Graphene mixing device and mixing method for composite cement for cementing

Abstract

This invention belongs to the field of cement preparation technology, specifically disclosing a graphene mixing device and method for composite cement used in well cementing. The mixing device includes: a mixing cylinder for holding a mixture of graphene powder and composite cement; a material guiding mechanism disposed at the center of the mixing cylinder for upward conveying of the mixture, the material guiding mechanism having a lower material guiding inlet and an upper material guiding outlet; and an ultrasonic mixing channel disposed between the mixing cylinder and the material guiding mechanism, the ultrasonic mixing channel having an upper inlet and a lower outlet, the inlet being fluidly connected to the outlet of the material guiding mechanism, and the outlet being fluidly connected to the inlet of the material guiding mechanism. An ultrasonic transducer is disposed in the ultrasonic mixing channel for ultrasonically vibrating the mixture. The mixing device and method provided by this invention can achieve uniform mixing of graphene powder and composite cement, which helps to improve the performance and quality of the composite material.

Description

Technical Field

[0001] This invention belongs to the field of cement preparation technology, specifically relating to a graphene mixing device for composite cement used in well cementing and a graphene mixing method for composite cement used in well cementing. Background Technology

[0002] Cement, also known as concrete, is a building material and an essential component of construction. Graphene, a carbon nanomaterial with excellent thermal conductivity, electrical conductivity, and mechanical strength, can be used to enhance cement performance. Incorporating graphene into composite cement creates a novel cement material aimed at improving cement's properties. However, during composite cement preparation, due to the poor flowability of cement, graphene powder often agglomerates, forming clumps that are difficult to disperse evenly within the cement.

[0003] Therefore, it is necessary to provide a method and apparatus for mixing graphene in composite cement for well cementing to solve the problems mentioned in the background art. Summary of the Invention

[0004] The purpose of this invention is to provide a graphene mixing device and mixing method for cementing composite cement that can uniformly disperse graphene powder in a composite cement matrix.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: According to a first aspect of the present invention, a graphene mixing device for composite cement used in well cementing is provided, comprising: A mixing drum used to hold a mixture of graphene powder and composite cement. A material guiding mechanism, located at the center of the mixing cylinder for upward conveying of the mixture, has a lower material inlet and an upper material outlet; and An ultrasonic mixing channel is disposed between the mixing cylinder and the material guiding mechanism. The ultrasonic mixing channel has an upper inlet and a lower outlet. The inlet is in fluid communication with the material guiding outlet of the material guiding mechanism, and the outlet is in fluid communication with the material guiding inlet of the material guiding mechanism. An ultrasonic transducer for ultrasonically vibrating the mixture is disposed in the ultrasonic mixing channel.

[0006] According to one embodiment of the present invention, the mixing device further includes a shock-absorbing base, on which the mixing cylinder is supported.

[0007] According to one embodiment of the present invention, the material guiding mechanism includes: A central tube is coaxially fixed inside the mixing cylinder, with openings at both the top and bottom ends of the central tube forming the material inlet and the material outlet; A rotatable spiral guide shaft is installed inside the central tube; and A drive mechanism connected to the spiral guide shaft for driving the spiral guide shaft to rotate.

[0008] According to one embodiment of the present invention, a stirring blade is fixed at the lower end of the spiral guide shaft.

[0009] According to one embodiment of the present invention, the mixing device further includes a cover that cooperates with the mixing cylinder, and the driving mechanism is disposed on the cover.

[0010] According to one embodiment of the present invention, the ultrasonic mixing channel includes: an outer ring pipe with a circular cross-section, including an inner ring wall, an outer ring wall, and a flow channel formed between the inner ring wall and the outer ring wall, the inner ring wall being fixed to the material guiding mechanism, the outer ring wall being fixed to the mixing cylinder, the upper and lower ends of the outer ring pipe being open to form the inlet and the outlet, and the ultrasonic transducer being disposed in the flow channel.

[0011] According to one embodiment of the present invention, the outer ring pipe has a plurality of vertically arranged flow channels distributed circumferentially, each flow channel having an ultrasonic mixing chamber, and the ultrasonic transducer being disposed in the ultrasonic mixing chamber.

[0012] According to one embodiment of the present invention, each flow channel is provided with multiple ultrasonic mixing chambers arranged vertically.

