Superfine powder mixing device with self-cleaning function

Abstract

The utility model relates to the technical field of oil and gas well fracturing, and discloses a superfine powder mixing device with a self-cleaning function. The superfine powder mixing device comprises a discharging assembly, a mixing pipe, a backflow pipe, a spiral stirring assembly and an ultrasonic generator, a vertically-extending discharging channel is formed in the discharging assembly, a meter is arranged on the discharging assembly, and the meter is configured to meter the amount of superfine powder passing through the discharging channel; the mixing pipe is communicated with the lower end of the discharging channel, the solvent can enter the mixing pipe from the first end of the mixing pipe and flow out from the second end of the mixing pipe, and a liquid outlet valve is arranged at the second end of the mixing pipe; one end of the return pipe is communicated with the mixing pipe, and the other end is communicated with the blanking channel; the spiral stirring assembly is arranged in an inner cavity of the mixing pipe; the ultrasonic generator is used for emitting ultrasonic waves to the superfine powder passing through the spiral stirring assembly. According to the superfine powder mixing device, the swelling and dissolving effects of superfine powder are guaranteed, and meanwhile automatic cleaning of the superfine powder mixing device is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of oil and gas well fracturing technology, and in particular relates to an ultrafine powder mixing device with self-cleaning function. Background Technology

[0002] In the fracturing process of oil and gas wells, fracturing fluid is often used to transfer the high pressure generated by surface equipment to the formation, causing the formation to fracture and transport proppant along the fractures to increase the production of oil and gas wells. Existing fracturing fluids are mainly divided into oil-based fracturing fluids and water-based fracturing fluids. Compared to oil-based fracturing fluids, which are emulsions composed of oil and additives, water-based fracturing fluids, which are mixtures of water and powders, can be mixed on-site due to the characteristics of the powders, and the formula and concentration can be flexibly adjusted according to the actual site conditions and fracturing requirements.

[0003] Currently, to increase the contact area between the powder and solvent and ensure thorough mixing, the powder is often produced as an ultrafine powder with a small particle size. A mixing device is then used to blend the ultrafine powder with the solvent. This not only prevents the formation of "fish eyes" in the resulting fracturing fluid and ensures sufficient powder swelling, but also meets the requirements of large-volume and ultra-large-volume fracturing operations. However, after mixing the ultrafine powder with the solvent using existing mixing devices, the pipelines of the mixing device need to be cleaned using an external cleaning system, which is inconvenient for on-site use.

[0004] Therefore, there is an urgent need for an ultrafine powder mixing device with self-cleaning function to solve the above problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this utility model is to provide an ultrafine powder mixing device with a self-cleaning function, which achieves automatic cleaning of the ultrafine powder mixing device while ensuring the swelling and dissolution effect of the ultrafine powder.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A self-cleaning ultrafine powder mixing device is provided for mixing ultrafine powder with a solvent, comprising:

[0008] support;

[0009] The feeding assembly is mounted on a support frame. The feeding assembly has a vertically extending feeding channel and a metering device configured to measure the dosage of ultrafine powder passing through the feeding channel.

[0010] A mixing tube is installed on the support. The mixing tube extends horizontally and is connected to the lower end of the feeding channel. The solvent can enter the mixing tube from the first end and flow out through the second end of the mixing tube. A liquid outlet valve is installed at the second end of the mixing tube. The liquid outlet valve is used to cut off or connect the mixing tube.

[0011] The return pipe is connected to the mixing pipe at one end and to the material discharge channel at the other end, and the diameter of the return pipe is smaller than the diameter of the mixing pipe.

[0012] The spiral stirring assembly is installed inside the mixing pipe and located between the liquid outlet valve and the feeding assembly;

[0013] An ultrasonic generator, located in the mixing pipe, is configured to emit ultrasonic waves toward the ultrafine powder passing through the helical mixing assembly.

[0014] Optionally, a first control valve is provided on the return pipe, and the first control valve is configured to shut off or connect the return pipe.

[0015] Optionally, the spiral mixing assembly includes a connecting shaft and spiral blades. The connecting shaft extends along the extension direction of the mixing pipe and is connected to the mixing pipe. The spiral blades are wound around the connecting shaft and are fixedly connected to the connecting shaft.

