranged in the transition chamber space, and a flow meter is arranged at the outlet of the carbon dioxide injection device 1. By controlling the amount of carbon dioxide input, the carbon dioxide concentration in the transition chamber space is kept consistent with that in the environment chamber space, so that even if the inner chamber door 32 is opened in the subsequent operation, the carbon dioxide concentration in the environment chamber space will not change, and the entire process of preparing the ready-mixed concrete is in a stable environment.

[0096] In the embodiment of the present application, step S700: closing the inner chamber door 32 and opening the outer chamber door 22 to take out the ready-mixed concrete comprises:

[0097] closing the inner chamber door 32 and controlling the suction member to suck the gas in the transition chamber space to the recovery container for carbon dioxide recovery;

[0098] opening the outer chamber door 22 and taking out the ready-mixed concrete.

[0099] Through the above steps, the carbon dioxide in the transition chamber space is recovered before the ready-mixed concrete is taken out, thereby reducing the carbon dioxide emission.

[0100] It should be noted that, according to the related standards of the ready-mixed concrete, the production process includes a mixing station mixing stage, a transfer stage and a tank truck transportation stage, and the three stages all involve mixing of the concrete. In the embodiment of the present application, the stage of injecting carbon dioxide is preferably the mixing station mixing stage. Specifically, refer to Figure 4, M1-M5 are five groups of different embodiments, M1 is stirring under normal conditions, M2 is injecting carbon dioxide in the whole process of preparing ready-mixed concrete, M3 is injecting carbon dioxide in the mixing stage of the mixing station, M4 is injecting carbon dioxide in the transportation stage, and M5 is injecting carbon dioxide in the tank truck transportation stage. The compressive strengths of the ready-mixed concrete obtained by injecting carbon dioxide in different stages are shown in Table 1 Figure 5 As shown in Table 1, the compressive strength of M1 at 28 days is 56.5 MPa, M3, M4 and M5 are significantly improved compared with M1, and the compressive strengths are 67.1 MPa, 62.1 MPa and 59.3 MPa, respectively, while the compressive strength of M2 is inversely contracted, which is 51.8 MPa. In summary, injecting carbon dioxide in the appropriate stage can effectively improve the compressive strength of ready-mixed concrete, and injecting carbon dioxide in the mixing stage of the mixing station has the greatest performance improvement effect.

[0101] In the description of the present application, it should be understood that the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0102] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0103] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0104] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that changes, modifications, substitutions and variations can be made by those skilled in the art without departing from the scope of the present application.

Claims

1. A device for preparing ready-mixed concrete by injecting carbon dioxide, characterized in that, The device includes: Carbon dioxide injection device (1); The transition chamber device (2) includes a transition chamber body (21) and an outer chamber door (22). The transition chamber body (21) forms a transition chamber space that communicates with the carbon dioxide injection device (1). The outer chamber door (22) is provided on the transition chamber body (21) and is used to open or close the transition chamber space. An environmental chamber device (3) includes an environmental chamber body (31), an inner chamber door (32), and a mixing mechanism (33). The environmental chamber body (31) forms an environmental chamber space that communicates with the transition chamber space. The mixing mechanism (33) is located in the environmental chamber space and is used for mixing ready-mixed concrete. The inner chamber door (32) is located between the environmental chamber body (31) and the transition chamber body (21) and is used to open or close the environmental chamber space. The material handling device is used to transfer concrete raw materials in the transition chamber space to the environmental chamber space when the outer chamber door (22) is closed, and to transfer ready-mixed concrete prepared in the environmental chamber space to the transition chamber space.

2. The equipment for preparing ready-mixed concrete by injecting carbon dioxide according to claim 1, characterized in that, The environmental chamber (31) has a first pick-up and drop-off port (311) formed on it. The pick-up device includes a first pick-up and drop-off glove, which is correspondingly sealed to the first pick-up and drop-off port (311) and is disposed on the environmental chamber (31).