[0013] According to one embodiment of the present invention, a mixing ring cavity is provided between vertically adjacent ultrasonic mixing cavities, and a plurality of stirring shafts are provided in the mixing ring cavity, with a mixing blade fixed on each stirring shaft.

[0014] According to one embodiment of the present invention, a blocking ring pipe is provided between the inner ring wall of the outer ring pipe and the material guiding mechanism. The blocking ring pipe is fixed to the central pipe of the material guiding mechanism. A plurality of openings are provided on the inner ring wall at the position corresponding to the mixing ring cavity. One end of the plurality of stirring shafts is fixed on the blocking ring pipe, and the other end extends into the mixing ring cavity through the plurality of openings.

[0015] According to one embodiment of the present invention, sealing rubber rings are symmetrically fitted on the blocking ring tube at positions corresponding to the mixing ring cavity.

[0016] According to one embodiment of the present invention, the cross-section of the mixing blade is Z-shaped.

[0017] According to one embodiment of the present invention, the ultrasonic mixing cavity includes: An external pipe is installed in the flow channel; The main pipe is installed in the external pipeline; A first elastic element is disposed between the outer pipe and the main pipe. The outer pipe has multiple first ultrasonic transducers distributed circumferentially on its sidewall, and the vibration output end of the first ultrasonic transducer is connected to the main pipe.

[0018] According to one embodiment of the present invention, the ultrasonic mixing cavity further includes: The lower guide seat is located below the external pipe; The central shaft is fixed on the lower guide seat; A vibrating tube fitted onto the outside of the central shaft; A second elastic element is disposed between the vibrating tube and the central shaft. A second ultrasonic transducer is provided between the vibrating tube and the central shaft.

[0019] According to one embodiment of the present invention, the ultrasonic mixing cavity further includes: An upper guide seat and a lower guide seat are symmetrically arranged above and below the outer pipe; Sealing sleeves are installed between the upper guide seat and the main guide tube, and between the lower guide seat and the main guide tube.

[0020] According to a second aspect of the present invention, a method for mixing graphene in composite cement for well cementing is provided, characterized in that the composite cement raw materials and graphene powder are mixed using the mixing apparatus described in the first aspect of the present invention, the mixing method comprising the following steps: Prepare the required quantities of composite cement raw materials and graphene powder; The composite cement raw material and the graphene powder are conveyed into the mixing cylinder; The composite cement raw material and the graphene powder are mixed through the feeding mechanism and the ultrasonic mixing channel.

[0021] According to one embodiment of the present invention, the mixing method further includes: During the mixing process, the uniformity of the mixture of graphene powder and composite cement raw materials is observed and detected, and the ultrasonic power, mixing time or stirring speed parameters are adjusted based on the uniformity results.

[0022] According to one embodiment of the present invention, the mixing method further includes: During the mixing process, each of the first ultrasonic transducers distributed circumferentially in each ultrasonic mixing chamber is activated in sequence so that the main tube body can generate an eccentric displacement relative to the outer tube.

[0023] According to one embodiment of the present invention, the mixing method further includes: During the mixing process, each second ultrasonic transducer distributed circumferentially in each ultrasonic mixing chamber is activated sequentially so that the vibrating tube body can generate an eccentric displacement relative to the central axis.

[0024] According to one embodiment of the present invention, the mixing method further includes: By controlling the amplitude and energy density of the first and second ultrasonic transducers, their vibration responses are alternating.

[0025] By adopting the above technical solution, the present invention has at least the following beneficial effects: The graphene mixing device for composite cement used in cementing provided by this invention, by setting a material guiding mechanism, can convey the mixture of graphene powder and composite cement upward, forming a continuous internal flow mixing, which increases the fluidity of the composite cement; by setting an ultrasonic mixing channel, the graphene powder can be effectively dispersed and uniformly dispersed in the composite cement matrix, reducing the aggregation and agglomeration of graphene, thereby improving the uniformity of mixing.

