An additive pumping device for fracturing

Abstract

The application discloses a fracturing additive pumping device, which comprises a bottom plate, a fracturing fluid tank, an additive liquid tank, a mixing output structure and a stirring structure are arranged on the bottom plate. The additive liquid revolution and rotation are realized by double-motor driving of the stirring structure, the uniformity of mixing is improved by 15%, the shunt hole in the mixing output structure is arranged obliquely, the additive liquid is injected tangentially to form vortex, the mixing time is shortened by 25%, and a plurality of communication assemblies enable the matching precision error to be controlled within ±5%. The device can realize efficient mixing and accurate conveying of the fracturing fluid and the additive liquid, and effectively improve the formation permeability.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic fracturing technology in coal mines, specifically to a fracturing additive pumping device. Background Technology

[0002] In the process of oil and gas extraction, fracturing technology is an important means to improve formation permeability and increase oil and gas production.

[0003] As a key piece of equipment in fracturing operations, the performance of fracturing additive pumping devices directly affects the fracturing effect.

[0004] Existing fracturing additive pumping systems have several problems, as follows:

[0005] The additive solution was mixed extremely unevenly within the tank, resulting in very poor stability of the fracturing fluid performance. The mixing method between the fracturing fluid and the additive solution was inefficient, with long mixing times, which affected operational efficiency.

[0006] During the delivery process, it is difficult to accurately control the ratio of fracturing fluid and additive fluid, resulting in waste of resources and failure to achieve the best fracturing effect. Utility Model Content

[0007] To address the aforementioned technical problems, this application solves the problem of uneven mixing of additive liquid in existing fracturing additive pumping devices.

[0008] To achieve the above objectives, the technical solution adopted in this application is as follows: a fracturing additive pumping device, comprising a base plate, wherein a fracturing fluid tank and an additive liquid tank are provided on the upper surface of the base plate, a fracturing fluid inlet is provided on the top surface of the fracturing fluid tank, and a fracturing fluid outlet is provided on the bottom side wall of the fracturing fluid tank.

[0009] The top surface of the additive liquid tank has an additive liquid inlet, and the bottom side wall of the additive liquid tank has an additive liquid outlet.

[0010] The base plate is provided with a mixing output structure on its upper surface between the fracturing fluid tank and the additive fluid tank. The top surface of the additive fluid tank is provided with a stirring structure, and the stirring part of the stirring structure is placed inside the additive fluid tank.

[0011] To better realize this utility model, the top surface of the additive liquid tank is further provided with a circular window, and a disc is arranged inside the circular window. A pair of symmetrically arranged support frames are provided on the surface of the additive liquid tank outside the circular window. The disc is fixedly connected to the support frames through a first connecting rod. A shaft hole is provided at the center of the disc. A first motor mounting seat is provided on the surface of the disc outside the shaft hole. An additive liquid inlet is provided on the top surface of the additive liquid tank outside the circular window, and the additive liquid inlet is located between the two support frames.

[0012] To better realize this utility model, the mixed output structure further includes a fracturing fluid main pipeline, the input end of which is connected to the fracturing fluid outlet, a fourth valve at the input end of the fracturing fluid main pipeline, a first fracturing pump at the middle and rear section of the fracturing fluid main pipeline, multiple horizontally arranged first diversion pipelines vertically connected at the rear section of the fracturing fluid main pipeline, a first flow meter at the front section of the first diversion pipeline, a first valve at the portion of the first diversion pipeline between the input end of the first diversion pipeline and the first flow meter, a sleeve sleeved on the front middle section of the first diversion pipeline, an annular diversion cavity formed between the first diversion pipeline and the sleeve, and a diversion hole communicating with the annular diversion cavity on the first diversion pipeline;

[0013] The additive liquid outlet is connected to an additive liquid main pipeline, the input end of the additive liquid main pipeline is equipped with a third valve, the middle and rear section of the additive liquid main pipeline is equipped with a second fracturing pump, and the output end of the additive liquid main pipeline is vertically connected to a horizontally arranged second diversion pipeline, which is connected to multiple annular diversion cavities through multiple sets of connecting components.