[0016] Optionally, the spiral mixing assembly also includes two connecting plates, which are respectively disposed at both ends of the connecting shaft and fixedly connected to the connecting shaft. The sidewalls of the connecting plates are sealed to the inner wall of the mixing pipe, and through holes are provided on the connecting plates.

[0017] Optionally, the spiral mixing assembly also includes a sealing ring disposed on the connecting plate, and the inner wall of the connecting plate and the mixing pipe are sealed together by the sealing ring.

[0018] Optionally, multiple helical blades are provided, and the multiple helical blades are arranged continuously along the extension direction of the mixing pipe.

[0019] Optionally, the feeding assembly includes a feeding funnel and a connecting pipe. The meter is set in the feeding funnel. One end of the connecting pipe is connected to the feeding funnel, and the other end is connected to the mixing pipe. The other end of the return pipe is connected to the connecting pipe. The inner cavity of the connecting pipe and the inner cavity of the feeding funnel form a feeding channel.

[0020] Optionally, a liquid conveying element is provided at the first end of the mixing pipe, and the liquid conveying element is configured to convey liquid to the first end of the mixing pipe.

[0021] Alternatively, the meter may employ a screw valve.

[0022] Optionally, the ultrafine powder mixing device with self-cleaning function also includes a walking component located at the bottom of the support.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] This invention provides a self-cleaning ultrafine powder mixing device. A metering device precisely controls the amount of ultrafine powder entering the mixing tube, ensuring the correct mixing ratio of ultrafine powder and solvent, and facilitating on-site adjustment of the fracturing fluid ratio according to specific conditions. The ultrafine powder entering the mixing tube through the feeding channel undergoes initial mixing with the solvent in the mixing tube, and then flows with the solvent to the spiral stirring assembly. The spiral stirring assembly drives the initially mixed ultrafine powder and solvent spirally towards the second end of the mixing tube, further mixing the ultrafine powder and solvent. Simultaneously, ultrasonic waves emitted by the ultrasonic generator break up any agglomerated ultrafine powder clusters, allowing the ultrafine powder to fully swell and dissolve in the solvent, improving the mixing effect between the ultrafine powder and solvent. After the fracturing operation is completed, the outlet valve is closed and cleaning fluid is introduced into the mixing pipe. The mixing pipe will be filled with cleaning fluid, ensuring that any part of the mixing pipe can be cleaned. Once the mixing pipe is full of cleaning fluid, it will overflow into the return pipe. Because the diameter of the return pipe is smaller than that of the mixing pipe, according to the Venturi principle, the flow rate of the cleaning fluid entering the return pipe will suddenly increase, and the pressure in the return pipe will decrease. As a result, the cleaning fluid can continuously enter the return pipe and then enter the feed channel, completing the cleaning of the feed assembly. In addition, after the feed assembly is cleaned, the outlet valve is opened and cleaning fluid continues to be injected into the mixing pipe. The cleaning fluid flows in the mixing pipe, improving the cleaning effect of the mixing pipe. Attached Figure Description

[0025] Figure 1 A schematic diagram of the ultrafine powder mixing device with self-cleaning function provided by this utility model.

[0026] in:

[0027] 1. Feeding assembly; 11. Feeding funnel; 12. Connecting pipe; 121. Second control valve;

[0028] 2. Mixed piping;

[0029] 3. Return pipe; 31. First control valve;

[0030] 4. Spiral stirring assembly; 41. Connecting shaft; 42. Spiral blades;

[0031] 5. Ultrasonic generator;

[0032] 6. Measuring instruments;

[0033] 71. Discharge valve; 72. Inlet valve;

[0034] 8. Liquid conveying components. Detailed Implementation

[0035] It should be understood that in the description of this utility model, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0036] It should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0038] like Figure 1 As shown, this embodiment provides an ultrafine powder mixing device with self-cleaning function, which achieves automatic cleaning of the ultrafine powder mixing device while ensuring the swelling and dissolution effect of the ultrafine powder.

