A continuous mixing device for a dry powder thickening fracturing fluid

Abstract

The present invention discloses a continuous mixing device for dry powder variable-viscosity fracturing fluid, which relates to the field of dry powder mixing. It includes a mixing tank. Four groups of raw material barrels and a mixing mechanism are installed at the top of the mixing tank. The raw material barrels are connected to the mixing mechanism through pipelines. An exhaust cover plate is installed at the top of the mixing mechanism. The exhaust cover plate is hermetically attached to the top of the mixing mechanism. When the internal air pressure of the mixing mechanism increases, the exhaust cover plate moves upward. A motor is installed at the bottom of the mixing tank. During the mixing process of the present invention, the motor drives the rotating shaft to rotate, and the rotating shaft drives the stirring fan blades and the flow fan blades to rotate. The stirring fan blades mix the raw materials, and the flow fan blades drive the air flow to flow, so that the air flow is first discharged through the exhaust cover plate. After the internal air pressure of the mixing tank decreases, the remaining air flow will enter the mixing tank through the return pipe to stir the raw materials that sink to the bottom in the mixing tank, thereby facilitating the mixing of the raw materials.

Description

Technical Field

[0001] The present invention relates to the field of dry powder mixing, and specifically to a continuous mixing device for dry powder variable viscosity fracturing fluid. Background Technique

[0002] Viscous fracturing fluid is a liquid used in hydraulic fracturing operations. Its main function is to introduce fractures into the formation through high pressure to assist in the extraction of oil, gas and other resources. The characteristics of viscous fracturing fluid are strong viscosity and elasticity, which can form good support force in the fractures, prevent the fractures from collapsing, and promote the flow of oil and gas in the formation. It is usually composed of water, sand, chemical additives and polymer. The polymer gives the liquid a higher viscosity, enabling it to better carry proppants (such as sand) into the fractures during the fracturing process. In the existing production process of viscous fracturing fluid, it is usually stirred on-site and pumped in on-site. Generally, mixing equipment is used to continuously stir and mix various raw materials.

[0003] An existing technology, such as a continuous mixing device for dry powder variable viscosity fracturing fluid disclosed in Chinese Patent Publication No. CN118341311A, includes:

[0004] A mixing tank for pre-mixing the fracturing fluid raw materials. The mixing tank is provided with a liquid inlet, a dry powder inlet and a pre-mixed product discharge port. The included angle between the center line of the liquid inlet and the radial line of the mixing tank is an acute angle or a right angle, and the included angle between the center line of the liquid inlet and the center line of the mixing tank is an acute angle or a right angle, so that the liquid generates a swirl in the mixing tank after entering the mixing tank from the liquid inlet; a guide plate is provided on the annular inner wall of the mixing tank, and the included angle between the guide plate and the center line of the mixing tank is an acute angle, which is used to guide the rotating fluid to flow along the axial direction of the mixing tank; the pre-mixed product discharge port is located at the bottom of the mixing tank, and the dry powder inlet is located at the top of the mixing tank;

[0005] A booster pump with an inlet communicating with the pre-mixed product discharge port, which is used to boost the pressure of the pre-mixed fracturing fluid in the mixing tank;

[0006] An emulsifying pump with an inlet communicating with the outlet of the booster pump, which is used to perform high-speed shear mixing on the fracturing fluid.

[0007] During the mixing process of the prior art, multiple feeding ports are usually adopted to add different powders. Although this method can avoid the mutual mixing of powders, it will cause a relatively large opening at the top of the equipment. When using the up-and-down stirring method during the stirring process, water will splash into the inside of the feeding pipe, and over time, the inner wall of the feeding pipe will become caked and blocked. If the cleaning method is adopted, multiple feeding ports need to be cleaned, and the effect is poor. Secondly, during the stirring process, although the powders are quickly mixed and stirred by the different shear forces of the water flow to reduce the generation of caking, a large number of bubbles will be generated during the stirring process, thus affecting the quality of the viscous fracturing fluid. Summary of the Invention

[0008] Based on this, the purpose of the present invention is to provide a continuous mixing device for dry powder to viscous fracturing fluid to solve the technical problems of inconvenient cleaning of the inner wall of the feeding pipeline and the bubbles generated during the stirring process affecting the quality.