[0026] The graphene mixing device and mixing method for composite cement used in cementing provided by this invention can achieve uniform mixing of graphene powder and composite cement, which helps to improve the performance and quality of composite materials. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of the graphene mixing device for composite cement used in cementing provided by the present invention; Figure 2 A schematic diagram of the material guiding mechanism of the composite cement graphene mixing device for cementing provided by the present invention; Figure 3 for Figure 1 A schematic diagram of a portion of a graphene mixing device for composite cement used in well cementing is shown. Figure 4 A schematic diagram of the ultrasonic mixing chamber of the composite cement graphene mixing device for cementing provided by the present invention; Figure 5 A cross-sectional view of the ultrasonic mixing chamber of the graphene mixing device for composite cement used in cementing provided by the present invention; Figure 6This is a schematic diagram of the mixing flow of the composite cement mixture in the ultrasonic mixing chamber in this invention; Figure 7 This is a schematic diagram of the working state of the ultrasonic mixing cavity in this invention.

[0029] Explanation of reference numerals in the attached figures 1. Mixing cylinder; 11. Vibration damping base; 12. Feeding pipe; 13. Cylinder cover; 2. Material guiding mechanism; 21. Central tube; 22. Spiral guide shaft; 23. Drive mechanism; 24. Stirring blade; 25. Material guide inlet; 26. Material guide outlet; 3. Ultrasonic mixing channel; 31. Outer ring pipe; 32. Mixing ring cavity; 33. Barrier ring pipe; 34. Support rod; 35. Sealing rubber ring; 36. Stirring shaft; 37. Feed inlet; 38. Discharge outlet; 4. Ultrasonic mixing chamber; 41. Outer pipe; 42. Main guide pipe; 43. Upper guide seat; 44. First elastic element; 45. Sealing sleeve; 46. Central shaft; 47. Vibrating tube; 48. Lower guide seat; 5. First ultrasonic transducer; 6. Second ultrasonic transducer. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the contents described in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size should fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0032] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. The terms “first,” “second,” and “third” are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term “or” is generally used to include the meaning of “and / or” unless the content expressly indicates otherwise.

[0033] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. The terms "bottom," "top," "upper part," "lower part," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0034] A first aspect of the present invention provides a graphene mixing device for composite cement used in well cementing. For example... Figure 1 As shown, the mixing device includes: a mixing cylinder 1 for holding a mixture of graphene powder and composite cement; a material guiding mechanism 2 disposed at the center of the mixing cylinder 1 for conveying the mixture upward, the material guiding mechanism 2 having a material guiding inlet 25 located at the bottom and a material guiding outlet 26 located at the top; and an ultrasonic mixing channel 3 disposed between the mixing cylinder 1 and the material guiding mechanism 2, the ultrasonic mixing channel 3 having an inlet 37 located at the top and an outlet 38 located at the bottom, the inlet 37 being in fluid communication with the material guiding outlet 26 of the material guiding mechanism 2, the outlet 38 being in fluid communication with the material guiding inlet 25 of the material guiding mechanism 2, and an ultrasonic transducer for ultrasonically vibrating the mixture being disposed in the ultrasonic mixing channel 3.

[0035] The graphene mixing device for composite cement used in cementing provided by this invention, through the setting of a material guiding mechanism 2, can convey the mixture of graphene powder and composite cement upwards, forming a continuous internal flow mixing and increasing the fluidity of the composite cement. Through the setting of an ultrasonic mixing channel 3, the graphene powder can be effectively dispersed, uniformly dispersed in the composite cement matrix, reducing graphene aggregation and agglomeration, thereby improving the uniformity of mixing. Compared with traditional mechanical stirring, ultrasonic mixing exerts less shear force on graphene particles, reducing the risk of damage to the graphene structure and helping to maintain the original properties of graphene. It also completes the mixing process faster, improving production efficiency, which is a significant advantage for large-scale production of composite cement materials.

[0036] In some embodiments, the mixing device further includes a shock-absorbing base 11, on which the mixing cylinder 1 is supported. The mixing cylinder 1 can be mounted on the ground via the shock-absorbing base 11 to reduce the interference of vibration on the surrounding environment and ensure the stability and safety of the mixing device.

[0037] In some embodiments, the upper end of the mixing cylinder 1 is vertically connected to a feeding pipe 12, which is used to transport precisely metered graphene powder into the mixing cylinder 1.

[0038] In some embodiments, the mixing apparatus further includes a cover 13 that mates with the mixing cylinder 1 to prevent leakage of the mixture. The feed pipe 12 may be mounted on the cover 13.