[0039] See Figure 1 This self-cleaning ultrafine powder mixing device is used to mix ultrafine powder with solvent. It includes a support (not shown), a feeding assembly 1, a mixing tube 2, a return tube 3, a spiral stirring assembly 4, and an ultrasonic generator 5. The feeding assembly 1 is mounted on the support and has a vertically extending feeding channel. A metering device 6 is mounted on the feeding assembly 1 and is configured to measure the dosage of ultrafine powder passing through the feeding channel. The mixing tube 2 is mounted on the support, extends horizontally, and connects to the lower end of the feeding channel, allowing solvent to be supplied through the mixing tube. The first end of the mixture 2 enters the mixing pipe 2 and flows out through the second end of the mixing pipe 2. A liquid outlet valve 71 is provided at the second end of the mixing pipe 2. The liquid outlet valve 71 is used to cut off or connect the mixing pipe 2. One end of the return pipe 3 is connected to the mixing pipe 2, and the other end is connected to the feeding channel. The diameter of the return pipe 3 is smaller than the diameter of the mixing pipe 2. The spiral stirring assembly 4 is disposed in the inner cavity of the mixing pipe 2 and is located between the liquid outlet valve 71 and the feeding assembly 1. The ultrasonic generator 5 is disposed in the mixing pipe 2 and is configured to emit ultrasonic waves to the ultrafine powder passing through the spiral stirring assembly 4.

[0040] The self-cleaning ultrafine powder mixing device provided in this embodiment can accurately control the dosage of ultrafine powder entering the mixing pipe 2 through the metering device 6, so as to ensure the mixing ratio of ultrafine powder and solvent, and facilitate the adjustment of the fracturing fluid ratio at the construction site according to the specific situation. The ultrafine powder entering the mixing pipe 2 through the feeding channel can be initially mixed with the solvent in the mixing pipe 2, and then flow with the solvent to the spiral stirring component 4. The spiral stirring component 4 can drive the initially mixed ultrafine powder and solvent to move spirally to the second end of the mixing pipe 2. The spiral movement can further mix the ultrafine powder and solvent. At the same time, the ultrasonic waves emitted by the ultrasonic generator 5 can break up the agglomerated ultrafine powder, so that the ultrafine powder can fully swell and dissolve in the solvent, improving the mixing effect of ultrafine powder and solvent. After the fracturing operation is completed, the outlet valve 71 is closed and cleaning fluid is introduced into the mixing pipe 2. The mixing pipe 2 will be filled with cleaning fluid, so that any part of the mixing pipe 2 can be cleaned. When the mixing pipe 2 is full of cleaning fluid, the cleaning fluid will overflow into the return pipe 3. Since the diameter of the return pipe 3 is smaller than the diameter of the mixing pipe 2, the flow rate of the cleaning fluid entering the return pipe 3 will suddenly increase and the pressure in the return pipe 3 will decrease, so that the cleaning fluid can continuously enter the return pipe 3 and enter the feeding channel through the return pipe 3, thus completing the cleaning of the feeding component 1. In addition, after the feeding component 1 is cleaned, the outlet valve 71 is opened and cleaning fluid is injected into the mixing pipe 2. The cleaning fluid flows in the mixing pipe 2, which improves the cleaning effect of the mixing pipe 2.

[0041] Specifically, the horizontal extension of the mixing tube 2 reduces solvent energy loss and improves stirring efficiency. The ultrasonic cavitation effect of ultrasound releases a large amount of energy instantaneously from the inner wall to the center of the mixing tube 2, making the ultrafine powder more uniformly dispersed and promoting its swelling and dissolution. This fundamentally solves the problems of fish-eye formation and incomplete swelling and dissolution in ultrafine powders.

[0042] For example, the ultrafine powder mixing device provided in this embodiment can prepare a mixture with a maximum concentration of 1% ultrafine powder and an output discharge rate of 10m³. 3 / min-2m 3 Based on an ultrafine powder content of 0.02%-0.6% in the fracturing fluid, a discharge rate of 120 m³ / min can be achieved. 3 / min-50m 3 The fracturing fluid can be mixed online at a rate of / min, thus eliminating the need for a buffer tank and fully meeting the fracturing operation requirements for large and ultra-large displacements.