3. The equipment for preparing ready-mixed concrete by injecting carbon dioxide according to claim 2, characterized in that, An observation window is also formed on the environmental chamber (31) above the first loading and unloading port (311). The environmental chamber device (3) also includes a glass plate (34), which seals the observation window.

4. The equipment for preparing ready-mixed concrete by injecting carbon dioxide according to claim 1, characterized in that, The transition chamber (21) has a second pick-up and drop-off port (211) formed on it. The pick-up device also includes a second pick-up and drop-off glove, which is correspondingly sealed to the second pick-up and drop-off port (211) and is disposed on the transition chamber (21).

5. The apparatus for preparing ready-mixed concrete by injecting carbon dioxide according to any one of claims 1 to 4, characterized in that, The device also includes a carbon dioxide recovery device (5), which includes a suction component and a recovery container. The recovery container is used to hold a carbon dioxide absorption solution. The suction component is connected to the transition chamber space and is used to suction the carbon dioxide in the transition chamber space to the recovery container.

6. The apparatus for preparing ready-mixed concrete by injecting carbon dioxide according to any one of claims 1 to 4, characterized in that, The device also includes an exhaust device, which includes a vacuum pump (41) and an exhaust valve (42). The exhaust valve (42) is located on the environmental chamber (31). The vacuum pump (41) is connected to the exhaust valve (42) for exhausting the environmental chamber space when the exhaust valve (42) is opened.

7. A method for preparing ready-mixed concrete by injecting carbon dioxide, characterized in that, The method, applied to the apparatus for preparing ready-mixed concrete by injecting carbon dioxide according to any one of claims 1 to 6, comprises: Open the inner chamber door (32) and introduce carbon dioxide of the preset test concentration into the environmental chamber space; Close the inner chamber door (32) and open the outer chamber door (22) to place the concrete raw materials in the transition chamber space; Close the outer compartment door (22) and introduce carbon dioxide at a preset test concentration into the transition compartment space; Open the inner warehouse door (32) and transfer the concrete raw materials into the environmental warehouse space using the material handling device; Close the inner silo door (32) and prepare ready-mixed concrete using the mixing mechanism (33); Open the inner silo door (32) and transfer the prepared ready-mixed concrete to the transition silo space through the material handling device; Close the inner compartment door (32) and open the outer compartment door (22) to remove the pre-mixed concrete.

8. The method for preparing ready-mixed concrete by injecting carbon dioxide according to claim 7, characterized in that, The step of opening the inner chamber door (32) and introducing carbon dioxide of a preset test concentration into the environmental chamber space includes: Close the outer compartment door (22) and open the inner compartment door (32); The air pressure in the environmental chamber and the transition chamber is reduced to the first preset pressure by exhausting the air in the environmental chamber and the transition chamber by vacuum pump (41). Carbon dioxide is introduced into the environmental chamber to restore the air pressure inside the environmental chamber from the first preset pressure to atmospheric pressure; When the real-time pressure inside the environmental chamber is lower than the atmospheric pressure, carbon dioxide is continuously introduced until the real-time pressure equals the atmospheric pressure, so that the carbon dioxide concentration inside the environmental chamber reaches the preset test concentration.

9. The method for preparing ready-mixed concrete by injecting carbon dioxide according to claim 7, characterized in that, The method further includes, after opening the outer compartment door (22): Close the outer warehouse door (22); The carbon dioxide concentration in the transition chamber space is detected to obtain the real-time carbon dioxide concentration; The carbon dioxide injection rate is calculated based on the real-time carbon dioxide concentration and the preset experimental concentration. Carbon dioxide is introduced into the transition chamber space according to the carbon dioxide injection rate, so that the real-time carbon dioxide concentration in the transition chamber space is restored to the preset experimental concentration.

10. The method for preparing ready-mixed concrete by injecting carbon dioxide according to claim 7, characterized in that, The process of closing the inner silo door (32) and opening the outer silo door (22) to remove the ready-mixed concrete includes: Close the inner chamber door (32) and control the suction unit to draw the gas in the transition chamber space to the recovery container for carbon dioxide recovery; Open the outer compartment door (22) and take out the pre-mixed concrete.

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