[0039] In some embodiments, such as Figure 2 As shown, the material guiding mechanism 2 includes: a central tube 21 coaxially fixed inside the mixing cylinder 1, with openings at both ends of the central tube 21 forming a material guiding inlet 25 and a material guiding outlet 26; a spiral material guiding shaft 22 rotatably disposed inside the central tube 21; and a drive mechanism 23 connected to the spiral material guiding shaft 22 for driving the spiral material guiding shaft 22 to rotate. In use, the drive mechanism 23 drives the spiral material guiding shaft 22 to rotate continuously (e.g., counterclockwise), thereby transporting the mixture at the bottom of the mixing cylinder 1 upwards. The mixture enters from the upper part of the ultrasonic mixing channel 3 and exits from the lower part to achieve a circulating mixing effect.

[0040] In the illustrated embodiment, the drive mechanism 23 is fixed above the mixing cylinder 1, specifically, fixed to the cylinder cover 13. The drive mechanism 23 may be, for example, a drive motor, the output end of which is connected to one end of the spiral guide shaft 22. The spiral guide shaft 22 includes a guide shaft and spiral conveying blades fixedly sleeved on the outside of the guide shaft. In use, the drive motor drives the guide shaft to rotate, which in turn drives the spiral conveying blades to rotate, so that the mixture entering the guiding mechanism 2 through the guide inlet 25 is conveyed upward in the central tube 21 by the spiral conveying blades and then discharged from the guide outlet 26.

[0041] In some embodiments, the lower end of the spiral guide shaft 22 is also fixed with a stirring blade 24 for stirring and mixing the mixture at the bottom of the mixing cylinder 1.

[0042] In some embodiments, such as Figure 1 and Figure 3 As shown, the ultrasonic mixing channel 3 includes an outer ring pipe 31 with a circular cross-section, including an inner ring wall, an outer ring wall, and a flow channel formed between the inner ring wall and the outer ring wall. The inner ring wall is fixed to the material guiding mechanism 2 (specifically, the central tube 21 of the material guiding mechanism 2), and the outer ring wall is fixed to the mixing cylinder 1. The upper and lower ends of the outer ring pipe 31 are open to form an inlet 37 and an outlet 38. The ultrasonic transducer is installed in the flow channel.

[0043] In some embodiments, the outer ring pipe 31 has a plurality of vertically arranged flow channels distributed circumferentially, and each flow channel is provided with an ultrasonic mixing chamber 4, thereby providing a plurality of ultrasonic mixing chambers 4, which can provide continuous ultrasonic vibration.

[0044] In some embodiments, multiple ultrasonic mixing chambers 4 are arranged vertically in each flow channel. In the illustrated embodiment, three ultrasonic mixing chambers 4 are arranged vertically in each flow channel. This arrangement facilitates multi-stage ultrasonic vibration of the mixture, contributing to better dispersion of the graphene powder.

[0045] In some embodiments, when multiple ultrasonic mixing chambers 4 are arranged vertically in each flow channel, a mixing ring chamber 32 is arranged between vertically adjacent ultrasonic mixing chambers 4. Multiple stirring shafts 36 are arranged in the mixing ring chamber 32, and each stirring shaft 36 is fixed with a mixing blade, which helps to re-aggregate and stir the mixture. The stirred and aggregated mixture enters the ultrasonic mixing chamber 4 below.

[0046] In some embodiments, a blocking pipe 33 is provided between the inner ring wall of the outer ring pipe 31 and the material guiding mechanism 2. The blocking pipe 33 is fixed to the central pipe 21 of the material guiding mechanism 2. Multiple openings are provided on the inner ring wall corresponding to the position of the mixing ring cavity 32. One end of multiple stirring shafts 36 is fixed to the blocking pipe 33, and the other end extends into the mixing ring cavity 32 through the multiple openings. In use, the blocking pipe 33 rotates synchronously with the spiral material guiding shaft 22. The mixing ring cavity 32 can re-aggregate and mix the mixture in the ultrasonic mixing cavity 4 at the same height, thereby improving the uniformity of composite cement mixing.

[0047] In some embodiments, the retaining ring tube 33 is fixed to the spiral guide shaft 22 in the guide mechanism 2 by a symmetrically fixed support rod 34.