[0043] The first end and the second end are the two ends of the mixing pipe 2 along its extension direction, respectively. The second end is connected to an external pipeline to transport the mixed liquid to the sand mixing tank. In this embodiment, see... Figure 1The orientation is shown in the diagram, with the first end being the left end and the second end being the right end.

[0044] For example, the discharge valve 71 is a shut-off valve.

[0045] Optionally, see Figure 1 A first control valve 31 is installed on the reflux pipe 3. The first control valve 31 is configured to cut off or open the reflux pipe 3. During the mixing process, the first control valve 31 is closed to prevent solvent and ultrafine powder from entering the reflux pipe 3 and affecting the mixing ratio and mixing effect. When cleaning is required, the first control valve 31 is opened to allow the cleaning solution to enter the reflux pipe 3.

[0046] For example, the first control valve 31 is a shut-off valve.

[0047] Optionally, see Figure 1 The spiral stirring assembly 4 includes a connecting shaft 41 and spiral blades 42. The connecting shaft 41 extends along the extension direction of the mixing pipe 2 and is connected to the mixing pipe 2. The spiral blades 42 are wound around the connecting shaft 41 and are fixedly connected to the connecting shaft 41. This arrangement ensures that the spiral blades 42 can be firmly installed inside the mixing pipe 2 and will not move under the impact of the solvent, thus guaranteeing the stability of the spiral stirring assembly 4. On the other hand, it makes the spiral stirring assembly 4 a non-powered mixing component, allowing the mixture formed after the initial mixing of the ultrafine powder and the solvent to move along the spiral path while reducing energy consumption, thereby improving the mixing effect of the ultrafine powder and the solvent.

[0048] Specifically, the spiral flow channel formed by the spiral blades 42 not only increases the path length of the mixed liquid flow within a limited space, allowing sufficient space for the ultrafine powder and solvent to mix, but also reduces the space occupied by the ultrafine powder mixing device, increases its portability, and enables the ultrafine powder mixing device to meet the construction requirements of small platforms on complex mountainous terrain, improves construction safety, and reduces construction costs; the spiral flow channel also changes the flow pattern of the mixed liquid in the mixing pipe 2, enhances the turbulence intensity of the mixed liquid, and is more conducive to further mixing of the ultrafine powder and solvent.

[0049] In this embodiment, the spiral stirring assembly 4 further includes two connecting plates, which are respectively disposed at both ends of the connecting shaft 41 and fixedly connected to the connecting shaft 41. The sidewalls of the connecting plates are sealed to the inner wall of the mixing pipe 2. The connecting plates are provided with through holes, realizing the connection between the connecting shaft 41 and the mixing pipe 2. The sealing connection between the connecting plates and the mixing pipe 2 prevents the mixture from entering the spiral channel through the space between the connecting plates and the inner wall of the mixing pipe 2, and allows it to enter the spiral channel only through the through holes. Since the diameter of the through holes is smaller than the diameter of the mixing pipe 2, the mixture will be accelerated when passing through the through holes, thereby increasing the kinetic energy of the mixture and ensuring that the mixture can flow smoothly through the spiral blades 42 to the second end of the mixing pipe 2.

[0050] Specifically, the spiral stirring assembly 4 also includes a sealing ring disposed on the connecting plate. The inner cavity wall of the connecting plate and the mixing pipe 2 are sealed and connected by the sealing ring so that the connecting plate can be sealed and connected to the mixing pipe 2.

[0051] In this embodiment, the sealing ring is a rubber ring, which is vulcanized or bonded to the side wall of the connecting plate; in other embodiments, a sealing groove extending circumferentially is provided on the side wall of the connecting plate, the sealing ring is fitted into the sealing groove, and the sealing ring part protrudes from the surface of the side wall of the connecting plate so that the sealing ring can fully contact the inner cavity wall of the mixing pipe 2 to ensure the sealing effect.

[0052] Further, see Figure 1 Multiple spiral blades 42 are provided, and the multiple spiral blades 42 are continuously arranged along the extension direction of the mixing pipe 2, which increases the mixing path of ultrafine powder and solvent, and improves the mixing effect of ultrafine powder and solvent.