[0014] To better realize this utility model, further, multiple sets of the connecting components are arranged at equal intervals along the length direction of the first diversion pipe;

[0015] Each set of connecting components includes a first branch pipe, a second branch pipe, and a third branch pipe. The input end of the first branch pipe is connected to the second branch pipe, and the output end of the first branch pipe is connected to the annular branch cavity. The input end of the second branch pipe is connected to the second branch pipe, and the output end of the second branch pipe is connected to the annular branch cavity. The input end of the third branch pipe is connected to the second branch pipe, and the output end of the third branch pipe is connected to the annular branch cavity.

[0016] The first branch pipe, the second branch pipe, and the third branch pipe are each equipped with a second valve and a second flow meter in sequence along the flow direction.

[0017] To better realize this utility model, the diversion hole is further arranged at an angle, with the input end of the diversion hole tilted toward the input end of the first diversion pipe and the output end of the diversion hole tilted toward the output end of the first diversion pipe.

[0018] To better realize this utility model, the stirring structure further includes a first motor, which is fixedly connected to a second motor mounting base on one end face of the first motor mounting base. The output end of the first motor extends vertically downward through the shaft hole and is fixedly connected to the crank. The end of the crank is provided with a rotating shaft seat, and the rotating shaft seat is provided with a vertical mounting hole.

[0019] A rotating shaft is fitted onto the vertical mounting hole via an angular contact ball bearing. The top of the rotating shaft extends upward through an annular gap between the inner circumferential wall of the circular window and the outer circumferential wall of the disc, and is connected to the second motor. The bottom of the rotating shaft extends downward into the additive liquid tank, and a stirring blade is provided on the portion of the rotating shaft located inside the additive liquid tank. The stirring blade is wavy.

[0020] A second connecting rod is provided on the side wall of the second motor. A T-shaped guide block is provided at the top of the second connecting rod. The support frame is shaped like a gate. Multiple support rods are provided on the lower surface of the support frame. An annular support seat is provided at the end of the support rod. The first connecting rod is located inside the annular support seat. A T-shaped guide groove in the shape of a ring is opened at the annular bottom of the annular support seat. The T-shaped guide block slides in conjunction with the T-shaped guide groove.

[0021] The technical solution provided by this utility model has the following advantages compared with the prior art:

[0022] 1. In this invention, the stirring structure is driven by two motors. The first motor drives the entire stirring assembly to rotate within the additive liquid tank, while the second motor drives the rotating shaft and stirring blades to rotate, achieving both revolution and rotation of the additive liquid. Compared to traditional stirring methods, this improves mixing uniformity and ensures stable additive liquid performance. The diversion holes are arranged at an angle, allowing the additive liquid to be injected tangentially into the first diversion pipe, forming a vortex with the fracturing fluid and enhancing mixing efficiency. Compared to a directly vertical arrangement, this shortens mixing time and effectively improves operational efficiency.

[0023] In this invention, multiple sets of interconnected components are arranged at equal intervals along the length of the first diversion pipe, so that the additive liquid is injected in segments along the flow direction of the fracturing fluid. By using flow meters and valves installed on each diversion branch pipe, the injection volume of the additive liquid can be precisely controlled, and the ratio accuracy error can be controlled within ±5%, avoiding resource waste and ensuring that the fracturing operation achieves the best results.

[0024] 3. In this utility model, by observing the flow meters and corresponding valves on each pipeline, the operator can conveniently adjust the first valve, the second valve, the third valve and the fourth valve, thereby flexibly controlling the amount of fracturing fluid delivered to the formation fractures to meet the needs of different geological conditions and fracturing operations. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0027] Figure 2 for Figure 1 The front view;

[0028] Figure 3 for Figure 1 Top view;

[0029] Figure 4 for Figure 1 A partial view;

[0030] Figure 5 This is a schematic diagram showing the assembly of the base plate, fracturing fluid tank, and additive fluid tank.

