Zinc-containing dust sludge solid waste treatment device

Abstract

The utility model discloses a zinc-containing dust sludge solid waste treatment device which comprises a dosing device and a mixing and separating device, and the dosing device is arranged above the mixing and separating device and is connected with the mixing and separating device through a dosing pipeline; the chemical adding device further comprises chemical pipes and a chemical mixing box, and the chemical pipes are arranged on the two sides of the chemical mixing box for preventing chemical pollution; the mixing and separating device further comprises a stirring tank and a temporary storage device. The stirring tank which is better in stirring effect and can be automatically cleaned is arranged on the left side of the temporary storage device with the primary filtering effect and connected with the temporary storage device through a pipeline. According to the utility model, an isolation structure is added when medicaments are mixed, so that the medicament pollution is prevented, and the mixing effect is improved; the stirring mode is improved, all materials are stirred, automatic cleaning can be carried out in cooperation with medicament feeding, and the working efficiency is improved; and a caching function is added, primary separation is carried out while materials are cached, and the reliability and the working efficiency of the device are improved.

Description

Technical Field

[0001] This utility model belongs to the field of metallurgical equipment technology, and in particular relates to a device for treating zinc-containing dust and sludge solid waste. Background Technology

[0002] In the zinc metal industrial production, a lot of zinc-containing solid waste is generated. Currently, two processes are commonly used to treat and recycle these zinc-containing solid wastes: wet treatment and pyrometallurgical treatment. In the wet treatment process, a reagent is usually added to the zinc-containing solid waste to extract the zinc from the solid waste, and then the zinc-containing solution produced by electrolysis is used to recover the zinc metal.

[0003] A prior art device for treating iron- and zinc-containing dust and sludge solid waste, such as the one disclosed in Chinese Patent (CN217699203U), includes a base, a reaction tank mounted on the base, a support pipe fixed on the base, a mixing pipe connected to the support pipe, and at least two agent pipes and one liquid inlet pipe connected to the mixing pipe. The agent pipes are equipped with solenoid valves and flow sensors. The liquid inlet pipe is connected to the dosing pipe of the reaction tank and is equipped with a main valve. The reaction tank includes a tank body, with the dosing pipe located at the upper end of the tank body and a stirring motor located at the lower end. The output end of the stirring motor is connected to a stirring shaft, a portion of which is located within the tank body. A stirring blade is connected to the portion of the stirring shaft located within the tank body. A discharge assembly is located at the lower end of the tank body.

[0004] This approach has the following drawbacks:

[0005] 1. The agents are automatically mixed by being delivered from their respective agent tubes into the three-way structure below. During the mixing process, there is a lack of isolation measures, and the agents can diffuse from the mixing structure into different agent tubes, posing a risk of agent contamination.

[0006] 2. The material at the bottom of the mixing container is not subjected to the action of the mixing mechanism, so it cannot be fully mixed, resulting in poor mixing effect. In addition, the container cannot be automatically cleaned after use, resulting in low work efficiency.

[0007] 3. After the device mixes solid waste materials, it directly sends the materials to the next process. If the subsequent process is interrupted due to maintenance, the device will not be able to continue to transport materials and will also have to stop operating, affecting production efficiency. This shows that the device lacks a material buffering function and has low reliability.

[0008] Therefore, this paper provides a device for treating zinc-containing dust and sludge solid waste. Utility Model Content

[0009] To address the aforementioned technical problems, this utility model discloses a zinc-containing dust and sludge solid waste disposal device. It adds an isolation structure during reagent mixing to prevent reagent contamination while improving the mixing effect; it improves the stirring method, ensuring all materials inside the mixing container are stirred, and also allows for automatic cleaning in conjunction with reagent feeding, thus increasing work efficiency; and it adds a buffering function to buffer materials while performing primary separation, improving the device's reliability and work efficiency.