[0048] In some embodiments, sealing rubber rings 35 are symmetrically fitted on the blocking ring tube 33 at positions corresponding to the mixing ring cavity 32 to prevent the composite cement from escaping.

[0049] In some embodiments, the retaining ring tube 33 has a plurality of stirring shafts 36 distributed circumferentially, and mixing blades are fixed on the stirring shafts 36. The cross-section of the mixing blades is Z-shaped so as to re-aggregate and stir the composite cement, and then disperse it and enter the next ultrasonic mixing chamber in sequence.

[0050] In some embodiments, such as Figure 4 and Figure 5 As shown, the ultrasonic mixing chamber 4 includes: an outer pipe 41 disposed in a flow channel; a main pipe 42 disposed in the outer pipe 41; and a first elastic member 44 disposed between the outer pipe 41 and the main pipe 42. A plurality of first ultrasonic transducers 5 are circumferentially distributed on the sidewall of the outer pipe 41, and the vibration output end of the first ultrasonic transducer 5 is connected to the main pipe 42. The first ultrasonic transducers 5 can provide radial ultrasonic vibration to the main pipe 42, thereby mixing the composite cement under synchronous vibration of the main pipe 42.

[0051] In some embodiments, the ultrasonic mixing chamber 4 further includes: an upper guide seat 43 and a lower guide seat 48 symmetrically arranged above and below the outer pipe 41; and a sealing sleeve 45 disposed between the upper guide seat 43 and the main guide pipe 42 and between the lower guide seat 43 and the main guide pipe 42.

[0052] In some embodiments, such as Figure 5 As shown, the ultrasonic mixing chamber 4 further includes: a lower guide seat 48 disposed below the outer pipe 41; a central shaft 46 fixed on the lower guide seat 48; a vibrating tube 47 sleeved on the outside of the central shaft 46; and a second elastic element disposed between the vibrating tube 47 and the central shaft 46. A second ultrasonic transducer 6 is disposed between the vibrating tube 47 and the central shaft 46. The second ultrasonic transducer 6 can provide radial ultrasonic vibration to the vibrating tube 47, thereby mixing the composite cement under synchronous vibration of the vibrating tube body. In these embodiments, the first ultrasonic transducer 5 can provide first ultrasonic vibration, and the second ultrasonic transducer 6 can provide second ultrasonic vibration, which can enhance the ultrasonic vibration effect.

[0053] A second aspect of the present invention provides a method for mixing graphene in composite cement for cementing, which uses the above-mentioned mixing device to mix composite cement and graphene powder. The mixing method includes the following steps: preparing a rated amount of composite cement raw material and graphene powder; conveying the composite cement raw material and graphene powder into a mixing cylinder 1; and mixing the composite cement raw material and graphene powder through a material guiding mechanism 2 and an ultrasonic mixing channel 3.

[0054] In some embodiments, the mixing method includes the following steps: S1. Preparation stage: Prepare a fixed amount of composite cement raw materials and graphene powder to ensure that both are of qualified quality and meet the mixing ratio process requirements; S2. Feeding and introducing: The composite cement raw material is smoothly fed into the bottom of the mixing cylinder 1 through the conveying device, and the precisely metered graphene powder is conveyed into the mixing cylinder 1 through the feeding pipe 12 to ensure that the composite cement raw material and graphene powder enter the mixing environment at the same time. S3. In the mixing stage, graphene powder and composite cement raw materials are deposited at the bottom of the mixing cylinder 1. The material guiding mechanism 2 in the mixing cylinder 1 is used to guide them upward to form a continuous internal flow mixing. When the mixture of graphene powder and composite cement raw materials reaches the top of the mixing cylinder 1, the mixture of graphene powder and composite cement can diffuse and enter the ultrasonic mixing channel 3. S4. Ultrasonic mixing stage: The ultrasonic vibration system is activated, and the ultrasonic vibration energy acts on the mixture in the ultrasonic mixing channel 3, causing the graphene powder to be subjected to high-frequency oscillation in the composite cement matrix, thereby uniformly dispersing and penetrating between the composite cement particles. The two achieve uniform mixing through microscopic shearing and diffusion.