[0031] Figure 6 for Figure 5 A half-section view;

[0032] Figure 7 This is a schematic diagram of the hybrid output structure;

[0033] Figure 8 for Figure 7 A half-section view;

[0034] Figure 9 for Figure 8 Enlarged view of point A in the middle;

[0035] Figure 10 This is a schematic diagram of the stirring structure;

[0036] Figure 11 for Figure 10 Sectional view at point BB;

[0037] Figure 12 for Figure 10 Rear view.

[0038] Explanation of reference numerals in the attached drawings: 101-Base plate; 102-Fracturing fluid tank; 103-Fracturing fluid inlet; 104-Fracturing fluid outlet; 105-Additive fluid tank; 106-Circular window; 107-Disc; 108-Support frame; 109-First connecting rod; 110-Shaft hole; 111-First motor mounting base; 112-Additive fluid inlet; 113-Additive fluid outlet; 201-Fracturing fluid main pipeline; 202-First fracturing pump; 203-First diversion pipeline; 204-First flow meter; 205-Casing; 206 - Additive liquid main pipeline; 207- Second fracturing pump; 208- Second branch pipeline; 209- First branch pipe; 210- Second branch pipe; 211- Third branch pipe; 212- Second flow meter; 2031- Branch orifice; 2051- Annular branch cavity; 301- First motor; 302- Crank rod; 303- Shaft seat; 304- Shaft; 305- Second motor; 306- Second connecting rod; 307- Annular support seat; 308- Support rod; 309- Stirring blade; 3071- T-shaped guide groove. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the description of this application, it should be noted that the use of terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These terms are used solely for the convenience of describing this application and for 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 application. Furthermore, the use of terms such as "first" and "second" in the description of this application is only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0043] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this application does not imply that the component is required to be absolutely horizontal or suspended, but rather that it may be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but rather that it may be slightly tilted.

[0044] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] Example 1

[0046] like Figures 1 to 12 As shown, a fracturing additive pumping device includes a base plate 101. A fracturing fluid tank 102 and an additive liquid tank 105 are provided on the upper surface of the base plate 101. A fracturing fluid inlet 103 is provided on the top surface of the fracturing fluid tank 102, and a fracturing fluid outlet 104 is provided on the bottom side wall of the fracturing fluid tank 102.

[0047] The top surface of the additive liquid tank 105 is provided with an additive liquid inlet 112, and the bottom side wall of the additive liquid tank 105 is provided with an additive liquid outlet 113.

[0048] The base plate 101 is provided with a mixing output structure on its upper surface between the fracturing fluid tank 102 and the additive fluid tank 105. The top surface of the additive fluid tank 105 is provided with a stirring structure, and the stirring part of the stirring structure is placed inside the additive fluid tank 105.

[0049] like Figures 1 to 12As shown, in this embodiment, the top surface of the additive liquid tank 105 has a circular window 106, and a disc 107 is arranged inside the circular window 106. A pair of symmetrically arranged support frames 108 are provided on the surface of the additive liquid tank 105 outside the circular window 106. The disc 107 is fixedly connected to the support frame 108 through a first connecting rod 109. A shaft hole 110 is provided at the center of the disc 107. A first motor mounting seat 111 is provided on the surface of the disc 107 outside the shaft hole 110. An additive liquid inlet 112 is provided on the top surface of the additive liquid tank 105 outside the circular window 106, and the additive liquid inlet 112 is located between the two support frames 108.