[0009] To achieve the above object, the present invention provides the following technical solution: A continuous mixing device for dry powder to viscous fracturing fluid, including a stirring tank. Four raw material barrels and a mixing mechanism are installed at the top of the stirring tank. The raw material barrels are connected to the mixing mechanism through pipelines. An exhaust cover plate is installed at the top of the mixing mechanism, and the exhaust cover plate is hermetically fitted to the top of the mixing mechanism. When the air pressure inside the mixing mechanism increases, the exhaust cover plate moves upward. A motor is installed at the bottom of the stirring tank, and the output end of the motor is connected to a rotating shaft. The rotating shaft penetrates through the stirring tank and extends into the mixing mechanism. Stirring blades and flow blades are installed on the outer side of the rotating shaft. The stirring blades are located inside the stirring tank, and the flow blades are located inside the mixing mechanism, and the flow blades are located above the connection ports of the raw material barrels. A stirring structure is installed on the outer wall of the rotating shaft, and the stirring structure mixes the incoming raw materials. An inner support frame is installed inside the mixing mechanism, and the bottom end of the inner support frame extends into the stirring tank and is installed with a baffle plate. Four return pipes are installed on the outer side of the mixing mechanism, and the return pipes extend to the bottom of the stirring tank.

[0010] By adopting the above technical solution, it is convenient to mix the raw materials, and the raw materials are broken by the stirring structure, reducing the splashing water droplets falling into the stirring tank and preventing water from entering the mixing mechanism. During the stirring process, air flow is injected into the stirring tank through the return pipes to stir and mix the impurities settled at the bottom.

[0011] The present invention is further arranged such that a top plate is installed at the top of the stirring tank. The raw material barrels and the mixing mechanism are located above the top plate. A support frame is also installed at the top of the stirring tank, and the raw material barrels are fixed inside the support frame. A discharge port and two support legs are connected to the side of the stirring tank, and the two support legs are symmetrically arranged.

[0012] Preferably, it is possible to conveniently limit the mixing tank and the raw material barrel, facilitating the entry of raw materials into the mixing tank.

[0013] The present invention is further configured such that a cover plate is installed at the top end of the raw material barrel. A rotating shaft is connected to the side surface of the cover plate. The cover plate is rotatably connected to the raw material barrel through the rotating shaft. A handle is connected to the top end of the cover plate. An insertion tube is installed at the bottom end of the raw material barrel. The insertion tube is connected to the mixing mechanism, and a control valve is installed inside the insertion tube to control the flow of the insertion tube.

[0014] Preferably, it is convenient to inject raw materials into the raw material barrel and control the time and sequence of the raw materials entering the mixing mechanism according to the valve.

[0015] The present invention is further configured such that a fixing seat is installed outside the mixing mechanism. The mixing mechanism is fixedly connected to the mixing tank through the fixing seat. Multiple first connecting pipes are installed above the fixing seat of the mixing mechanism. The mixing mechanism is connected to the raw material barrel through the first connecting pipes. Multiple second connecting pipes are installed at the top end of the mixing mechanism. The reflux pipe is connected to the mixing mechanism through the second connecting pipes. An exhaust port is opened at the middle position among the multiple second connecting pipes at the top end of the mixing mechanism, and an exhaust cover plate is located above the exhaust port.

[0016] Preferably, it is possible to conveniently discharge the air in the mixing tank through the exhaust port, reducing the air pressure in the mixing tank.