[0010] To achieve the above-mentioned technical effects, this utility model provides a zinc-containing dust and sludge solid waste treatment device, including a dosing device and a mixing and separation device. The dosing device is located above the mixing and separation device and is connected to the mixing and separation device through a dosing pipe. The dosing device also includes a reagent pipe and a mixing tank. The reagent pipe is located on both sides of the mixing tank to prevent reagent contamination. The mixing and separation device also includes a stirring tank and a buffer device. The stirring tank, which has a better stirring effect and can be automatically cleaned, is located to the left of the buffer device, which has a primary filtration effect, and is connected to the buffer device through a pipe.

[0011] Preferably, the mixing tank further includes a box body a, a drive motor a, a stirring rod a, and a stirring blade a. The box body a is located in the middle and has an outlet at the bottom that is connected to the dosing pipe. The drive motor a is located above the box body. The stirring rod a is located below the drive motor a and is connected to the output end of the drive motor a. The stirring blade a is located on the stirring rod a.

[0012] Preferably, the mixing tank also includes a tank body b and an outlet located below the tank body b, and the outlet below the tank body b is connected to the dosing pipeline via a confluence of pipes.

[0013] Preferably, the mixing tank further includes a tank body, a flow divider, a drive motor b, a stirring rod b, a spiral blade, and a stirring blade b. The flow divider is located below the inlet on the upper part of the tank body, the drive motor b is located below the tank body, the stirring rod b is located above the drive motor b and connected to the output end of the drive motor b, the spiral blade for lifting the mixed material is located on the side of the stirring rod b, and the stirring blade b for stirring and gathering the material below is located on the lower side of the stirring rod b.

[0014] Preferably, the buffer device further includes a buffer tank, a drain pipe, and a solution pipe. The drain pipe for discharging the lower precipitate is located on the lower left side of the buffer tank, and the solution pipe for discharging the upper solution is located on the upper right side of the buffer tank.

[0015] Preferably, the buffer box is also provided with a transparent observation port on the front side for observing the material separation.

[0016] Preferably, the sewage pipe also includes an electric valve a and a water pump a, with the water pump a located to the left of the electric valve a, and the electric valve a and the water pump a being electrically connected to the workshop control cabinet.

[0017] Preferably, the solution pipeline also includes a float, a hose, an electric valve b, and a water pump b. The float is located inside the buffer tank, and the lower end of the float is connected to the left inlet of the solution pipeline via a hose. The electric valve b is located on the right side of the solution pipeline, and the water pump b is located on the right side of the electric valve b. The electric valve b and the water pump b are electrically connected to the workshop control cabinet.

[0018] Preferably, the float further includes a cavity and a water inlet hole, with the cavity providing buoyancy to the float located on the upper part of the float and the water inlet hole located on the lower side of the float.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] The device employs a mixing tank, which adds an isolation structure during drug mixing to prevent drug contamination and improve the mixing effect; the mixing tank improves the mixing method, mixing all materials inside the mixing container, and can also automatically clean the device in conjunction with drug feeding, improving work efficiency; the buffer device adds a buffering function, buffering materials while performing primary separation, improving the reliability and work efficiency of the device. Attached Figure Description

[0021] Figure 1 This is a front view of Embodiment 1 of this utility model;

[0022] Figure 2 This is a left view of the present invention;

[0023] Figure 3 yes Figure 2 A sectional view along section a.

[0024] Figure 4 yes Figure 3 A partial schematic diagram of b in the middle;

[0025] Figure 5 This is a front view of Embodiment 2 of this utility model;

[0026] Figure 6 This is a schematic diagram of the dosing device in Embodiment 2 of this utility model;

[0027] Figure 7 This is a schematic diagram of the cache device in this utility model;

[0028] The attached diagram lists the components represented by each number as follows:

[0029] 1. Dosing device; 2. Mixing and separating device; 3. Dosing pipeline; 4. Chemical pipeline; 5. Mixing tank; 6. Mixing tank; 7. Buffer device; 8. Box a; 9. Drive motor a; 10. Stirring rod a; 11. Stirring blade a; 12. Box b; 13. Tank; 14. Diverter hood; 15. Drive motor b; 16. Stirring rod b; 17. Spiral blade; 18. Stirring blade b; 19. Buffer tank; 20. Drainage pipeline; 21. Solution pipeline; 22. Observation port; 23. Electric valve a; 24. Water pump a; 25. Hose; 26. Electric valve b; 27. Water pump b; 28. Cavity; 29. ​​Water inlet. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0031] like Figures 1 to 7 As shown, the prior art in this embodiment has the following problems: The inventors have discovered the following defects in the prior art:

[0032] 1. The agents are automatically mixed by being delivered from their respective agent tubes into the three-way structure below. During the mixing process, there is a lack of isolation measures, and the agents can diffuse from the mixing structure into different agent tubes, posing a risk of agent contamination.

[0033] 2. The material at the bottom of the mixing container is not subjected to the action of the mixing mechanism, so it cannot be fully mixed, resulting in poor mixing effect. In addition, the container cannot be automatically cleaned after use, resulting in low work efficiency.

[0034] 3. After the device mixes solid waste materials, it directly sends the materials to the next process. If the subsequent process is interrupted due to maintenance, the device will not be able to continue to transport materials and will also have to stop operating, affecting production efficiency. This shows that the device lacks a material buffering function and has low reliability.

[0035] Therefore, the inventor provides a zinc-containing dust and sludge solid waste disposal device, including a dosing device 1 and a mixing and separation device 2. The dosing device 1 is located above the mixing and separation device 2 and is connected to the mixing and separation device 2 through a dosing pipe 3. The dosing device 1 also includes a reagent pipe 4 and a mixing tank 5. The reagent pipe 4 is located on both sides of the mixing tank 5 to prevent reagent contamination. The mixing and separation device 2 also includes a stirring tank 6 and a buffer device 7. The stirring tank 6, which has a better stirring effect and can be automatically cleaned, is located to the left of the buffer device 7, which has a primary filtration effect, and is connected to the buffer device 7 through a pipe.

[0036] Using the above scheme, different reagents enter the mixing tank 5 from the reagent pipe 4 and mix. During the mixing process, the different reagents come into contact in the mixing tank 5, and there is no problem of contamination between different reagents. After mixing, the reagents enter the mixing tank 6 through the dosing pipe 3 and fall down the side wall of the mixing tank 6 to the bottom of the mixing tank 6. They mix with the solid waste material input from the side under the action of the mixing tank 6. During the mixing process, the material is continuously gathered from both sides to the middle, and then continuously lifted and mixed from the middle, mixing all the materials inside the mixing container. After mixing, the material is discharged from the bottom into the buffer device 7. At this time, the remaining reagents can slide down the inner wall of the mixing tank 6, which, together with the mixing of the mixing tank 6, completes the automatic cleaning of the inner wall of the mixing tank 6, improving work efficiency. After the material enters the buffer device 7, the zinc-containing solution and precipitate are separated through precipitation. They can be discharged to the next processing step through the buffer device 7. The buffer device 7 performs primary separation while buffering the material, improving the reliability and work efficiency of the device.

[0037] Furthermore, the mixing tank 6 also includes a tank body 13, a flow divider 14, a drive motor b15, a stirring rod b16, a spiral blade 17, and a stirring blade b18. The flow divider 14 is located above the inlet of the tank body 13, the drive motor b15 is located below the tank body 13, the stirring rod b16 is located above the drive motor b15 and connected to the output end of the drive motor b15, the spiral blade 17 for lifting the mixed material is located on the side of the stirring rod b16, and the stirring blade b18 for stirring and gathering the material below is located on the lower side of the stirring rod b16.