[0055] The mixture of graphene powder and composite cement raw materials is mixed after multiple top and bottom material conveying processes. Through continuous feeding of composite cement, precise addition of graphene powder, internal material circulation, and efficient dispersion by ultrasonic mixing channels, uniform mixing of graphene powder and composite cement can be achieved, thereby improving the performance and quality of the composite material.

[0056] In some embodiments, the mixing method further includes: observing and detecting the uniformity of the mixture of graphene powder and composite cement raw materials during the mixing process, and adjusting the ultrasonic power, mixing time or stirring speed parameters based on the uniformity results in order to achieve the desired mixing effect.

[0057] In some embodiments, during the mixing process, each of the first ultrasonic transducers 5 distributed circumferentially in each ultrasonic mixing chamber 4 is activated in sequence so that the main body of the main pipe 42 can generate an eccentric displacement relative to the outer pipe 41, which helps to achieve a more thorough mixing of graphene powder and cement.

[0058] In some embodiments, during the mixing process, each of the second ultrasonic transducers 6 distributed circumferentially in each ultrasonic mixing chamber 4 is activated in sequence so that the main body of the vibrating tube 47 can generate an eccentric displacement relative to the central shaft 46, which helps to achieve a more thorough mixing of graphene powder and cement.

[0059] In some embodiments, the circumferentially distributed first ultrasonic transducers 5 are arranged sequentially in a forward direction to respond to vibration, that is, the first ultrasonic transducers 5 respond to vibration sequentially in a clockwise direction. In this case, the main body of the guiding tube can generate an eccentric displacement relative to the outer tube, forming a circumferential conversion. The circumferentially distributed second ultrasonic transducers 6 are arranged sequentially in a reverse direction to respond to vibration, that is, the second ultrasonic transducers 6 respond to vibration sequentially in a counterclockwise direction. In this case, the vibrating tube 47 body can generate an eccentric displacement relative to the central shaft 46, forming a circumferential conversion. At this time, as... Figure 6 and Figure 7 As shown, the vibrating tube 47 and the main tube 42 form a compression vibration mixing of composite cement. The composite cement in the outer ring can generate clockwise flow during the vibration of the main tube 42, while the composite cement in the inner ring can generate counterclockwise flow during the vibration of the vibrating tube 47, forming a compression convergence, thereby achieving micro-level operation and making the graphene powder and cement more thoroughly mixed.

[0060] In some embodiments, the amplitude and energy density of the first ultrasonic transducer 5 and the second ultrasonic transducer 6 can be controlled to create an alternating vibration response, thereby achieving a stronger or gentler mixing.

[0061] The above are exemplary embodiments disclosed in this invention. The order of the above embodiments is merely for description and does not represent the superiority or inferiority of the embodiments. However, it should be noted that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the disclosed embodiments of this invention (including the claims) is limited to these examples. Various changes and modifications can be made without departing from the scope defined by the claims. Furthermore, although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.

[0062] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of the different aspects of the invention as described above exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A graphene mixing device for composite cement used in well cementing, characterized in that, include: A mixing drum used to hold a mixture of graphene powder and composite cement. A material guiding mechanism is disposed at the center of the mixing cylinder for conveying the mixture upward, the material guiding mechanism having a material guiding inlet located at the bottom and a material guiding outlet located at the top; as well as An ultrasonic mixing channel is disposed between the mixing cylinder and the material guiding mechanism. The ultrasonic mixing channel has an upper inlet and a lower outlet. The inlet is in fluid communication with the material guiding outlet of the material guiding mechanism, and the outlet is in fluid communication with the material guiding inlet of the material guiding mechanism. An ultrasonic transducer for ultrasonically vibrating the mixture is disposed in the ultrasonic mixing channel. The ultrasonic mixing channel includes an outer ring pipe with a circular cross-section, comprising an inner ring wall, an outer ring wall, and a flow channel formed between the inner and outer ring walls. The inner ring wall is fixed to the material guiding mechanism, and the outer ring wall is fixed to the mixing cylinder. The outer ring pipe has openings at its upper and lower ends to form the inlet and outlet. The outer ring pipe has multiple vertically arranged flow channels distributed circumferentially, and each flow channel is provided with an ultrasonic mixing chamber. The ultrasonic mixing cavity includes: An external pipe is installed in the flow channel; The main pipe is installed in the external pipeline; A first elastic element is disposed between the outer pipe and the main pipe. The lower guide seat is located below the external pipe; The central shaft is fixed on the lower guide seat; A vibrating tube fitted onto the outside of the central shaft; A second elastic element is disposed between the vibrating tube and the central shaft. The outer pipe has multiple first ultrasonic transducers distributed circumferentially on its sidewall. The vibration output end of the first ultrasonic transducer is connected to the main tube. A second ultrasonic transducer is provided between the vibrating tube and the central shaft.