[0017] The present invention is further configured such that a fixing plate is installed inside the mixing mechanism. An activity rod and a protruding edge are connected to the bottom end of the exhaust cover plate. A groove is opened at the top end of the mixing mechanism. The exhaust cover plate is engaged with the groove through the activity rod. A spring sleeve is connected to the top end of the fixing plate. The activity rod is inserted into the inside of the spring sleeve.

[0018] Preferably, it is possible to conveniently seal the exhaust cover plate and the mixing mechanism, improving the sealing effect.

[0019] The present invention is further configured such that a guiding rod is installed at the middle position of the rotating shaft. Lower and upper toothed rings are installed at the top and bottom ends of the guiding rod. The guiding rod is located inside the inner support frame. A mixing disk is installed outside the inner support frame. The mixing disk includes a gear, a connecting rod, and a twisted iron rod. The gear meshes with the lower and upper toothed rings. The twisted iron rod is aligned with the first connecting pipe.

[0020] Preferably, it is convenient to drive the mixing disk to rotate, thereby driving the twisted iron rod to crush and stir the raw materials.

[0021] The present invention is further configured such that the lower and upper toothed rings are of semi-ring structure and are arranged staggeredly.

[0022] Preferably, it is convenient to drive the mixing disk to rotate at different angles.

[0023] The present invention is further configured such that a slot is provided at the top end of the inner support frame, and the top end of the inner support frame is located below the flow fan blades. The width of the baffle plate connected to the bottom end of the inner support frame is greater than the opening at the bottom end of the mixing mechanism.

[0024] Preferably, it can conveniently seal the mixing mechanism and reduce the probability of splashing of the stirred water into the mixing mechanism.

[0025] In summary, the present invention mainly has the following beneficial effects:

[0026] 1. Through the provided mixing mechanism of the present invention, during use, the raw materials are injected into the mixing mechanism through the raw material barrel. The rotating shaft rotates to drive the outer groups of mixing disks to rotate at multiple angles, and the mixing disks are aligned with the feeding ports. The fed raw materials will be broken under the action of the twisted iron rods at the ends of the mixing disks. The broken raw materials will fall onto the baffle plate, preventing the raw materials from directly falling into the stirring tank, reducing the splashing of liquid, and through the baffle plate, it can effectively reduce the splashing of liquid into the mixing mechanism during the stirring process and reduce the pollution in the mixing mechanism.

[0027] 2. Through the provided mixing mechanism, exhaust cover plate and motor of the present invention, during the mixing process, the motor drives the rotating shaft to rotate, and the rotating shaft drives the stirring fan blades and the flow fan blades to rotate. The stirring fan blades mix the raw materials, and the flow fan blades drive the air flow to flow, so that the air flow is first discharged through the exhaust cover plate. When the air pressure inside the stirring tank decreases, the remaining air flow will enter the stirring tank through the return pipe to stir the raw materials settled at the bottom of the stirring tank, thus facilitating the mixing of the raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of the present invention;

[0029] Figure 2 is a schematic structural diagram of the raw material barrel of the present invention;

[0030] Figure 3 is a schematic structural diagram of the mixing mechanism of the present invention;

[0031] Figure 4 is a schematic cross-sectional structural diagram of the mixing mechanism of the present invention;

[0032] Figure 5 is a schematic cross-sectional structural diagram of the stirring tank of the present invention;

[0033] Figure 6 is a schematic structural diagram of the connection between the mixing mechanism and the top plate of the present invention;

[0034] Figure 7 This is a schematic structural diagram of the flow fan blade of the present invention;

[0035] Figure 8 This is a schematic structural diagram of the mixing disk of the present invention;

[0036] Figure 9 This is a schematic structural diagram of the exhaust cover plate of the present invention.