[0038] The mixed reagent enters from the top of the tank 13, falls onto the diversion hood 14, and is diverted by the diversion hood 14 to the inner wall of the tank 13, flowing down evenly along the inner wall. Solid waste enters from the side of the tank 13, and begins to mix with the reagent at the bottom of the mixing tank 6. The drive motor a9 drives the stirring rod b16 to rotate, thereby causing the stirring blades b18 on the stirring rod to initially mix the reagent and the material. Since the bottom of the tank 13 is conical, the material gradually gathers towards the middle of the tank 13 during the stirring process of the stirring blades b18, and converges into the cavity 28 at the bottom of the tank 13. The material is lifted upwards by the spiral blade 17, and after reaching the highest point, it falls back to the bottom of the tank 13. Under the stirring of the stirring blade b18, it gathers back into the middle of the tank 13, thus continuously circulating and completing the mixing of the agent and solid waste. This method stirs all the materials inside the mixing container. After the material is fully stirred and discharged downwards, the mixed agent can be added again. The agent flows down along the inner wall, which plays a role in scrubbing the inner wall of the tank 13. Combined with the rotation of the spiral blade 17 and the stirring blade b18, the automatic cleaning function of the device is completed.

[0039] Furthermore, the buffer device 7 also includes a buffer tank 19, a drain pipe 20, and a solution pipe 21. The drain pipe 20, which discharges the lower sediment, is located on the lower left side of the buffer tank 19, and the solution pipe 21, which discharges the upper solution, is located on the upper right side of the buffer tank 19.

[0040] After mixing, the material is discharged from the mixing tank 6 into the buffer tank 19 through a pipeline. After the sediment is stored in the buffer tank 19, the upper zinc-containing solution and the lower sediment are separated. The sediment is discharged through the drain pipe 20, and the zinc-containing solution is extracted through the solution pipe 21. The buffer device 7 adds a buffer function and can also perform primary separation of materials, thereby improving the reliability and working efficiency of the device.

[0041] Furthermore, a transparent observation port 22 for observing the material separation is provided on the front side of the buffer box 19;

[0042] Among them, the observation port 22 allows production personnel to easily observe the sedimentation and separation of materials, and also allows them to observe the discharge of materials from the buffer tank 19 when materials are discharged.

[0043] Furthermore, the sewage pipe 20 also includes an electric valve a23 and a water pump a24. The water pump a24 is located to the left of the electric valve a23. The electric valve a23 and the water pump a24 are electrically connected to the workshop control cabinet.

[0044] Among them, electric valve a23 controls the opening and closing of the pipeline, and water pump a24 provides power to the pipeline.

[0045] Furthermore, the solution pipeline 21 also includes a float, a hose 25, an electric valve b26, and a water pump b27. The float is installed inside the buffer tank 19, and the lower end of the float is connected to the left inlet of the solution pipeline 21 via the hose 25. The electric valve b26 is installed on the right side of the solution pipeline 21, and the water pump b27 is installed on the right side of the electric valve b26. The electric valve b26 and the water pump b27 are electrically connected to the workshop control cabinet.

[0046] Among them, electric valve b26 controls the opening and closing of the pipeline, water pump b27 provides power to the device, float floats on the liquid surface, and hose 25 ensures that solution pipeline 21 can draw zinc-containing solution from the upper layer.

[0047] Furthermore, the float also includes a cavity 28 and a water inlet 29. The cavity 28, which provides buoyancy to the float, is located on the upper part of the float, and the water inlet 29 is located on the lower side of the float.

[0048] The cavity 28 ensures that the float floats stably on the liquid surface, and the water inlet 29 allows the zinc-containing solution to be drawn into the solution pipe 21 from below. Example 1

[0049] like Figures 1 to 4 As shown:

[0050] Furthermore, the mixing tank 5 also includes a tank body a8, a drive motor a9, a stirring rod a10, and a stirring blade a11. The tank body a8 is located in the middle and has an outlet at the bottom that is connected to the dosing pipe 3. The drive motor a9 is located above the tank body. The stirring rod a10 is located below the drive motor a9 and is connected to the output end of the drive motor a9. The stirring blade a11 is located on the stirring rod a10.

[0051] In this embodiment, the agents enter the box a8 through several pipes set on the side of the box a8. Taking two agents as an example, in the box a8, the drive motor a9 drives the stirring rod a10 to rotate, so that the stirring blade a11 rotates to mix the agents. After the agents are fully mixed, they are discharged into the mixing tank 6 through the dosing pipe 3 set at the bottom of the box a8. This method of adding the agents first and then stirring ensures that the agents will not contaminate each other, while improving the mixing effect of the agents by adding a stirring device. Example 2

[0052] like Figures 5 to 6 As shown:

[0053] Furthermore, the mixing tank 5 also includes a tank body b12 and an outlet located below the tank body b12, and the outlet below the tank body b12 is connected to the dosing pipe 3 via a pipe.