2. The graphene mixing device for composite cement used in cementing according to claim 1, characterized in that, The mixing device also includes a shock-absorbing base, on which the mixing cylinder is supported.

3. The graphene mixing device for composite cement used in cementing according to claim 1, characterized in that, The material guiding mechanism includes: A central tube is coaxially fixed inside the mixing cylinder, with openings at both the top and bottom ends of the central tube forming the material inlet and the material outlet; A rotatable spiral guide shaft is installed inside the central tube; and A drive mechanism connected to the spiral guide shaft for driving the spiral guide shaft to rotate.

4. The graphene mixing device for composite cement used in cementing according to claim 3, characterized in that, A stirring blade is fixed at the lower end of the spiral guide shaft.

5. The graphene mixing device for composite cement used in cementing according to claim 3, characterized in that, The mixing device also includes a cover that works in conjunction with the mixing cylinder, and the drive mechanism is disposed on the cover.

6. The graphene mixing device for composite cement used in cementing according to claim 3, characterized in that, Each flow channel contains multiple ultrasonic mixing chambers arranged vertically.

7. The graphene mixing device for composite cement used in cementing according to claim 6, characterized in that, A mixing ring cavity is provided between vertically adjacent ultrasonic mixing cavities, and multiple stirring shafts are provided in the mixing ring cavity, with mixing blades fixed on each stirring shaft.

8. The graphene mixing device for composite cement used in cementing according to claim 7, characterized in that, A blocking ring pipe is provided between the inner ring wall of the outer ring pipe and the material guiding mechanism. The blocking ring pipe is fixed to the central pipe of the material guiding mechanism. Multiple openings are provided on the inner ring wall at positions corresponding to the mixing ring cavity. One end of the multiple stirring shafts is fixed on the blocking ring pipe, and the other end extends into the mixing ring cavity through the multiple openings.

9. The graphene mixing device for composite cement used in cementing according to claim 8, characterized in that, The sealing rubber rings are symmetrically fitted on the upper and lower parts of the blocking ring tube at the positions corresponding to the mixing ring cavity.

10. The graphene mixing device for composite cement used in cementing according to claim 7, characterized in that, The cross-section of the mixing blade is Z-shaped.

11. The graphene mixing device for composite cement used in cementing according to claim 1, characterized in that, The ultrasonic mixing chamber also includes: An upper guide seat is symmetrically arranged with respect to the lower guide seat; Sealing sleeves are installed between the upper guide seat and the main guide tube, and between the lower guide seat and the main guide tube.

12. A method for mixing graphene in composite cement for well cementing, characterized in that, The method of mixing composite cement raw materials and graphene powder using the mixing apparatus according to any one of claims 1-11 includes the following steps: Prepare the required quantities of composite cement raw materials and graphene powder; The composite cement raw material and the graphene powder are conveyed into the mixing cylinder; The composite cement raw material and the graphene powder are mixed through the feeding mechanism and the ultrasonic mixing channel; During the mixing process, each of the first ultrasonic transducers distributed circumferentially in each ultrasonic mixing chamber is activated in sequence so that the main tube body can generate an eccentric displacement relative to the outer tube. During the mixing process, each second ultrasonic transducer distributed circumferentially in each ultrasonic mixing chamber is activated sequentially so that the vibrating tube body can generate an eccentric displacement relative to the central axis.

13. The method for mixing graphene in composite cement for cementing according to claim 12, characterized in that, The method further includes: During the mixing process, the uniformity of the mixture of graphene powder and composite cement raw materials is observed and detected, and the ultrasonic power, mixing time or stirring speed parameters are adjusted based on the uniformity results.

14. The method for mixing graphene in composite cement for cementing according to claim 12, characterized in that, The method further includes: By controlling the amplitude and energy density of the first and second ultrasonic transducers, their vibration responses are alternating.

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