[0037] Explanation of reference numerals:

[0038] 1, stirring tank; 101, top plate; 102, support frame; 103, discharge port; 104, support leg; 2, raw material barrel; 201, cover plate; 202, rotating shaft; 203, handle; 204, insertion tube; 205, control valve; 3, mixing mechanism; 301, fixed seat; 302, first connecting pipe; 303, second connecting pipe; 4, exhaust cover plate; 401, fixing plate; 402, movable rod; 403, protruding edge; 404, spring sleeve; 5, motor; 501, rotating shaft; 5011, guide rod; 5012, lower tooth ring; 5013, upper tooth ring; 502, stirring fan blade; 503, flow fan blade; 6, mixing disk; 601, gear; 602, connecting rod; 603, twisted iron rod; 7, inner support frame; 8, baffle plate; 9, return pipe. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0040] Next, the embodiments of the present invention will be described according to the overall structure of the present invention.

[0041] Please refer to Figures 1 to 5, including a mixing tank 1, on the top end of the mixing tank 1, four groups of raw material barrels 2 and a mixing mechanism 3 are installed. On the top end of the mixing tank 1, a top plate 101 is installed. The raw material barrels 2 and the mixing mechanism 3 are located above the top plate 101. On the top end of the mixing tank 1, a support frame 102 is also installed. The raw material barrels 2 are fixed inside the support frame 102. On the side of the mixing tank 1, a discharge port 103 and two support legs 104 are connected. The two support legs 104 are symmetrically arranged. On the top end of the raw material barrel 2, a cover plate 201 is installed. On the side of the cover plate 201, a rotating shaft 202 is connected. The cover plate 201 is rotationally connected to the raw material barrel 2 through the rotating shaft 202. On the top end of the cover plate 201, a handle 203 is connected, which is convenient for opening the raw material barrel 2 and putting raw materials into the raw material barrel 2. On the bottom end of the raw material barrel 2, an insertion pipe 204 is installed. The insertion pipe 204 is connected to the mixing mechanism 3, and a control valve 205 is installed inside the insertion pipe 204. The control valve 205 controls the flow of the insertion pipe 204, which is convenient for injecting different raw materials into the mixing tank 1 through the raw material barrel 2 and controlling through the valve.

[0042] Please refer to Figure 3 , 4 and Figure 9 , on the top end of the mixing mechanism 3, an exhaust cover plate 4 is installed. The exhaust cover plate 4 is hermetically fitted to the top end of the mixing mechanism 3. When the internal air pressure of the mixing mechanism 3 increases, the exhaust cover plate 4 moves upward. On the bottom end of the mixing tank 1, a motor 5 is installed. The output end of the motor 5 is connected to a rotating shaft 501. The rotating shaft 501 penetrates through the mixing tank 1 and extends into the interior of the mixing mechanism 3. On the outer side of the rotating shaft 501, stirring fan blades 502 and flow fan blades 503 are installed. The stirring fan blades 502 are located inside the mixing tank 1, and the flow fan blades 503 are located inside the mixing mechanism 3, and the flow fan blades 503 are located above the connection port of the raw material barrel 2. On the outer wall of the rotating shaft 501, a stirring structure is installed. The stirring structure mixes the incoming raw materials. Inside the mixing mechanism 3, an inner support frame 7 is installed. The bottom end of the inner support frame 7 extends into the mixing tank 1 and is installed with a baffle plate 8, which can drive air flow into the mixing mechanism 3 through the flow fan blades 503 when stirring the raw materials, and the air flow pushes the exhaust cover plate 4 to open, sending out part of the air flow in the mixing tank 1 and reducing the air pressure in the mixing tank 1.