[0050] like Figures 1 to 12 As shown, in this embodiment, the mixed output structure includes a fracturing fluid main pipeline 201. The input end of the fracturing fluid main pipeline 201 is connected to the fracturing fluid outlet 104. A fourth valve is provided at the input end of the fracturing fluid main pipeline 201. A first fracturing pump 202 is provided at the middle and rear section of the fracturing fluid main pipeline 201. Multiple horizontally arranged first diversion pipelines 203 are vertically connected at the rear section of the fracturing fluid main pipeline 201. A first flow meter 204 is provided at the front section of the first diversion pipeline 203. A first valve is provided at the portion of the first diversion pipeline 203 between the input end of the first diversion pipeline 203 and the first flow meter 204. A sleeve 205 is sleeved on the front and middle section of the first diversion pipeline 203. An annular diversion cavity 2051 is formed between the first diversion pipeline 203 and the sleeve 205. A diversion hole 2031 communicating with the annular diversion cavity 2051 is opened on the first diversion pipeline 203.

[0051] The additive liquid outlet 113 is connected to an additive liquid main pipeline 206. A third valve is provided at the input end of the additive liquid main pipeline 206. A second fracturing pump 207 is provided at the middle and rear section of the additive liquid main pipeline 206. A horizontally arranged second diversion pipeline 208 is vertically connected to the output end of the additive liquid main pipeline 206. The second diversion pipeline 208 is connected to multiple annular diversion chambers 2051 through multiple sets of connecting components.

[0052] like Figures 1 to 12 As shown, in this embodiment, multiple sets of the connecting components are arranged at equal intervals along the length of the first diversion pipe 203;

[0053] Each set of connecting components includes a first branch pipe 209, a second branch pipe 210, and a third branch pipe 211. The input end of the first branch pipe 209 is connected to the second branch pipe 208, and the output end of the first branch pipe 209 is connected to the annular branch cavity 2051. The input end of the second branch pipe 210 is connected to the second branch pipe 208, and the output end of the second branch pipe 210 is connected to the annular branch cavity 2051. The input end of the third branch pipe 211 is connected to the second branch pipe 208, and the output end of the third branch pipe 211 is connected to the annular branch cavity 2051.

[0054] The first branch pipe 209, the second branch pipe 210 and the third branch pipe 211 are each equipped with a second valve and a second flow meter 212 in sequence along the flow direction.

[0055] like Figures 1 to 12 As shown, in this embodiment, the diversion hole 2031 is arranged at an angle, with the input end of the diversion hole 2031 tilted toward the input end of the first diversion pipe 203, and the output end of the diversion hole 2031 tilted toward the output end of the first diversion pipe 203.

[0056] like Figures 1 to 12 As shown, in this embodiment, the stirring structure includes a first motor 301. The first motor 301 is mounted on a second motor mounting base fixedly connected to one end face of the first motor mounting base 111. The output end of the first motor 301 extends vertically downward through the shaft hole 110 and is fixedly connected to the crank 302. The end of the crank 302 is provided with a rotating shaft seat 303, and the rotating shaft seat 303 is provided with a vertical mounting hole.

[0057] A rotating shaft 304 is fitted onto the vertical mounting hole via an angular contact ball bearing. The top of the rotating shaft 304 extends upward through the annular gap between the inner peripheral wall of the circular window 106 and the outer peripheral wall of the disc 107, and is connected to the second motor 305. The bottom of the rotating shaft 304 extends downward into the additive liquid tank 105, and a stirring blade 309 is provided on the portion of the rotating shaft 304 located inside the additive liquid tank 105. The stirring blade 309 is wavy.

[0058] A second connecting rod 306 is provided on the side wall of the second motor 305. A T-shaped guide block is provided at the top of the second connecting rod 306. The support frame 108 is shaped like a gate. Multiple support rods 308 are provided on the lower surface of the support frame 108. An annular support seat 307 is provided at the end of the support rod 308. The first connecting rod 109 is located inside the annular support seat 307. A T-shaped guide groove 3071 in the shape of a ring is opened at the annular bottom of the annular support seat 307. The T-shaped guide block slides in cooperation with the T-shaped guide groove 3071.

[0059] In addition, the inclined diversion orifice 2031 can also arrange the additive liquid in a tangential direction, so that the additive liquid is injected into the first diversion pipe 203 in a tangential direction, forming a vortex with the fracturing fluid, enhancing the mixing efficiency, and reducing the mixing time by 25% compared with the direct vertical arrangement.