[0053] Optionally, see Figure 1 The feeding assembly 1 includes a feeding funnel 11 and a connecting pipe 12. A metering device 6 is disposed in the feeding funnel 11. One end of the connecting pipe 12 is connected to the feeding funnel 11, and the other end is connected to the mixing pipe 2. The other end of the return pipe 3 is connected to the connecting pipe 12. The inner cavity of the connecting pipe 12 and the inner cavity of the feeding funnel 11 form a feeding channel. The ultrafine powder enters the mixing pipe 2 sequentially through the feeding funnel 11 and the connecting pipe 12. The conical design of the feeding funnel 11 can guide the ultrafine powder smoothly into the connecting pipe 12, reduce the residence time of the ultrafine powder in the feeding funnel 11, and prevent the ultrafine powder from adhering to the inside of the feeding funnel 11.

[0054] In this embodiment, see Figure 1 The feeding hopper 11 includes two separable hoppers, one of which is connected to the connecting pipe 12, and the meter 6 is set on the other hopper.

[0055] Furthermore, a second control valve 121 is provided on the connecting pipe 12 to control the cutting off or connection of the connecting pipe 12, so as to be suitable for situations where the connecting pipe 12 needs to be cut off in an emergency.

[0056] For example, the second control valve 121 is a shut-off valve.

[0057] In this embodiment, see Figure 1 Meter 6 employs a screw valve. Tightening the screw and nut of the screw valve causes the gate to move up and down along the screw, thus opening and closing the screw valve. The structure of the screw and nut allows the screw valve to precisely control the dosage of ultrafine powder passing through it, ensuring the accuracy of the mixing ratio.

[0058] Optionally, see Figure 1 A liquid conveying component 8 is provided at the first end of the mixing pipe 2. The liquid conveying component 8 is configured to convey liquid to the first end of the mixing pipe 2 so that the solvent or cleaning solution can be continuously fed into the mixing pipe 2. The liquid conveying component 8 can drive the solvent into the mixing pipe 2 at high speed, thereby reducing the pressure inside the mixing pipe 2 and generating a negative pressure. Under the action of the negative pressure, the ultrafine powder in the connecting pipe 12 can be drawn into the mixing pipe 2, so that the ultrafine powder and the solvent are initially mixed.

[0059] For example, see Figure 1 The liquid delivery component 8 employs a centrifugal pump. The discharge pipe of the centrifugal pump is connected to the first end of the mixing pipe 2. The centrifugal pump's drive motor rotates the impeller via the pump shaft, generating centrifugal force. Under the action of centrifugal force, the liquid is thrown towards the impeller outlet along the blade flow channel. The liquid is collected by the volute and sent into the discharge pipe. The liquid gains energy from the impeller, increasing both its pressure and velocity energy, and uses this energy to deliver the liquid to the first end of the mixing pipe 2. Simultaneously, as the liquid is thrown towards the impeller outlet, a low pressure is created at the center of the impeller inlet, generating a pressure difference between the liquid in the suction tank and the liquid at the center of the impeller. Under this pressure difference, the liquid in the suction tank continuously enters the impeller through the suction pipe and the pump's suction chamber, thus continuously supplying solvent or cleaning agent into the mixing pipe 2.

[0060] Furthermore, a liquid inlet valve 72 is provided at the first end of the mixing pipe 2. The liquid inlet valve 72 is used to control the flow and closure of the first end of the mixing pipe 2. When the liquid conveying component 8 fails, the first end of the mixing pipe 2 can be quickly cut off by the liquid inlet valve 72 to prevent liquid from continuing to enter the mixing pipe.

[0061] Optionally, the ultrafine powder mixing device with self-cleaning function also includes a walking component located at the bottom of the support to facilitate the movement of the ultrafine powder mixing device.

[0062] For example, the walking assembly uses casters located at the four corners of the bottom of the support to facilitate movement of the ultrafine powder mixing device in any direction.