[0043] Please refer to Figures 3 to 9, a fixing seat 301 is installed on the outside of the mixing mechanism 3. The mixing mechanism 3 is fixedly connected to the mixing tank 1 through the fixing seat 301. Multiple groups of first connecting pipes 302 are installed above the fixing seat 301 on the mixing mechanism 3. The mixing mechanism 3 is connected to the raw material barrel 2 through the first connecting pipes 302. Multiple groups of second connecting pipes 303 are installed at the top of the mixing mechanism 3. The return pipe 9 is connected to the mixing mechanism 3 through the second connecting pipes 303. Four groups of return pipes 9 are installed on the outside of the mixing mechanism 3, and the return pipes 9 extend to the bottom end of the mixing tank 1. After exhausting, the remaining air flow can be introduced into the mixing tank 1 to clean the raw materials settled at the bottom, so that the raw materials are fully mixed. An exhaust port is opened at the middle position among multiple groups of second connecting pipes 303 at the top of the mixing mechanism 3. The exhaust cover plate 4 is located above the exhaust port. A guide rod 5011 is installed at the middle position of the rotating shaft 501. Lower tooth rings 5012 and upper tooth rings 5013 are installed at the top and bottom ends of the guide rod 5011 respectively. The guide rod 5011 is located inside the inner support frame 7. A mixing disk 6 is installed on the outside of the inner support frame 7. The mixing disk 6 includes a gear 601, a connecting rod 602, and a twisted iron rod 603. The gear 601 meshes with the lower tooth ring 5012 and the upper tooth ring 5013. The twisted iron rod 603 is aligned with the first connecting pipe 302. A slot is opened at the top end of the inner support frame 7, and the top end of the inner support frame 7 is located below the flow fan blade 503. The width of the baffle plate 8 connected to the bottom end of the inner support frame 7 is greater than the opening at the bottom end of the mixing mechanism 3. During the feeding process, the injected raw materials can be stirred and dispersed by the mixing disk 6, thereby improving the mixing effect. Moreover, the baffle plate 8 can not only reduce the speed of the raw materials hitting the mixture, reduce the splashing of water, but also reduce the splashing of water generated during the stirring process into the mixing mechanism 3.

[0044] Please refer to Figure 9 , a fixing plate 401 is installed inside the mixing mechanism 3. The bottom end of the exhaust cover plate 4 is connected with a movable rod 402 and a protruding edge 403. A groove is opened at the top end of the mixing mechanism 3. The exhaust cover plate 4 is engaged with the groove through the movable rod 402. The top end of the fixing plate 401 is connected with a spring sleeve 404. The movable rod 402 is inserted into the inside of the spring sleeve 404, which can conveniently limit the exhaust cover plate 4 and facilitate the discharge of gas from the mixing tank 1.

[0045] In the above embodiment, specifically, please refer to Figure 7 , the lower tooth ring 5012 and the upper tooth ring 5013 are semi-ring structures, and the lower tooth ring 5012 and the upper tooth ring 5013 are arranged staggeredly, which is convenient to drive the mixing disk 6 to rotate in different directions, thereby improving the crushing of raw materials.

[0046] During assembly, first install the motor 5 below the mixing tank 1, insert the rotating shaft 501 into the mixing tank 1, insert the inner support frame 7 outside the rotating shaft 501, and fix the inner support frame 7. At this time, the gear 601 meshes with the lower tooth ring 5012. Install each group of mixing disks 6 outside the rotating shaft 501, then install the upper sleeve outside the rotating shaft 501. The upper tooth ring 5013 is connected to the top of the gear 601. Install the flow fan blades 503 outside the sleeve. Subsequently, insert the fixing rod into the sleeve to fix and limit the sleeve, completing the installation of the flow fan blades 503. Then install the mixing mechanism 3 above the top plate 101, and fix the mixing mechanism 3 through bolts and the fixing seat 301, and align the exhaust cover plate 4 with the flow fan blades 503. After that, install each group of return pipes 9 outside the mixing tank 1. The top of the return pipe 9 is connected to the second connecting pipe 303, and the bottom of the return pipe 9 is connected to the bottom of the mixing tank 1. Then install the support frame 102 above the top plate 101, then install the raw material bucket 2 in the support frame 102, and insert the insertion pipe 204 into the first connecting pipe 302, realizing the assembly of the raw material bucket 2.