[0060] Working principle:

[0061] The existing fracturing fluid is injected into the fracturing fluid tank 102 through the fracturing fluid inlet 103, and the existing additive fluid is injected into the additive fluid tank 105 through the additive fluid inlet 112 (during this process, the third valve and the fourth valve are both closed).

[0062] The operator starts the first motor 301 and the second motor 305. The first motor 301 drives the crank 302, the rotating shaft seat 303, the rotating shaft 304, the second motor 305, and the stirring blade 309 to rotate within the additive liquid tank 105. Simultaneously, the second motor 305 drives the rotating shaft 304 and the stirring blade 309 to rotate on their own axis, thereby achieving uniform mixing of the various additive liquids within the additive liquid tank 105. The dual-motor driven stirring structure (first motor 301 and second motor 305) enables the additive liquid to revolve and rotate, improving the mixing uniformity by 15%.

[0063] Then, the first, second, third, and fourth valves are opened, and the first fracturing pump 202 is started. The existing fracturing fluid flows through the main fracturing fluid pipeline 201 and the first branch pipeline 203. Simultaneously, the second fracturing pump 207 is started, and the existing additive fluid flows through the main additive fluid pipeline 206 and the second branch pipeline 208, then through the first branch pipeline 209, the second branch pipeline 210, and the third branch pipeline 211, respectively, into the corresponding casing 205. Finally, it enters the first branch pipeline 203 through the branch orifice 2031, thus ensuring sufficient contact between the existing fracturing fluid and the existing additive fluid. Multiple sets of equally spaced connecting components allow the additive fluid to be injected in segments along the fracturing fluid flow direction, and the mixing ratio accuracy error can be controlled within ±5%.

[0064] In use, the output ends of multiple first diversion pipes 203 will fully contact the existing fracturing fluid and the existing additive fluid and conduct them to multiple fractures extruded in the formation through the existing injection pipes, so as to help improve the formation's permeability, etc.

[0065] By observing the flow meter and corresponding valves, and by adjusting the first, second, third, and fourth valves, the amount of fracturing fluid delivered to the formation fractures (fully contacting the existing fracturing fluid and existing additive fluid) can be easily adjusted.

[0066] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An additive pumping device for fracturing, characterized by: Includes a base plate (101) and a crank (302). The upper surface of the base plate (101) is provided with a fracturing fluid tank (102) and an additive liquid tank (105). The top surface of the fracturing fluid tank (102) is provided with a fracturing fluid inlet (103), and the bottom side wall of the fracturing fluid tank (102) is provided with a fracturing fluid outlet (104). The top surface of the additive liquid tank (105) is provided with an additive liquid inlet (112), and the bottom side wall of the additive liquid tank (105) is provided with an additive liquid outlet (113). The bottom plate (101) is provided with a mixing output structure on its upper surface between the fracturing fluid tank (102) and the additive fluid tank (105). The top surface of the additive fluid tank (105) is provided with a stirring structure, and the stirring part of the stirring structure is placed inside the additive fluid tank (105).

2. An additive pumping device for fracturing according to claim 1, characterized in that: The top surface of the additive liquid tank (105) is provided with a circular window (106), and a disc (107) is arranged inside the circular window (106). A pair of symmetrically arranged support frames (108) are provided on the surface of the additive liquid tank (105) located outside the circular window (106). The disc (107) is fixedly connected to the support frame (108) through a first connecting rod (109). A shaft hole (110) is provided at the center of the disc (107). A first motor mounting seat (111) is provided on the surface of the disc (107) located outside the shaft hole (110). An additive liquid inlet (112) is provided on the top surface of the additive liquid tank (105) located outside the circular window (106), and the additive liquid inlet (112) is located between the two support frames (108).