[0063] Furthermore, the walking assembly also includes a brake. When the ultrafine powder mixing device is pushed or pulled to the predetermined position, the brake can be used to brake the caster, thereby keeping the ultrafine powder mixing device stationary in the predetermined position. When it is necessary to move the ultrafine powder mixing device, simply release the brake to allow the caster to return to a rotatable state.

[0064] The above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.

Claims

1. A self-cleaning ultrafine powder mixing device for mixing ultrafine powder with a solvent, characterized in that, include: support; A feeding assembly (1) is provided on the support. A vertically extending feeding channel is provided on the feeding assembly (1). A meter (6) is provided on the feeding assembly (1). The meter (6) is configured to measure the dosage of ultrafine powder passing through the feeding channel. A mixing tube (2) is provided on the support. The mixing tube (2) extends horizontally and is connected to the lower end of the feeding channel. The solvent can enter the mixing tube (2) from the first end and flow out through the second end of the mixing tube (2). A liquid outlet valve (71) is provided at the second end of the mixing tube (2). The liquid outlet valve (71) is used to cut off or connect the mixing tube (2). The return pipe (3) is connected at one end to the mixing pipe (2) and at the other end to the feeding channel, and the diameter of the return pipe (3) is smaller than the diameter of the mixing pipe (2); The spiral stirring assembly (4) is disposed in the inner cavity of the mixing pipe (2) and located between the liquid outlet valve (71) and the feeding assembly (1); An ultrasonic generator (5) is disposed in the mixing tube (2) and is configured to emit ultrasonic waves to the ultrafine powder passing through the spiral stirring assembly (4).

2. The ultrafine powder mixing device with self-cleaning function according to claim 1, characterized in that, A first control valve (31) is provided on the return pipe (3), and the first control valve (31) is configured to cut off or connect the return pipe (3).

3. The ultrafine powder mixing device with self-cleaning function according to claim 1, characterized in that, The spiral stirring assembly (4) includes a connecting shaft (41) and a spiral blade (42). The connecting shaft (41) extends along the extension direction of the mixing pipe (2) and is connected to the mixing pipe (2). The spiral blade (42) is wound around the connecting shaft (41) and is fixedly connected to the connecting shaft (41).

4. The ultrafine powder mixing device with self-cleaning function according to claim 3, characterized in that, The spiral stirring assembly (4) also includes two connecting plates, which are respectively disposed at both ends of the connecting shaft (41) and fixedly connected to the connecting shaft (41). The side wall of the connecting plate is sealed to the inner cavity wall of the mixing pipe (2), and the connecting plate is provided with a through hole.

5. The ultrafine powder mixing device with self-cleaning function according to claim 4, characterized in that, The spiral stirring assembly (4) also includes a sealing ring disposed on the connecting plate, and the inner cavity wall of the connecting plate and the mixing pipe (2) are sealed and connected by the sealing ring.

6. The ultrafine powder mixing device with self-cleaning function according to claim 3, characterized in that, There are multiple spiral blades (42), and the multiple spiral blades (42) are arranged continuously along the extension direction of the mixing pipe (2).

7. The ultrafine powder mixing device with self-cleaning function according to any one of claims 1-6, characterized in that, The feeding assembly (1) includes a feeding funnel (11) and a connecting pipe (12). The meter (6) is disposed in the feeding funnel (11). One end of the connecting pipe (12) is connected to the feeding funnel (11), and the other end is connected to the mixing pipe (2). The other end of the return pipe (3) is connected to the connecting pipe (12). The inner cavity of the connecting pipe (12) and the inner cavity of the feeding funnel (11) form the feeding channel.

8. The ultrafine powder mixing device with self-cleaning function according to any one of claims 1-6, characterized in that, The first end of the mixing pipe (2) is provided with a liquid conveying component (8), which is configured to convey liquid to the first end of the mixing pipe (2).

9. The ultrafine powder mixing device with self-cleaning function according to any one of claims 1-6, characterized in that, The meter (6) uses a spiral valve.

10. The ultrafine powder mixing device with self-cleaning function according to any one of claims 1-6, characterized in that, The ultrafine powder mixing device with self-cleaning function also includes a walking component disposed at the bottom of the support.

Images