[0047] During use, inject each group of raw materials into the mixing tank 1 through the raw material bucket 2. During the injection process, first start the motor 5. The motor 5 drives each rotating shaft 501 to rotate. At this time, the rotating shaft 501 will drive the gear 601 to rotate forward and backward through the lower tooth ring 5012 and the upper tooth ring 5013. At this time, open the insertion pipe 204 by controlling the valve 205, and the raw materials fall into the mixing mechanism 3 from the raw material bucket 2. At this time, the mixing disks 6 that rotate forward and backward rotate, and the twisted iron rod 603 crushes the raw materials. The crushed raw materials fall on the baffle plate 8 and finally fall into the mixing tank 1. The rotating shaft 501 drives the mixing fan blades 502 and the flow fan blades 503 to rotate. The mixing fan blades 502 will mix and stir the raw materials. During the stirring process, the rotating shaft 501 will drive the top flow fan blades 503 to rotate. The flow fan blades 503 drive the upward airflow, increasing the air pressure at the top position of the mixing mechanism 3. The airflow will push the fixed plate 401 to pull the spring sleeve 404 upward, discharging part of the air in the mixing tank 1 and reducing the air pressure in the mixing tank 1. When the air pressure reaches the appropriate range, the spring sleeve 404 pulls the exhaust cover plate 4 back to its original position to continue sealing the mixing tank 1. And at this time, the flow fan blades 503 continue to drive the airflow to flow, so as to inject the airflow into the bottom of the mixing tank 1 through the return pipe 9, making the airflow enter the mixing tank 1 from below, further blowing up the raw materials that have sunk to the bottom, facilitating further mixing and stirring of the raw materials, and improving the stirring effect;

[0048] After the stirring is completed, the mixed viscous fracturing fluid is discharged through the discharge port 103. After the discharge, the inside of the stirring tank 1 needs to be cleaned. At this time, water is injected into the inside of the stirring tank 1 until the water overflows the second connecting pipe 303, and the motor 5 is started in reverse. The motor 5 drives the rotating shaft 501 to rotate in reverse. At this time, the stirring fan blades 502 and the flow fan blades 503 are driven to rotate in reverse, driving the water to flow downward. The water flows into the mixing mechanism 3 through the return pipe 9 to clean the inside of the mixing mechanism 3, thereby cleaning the inside of the equipment.

[0049] Although the embodiments of the present invention have been shown and described, the specific embodiments are only explanations of the present invention and are not limitations of the invention. The specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art can make modifications, substitutions and variations without creative contributions to the embodiments as needed, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A continuous mixing device for dry powder thickening fracturing fluid, comprising a stirring tank (1), characterized in that: At the top of the mixing tank (1), four raw material barrels (2) and a mixing mechanism (3) are installed. The raw material barrels (2) are connected to the mixing mechanism (3) through pipelines. An exhaust cover plate (4) is installed at the top of the mixing mechanism (3), and the exhaust cover plate (4) is hermetically attached to the top of the mixing mechanism (3). When the internal air pressure of the mixing mechanism (3) increases, the exhaust cover plate (4) moves upward. A motor (5) is installed at the bottom of the mixing tank (1), and the output end of the motor (5) is connected to a rotating shaft (501). The rotating shaft (501) penetrates through the mixing tank (1) and extends into the mixing mechanism (3). A mixing fan blade (502) and a flow fan blade (503) are installed on the outer side of the rotating shaft (501). The mixing fan blade (502) is located inside the mixing tank (1), and the flow fan blade (503) is located inside the mixing mechanism (3), and the flow fan blade (503) is located above the connection port of the raw material barrel (2). A stirring structure is installed on the outer wall of the rotating shaft (501), and the stirring structure mixes the incoming raw materials. An inner support frame (7) is installed inside the mixing mechanism (3), and the bottom end of the inner support frame (7) extends into the mixing tank (1) and is installed with a baffle plate (8). Four return pipes (9) are installed on the outer side of the mixing mechanism (3), and the return pipes (9) extend to the bottom end of the mixing tank (1). Multiple second connecting pipes (303) are installed at the top of the mixing mechanism (3). The return pipes (9) are connected to the mixing mechanism (3) through the second connecting pipes (303). An exhaust port is opened at the middle position of the top of the mixing mechanism (3) among multiple second connecting pipes (303), and the exhaust cover plate (4) is located above the exhaust port. A fixed plate (401) is installed inside the mixing mechanism (3). The bottom end of the exhaust cover plate (4) is connected with a movable rod (402) and a protruding edge (403). A groove is opened at the top of the mixing mechanism (3), and the exhaust cover plate (4) is engaged with the groove through the movable rod (402). The top end of the fixed plate (401) is connected with a spring sleeve (404), and the movable rod (402) is inserted into the spring sleeve (404).