3. An additive pumping device for fracturing according to claim 2, characterized in that: The mixed output structure includes a fracturing fluid main pipeline (201), the input end of which is connected to the fracturing fluid outlet (104). A fourth valve is provided at the input end of the fracturing fluid main pipeline (201). A first fracturing pump (202) is provided at the middle and rear section of the fracturing fluid main pipeline (201). Multiple horizontally arranged first branch pipelines (203) are vertically connected to the rear section of the fracturing fluid main pipeline (201). A first branch pipeline (203) is provided at the front section of the first branch pipeline (203). A first flow meter (204) is provided. A first valve is provided on the part of the first diversion pipe (203) between the input end of the first diversion pipe (203) and the first flow meter (204). A sleeve (205) is provided on the outside of the front middle section of the first diversion pipe (203). An annular diversion cavity (2051) is formed between the first diversion pipe (203) and the sleeve (205). A diversion hole (2031) communicating with the annular diversion cavity (2051) is provided on the first diversion pipe (203). The additive liquid outlet (113) is connected to an additive liquid main pipeline (206). A third valve is provided at the input end of the additive liquid main pipeline (206). A second fracturing pump (207) is provided at the middle and rear section of the additive liquid main pipeline (206). A horizontally arranged second diversion pipeline (208) is vertically connected to the output end of the additive liquid main pipeline (206). The second diversion pipeline (208) is connected to multiple annular diversion chambers (2051) through multiple sets of connecting components.

4. An additive pumping device for fracturing according to claim 3, characterized in that: Multiple sets of the connecting components are arranged at equal intervals along the length of the first diversion pipe (203); Each set of the connecting components includes a first branch pipe (209), a second branch pipe (210), and a third branch pipe (211). The input end of the first branch pipe (209) is connected to the second branch pipe (208), and the output end of the first branch pipe (209) is connected to the annular branch cavity (2051). The input end of the second branch pipe (210) is connected to the second branch pipe (208), and the output end of the second branch pipe (210) is connected to the annular branch cavity (2051). The input end of the third branch pipe (211) is connected to the second branch pipe (208), and the output end of the third branch pipe (211) is connected to the annular branch cavity (2051). The first branch pipe (209), the second branch pipe (210) and the third branch pipe (211) are each equipped with a second valve and a second flow meter (212) in sequence along the flow direction.

5. An additive pumping device for fracturing according to claim 4, characterized in that: The diversion orifice (2031) is arranged at an angle, with the input end of the diversion orifice (2031) tilted toward the input end of the first diversion pipe (203) and the output end of the diversion orifice (2031) tilted toward the output end of the first diversion pipe (203).

6. An additive pumping device for fracturing according to claim 2 or 5, characterized in that: The stirring structure includes a first motor (301), which is fixedly connected to a second motor mounting base on one end face of the first motor mounting base (111). The output end of the first motor (301) extends vertically downward through the shaft hole (110) and is fixedly connected to the crank (302). The end of the crank (302) is provided with a rotating shaft seat (303), and the rotating shaft seat (303) is provided with a vertical mounting hole. A rotating shaft (304) is fitted onto the vertical mounting hole via an angular contact ball bearing. The top of the rotating shaft (304) extends upward through the annular gap between the inner peripheral wall of the circular window (106) and the outer peripheral wall of the disc (107), and is connected to the second motor (305). The bottom of the rotating shaft (304) extends downward into the additive liquid tank (105), and a stirring blade (309) is provided on the portion of the rotating shaft (304) located inside the additive liquid tank (105). The stirring blade (309) is wavy. A second connecting rod (306) is provided on the side wall of the second motor (305). A T-shaped guide block is provided at the top of the second connecting rod (306). The support frame (108) is shaped like a door. Multiple support rods (308) are provided on the lower surface of the support frame (108). An annular support seat (307) is provided at the end of the support rod (308). The first connecting rod (109) is located inside the annular support seat (307). A T-shaped guide groove (3071) in the shape of a ring is opened at the annular bottom of the annular support seat (307). The T-shaped guide block slides in cooperation with the T-shaped guide groove (3071).

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