2. The continuous mixing device for dry powder variable-viscosity fracturing fluid according to claim 1, characterized in that: A top plate (101) is installed at the top of the mixing tank (1). The raw material barrels (2) and the mixing mechanism (3) are located above the top plate (101). A support frame (102) is also installed at the top of the mixing tank (1), and the raw material barrels (2) are fixed inside the support frame (102). A discharge port (103) and two support legs (104) are connected to the side of the mixing tank (1), and the two support legs (104) are symmetrically arranged.

3. The continuous mixing device for dry powder variable-viscosity fracturing fluid according to claim 1, characterized in that: A cover plate (201) is installed at the top of the raw material barrel (2). A rotating shaft (202) is connected to the side of the cover plate (201). The cover plate (201) is rotatably connected to the raw material barrel (2) through the rotating shaft (202). A handle (203) is connected to the top of the cover plate (201). An insertion pipe (204) is installed at the bottom of the raw material barrel (2). The insertion pipe (204) is connected to the mixing mechanism (3), and a control valve (205) is installed inside the insertion pipe (204). The control valve (205) controls the flow of the insertion pipe (204).

4. The continuous mixing device for dry powder variable-viscosity fracturing fluid according to claim 1, wherein: A fixing seat (301) is installed on the outside of the mixing mechanism (3). The mixing mechanism (3) is fixedly connected to the mixing tank (1) through the fixing seat (301). A plurality of first connecting pipes (302) are installed above the fixing seat (301) of the mixing mechanism (3). The mixing mechanism (3) is connected to the raw material barrel (2) through the first connecting pipes (302).

5. The continuous mixing device for dry powder variable-viscosity fracturing fluid according to claim 4, wherein: A guide rod (5011) is installed at the middle position of the rotating shaft (501). Lower tooth rings (5012) and upper tooth rings (5013) are installed at the top and bottom of the guide rod (5011). The guide rod (5011) is located inside the inner support frame (7). A mixing disc (6) is installed on the outside of the inner support frame (7). The mixing disc (6) includes a gear (601), a connecting rod (602), and a twisted iron rod (603). The gear (601) meshes with the lower tooth ring (5012) and the upper tooth ring (5013). The twisted iron rod (603) is aligned with the first connecting pipe (302).

6. The continuous mixing device for dry powder variable-viscosity fracturing fluid according to claim 5, characterized in that: The lower tooth ring (5012) and the upper tooth ring (5013) are semi-ring structures, and the lower tooth ring (5012) and the upper tooth ring (5013) are arranged alternately.

7. A continuous mixing device for dry powder variable-viscosity fracturing fluid according to claim 1, characterized in that: A slot is opened at the top of the inner support frame (7), and the top of the inner support frame (7) is located below the flow fan blade (503). The width of the shielding plate (8) connected to the bottom of the inner support frame (7) is greater than the opening at the bottom of the mixing mechanism (3).

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