[0054] In this embodiment, the agents enter the box b12 through several pipes installed on the side of the box b12. In this embodiment, two agents are used as an example. The agents are added to the box b12 through different pipes. During the dosing process, the fluid flow completes the initial mixing in the box a8. After the dosing is completed, the initially mixed agents flow down through several pipes installed at the bottom of the box b12. In this embodiment, two pipes are used as an example. Finally, they converge into the dosing pipe 3 to complete the further mixing. This method also ensures that the agents do not contaminate each other, while improving the mixing effect of the agents by strengthening the flow of the agents, and does not require additional power to the mixing tank 5.

[0055] In summary, the device employs a mixing tank 5, which adds an isolation structure during drug mixing, preventing drug contamination while improving the mixing effect; the mixing tank 6 improves the mixing method, mixing all materials inside the mixing container, and can also automatically clean the device in conjunction with drug feeding; the buffer device 7 adds a buffering function, buffering materials while performing primary separation, thus improving the reliability and working efficiency of the device.

[0056] The working principle of this utility model:

[0057] In Example 1, the agents enter the box a8 through pipes provided on the side of the box a8. Inside the box a8, the drive motor a9 drives the stirring rod a10 to rotate, causing the stirring blades a11 to rotate and mix the agents. After the agents are fully mixed, they are discharged into the mixing tank 6 through the dosing pipe 3 provided at the bottom of the box a8. This method ensures that the agents do not contaminate each other, while improving the mixing effect of the agents by adding a stirring device.

[0058] In Example 2, the agents enter the box b12 from the pipes set on the side of the box b12. During the dosing process, the fluid flow completes the initial mixing in the box a8. After the dosing is completed, the initially mixed agents flow down through several pipes set at the bottom of the box b12. In this example, two pipes are used as examples. Finally, they converge into the dosing pipe 3 to complete the further mixing. This method improves the mixing effect of the agents by strengthening the flow of the agents, and does not require additional power to the mixing box 5.

[0059] The above two methods prevent contamination of the drug source when the drugs are mixed directly through the pipeline by adding a transition mixing device in the four channels of different drugs, and enhance the mixing effect of the drugs in different ways.

[0060] The mixed reagent enters from the top of tank 13, falls onto the diversion hood 14, and is diverted by the diversion hood 14 to the inner wall of tank 13, flowing down evenly along the inner wall. Solid waste enters from the side of tank 13, and begins to mix with the reagent at the bottom of the mixing tank 6. The drive motor a9 drives the stirring rod b16 to rotate, thereby causing the stirring blades b18 on the stirring rod to initially stir the reagent and materials. Since the bottom of tank 13 is conical, the materials gradually gather towards the middle of tank 13 during the stirring process of the stirring blades b18, and converge into the cavity 28 below tank 13. The material is lifted upwards by the spiral blades 17, and after reaching its highest point, it falls back to the bottom of the tank 13. Under the agitation of the stirring blades b18, it re-collects in the middle of the tank 13, thus continuously circulating and completing the mixing of the reagent and solid waste. This method mixes all the materials inside the mixing container. After the material is fully mixed and discharged downwards, more mixed reagent can be added. The reagent flows down the inner wall, effectively scrubbing the inner wall of the tank 13. Combined with the rotation of the spiral blades 17 and b18, this completes the automatic cleaning function of the device, improving work efficiency.

[0061] After mixing, the material is discharged from the mixing tank 6 into the buffer tank 19 via a pipeline. In the buffer tank 19, the sediment is stored and separated into an upper layer of zinc-containing solution and a lower layer of precipitate. When the production personnel observe the sediment stratification through the observation port 22, they can control the electric valve b26 and water pump b27 to open. The upper layer of zinc-containing solution is discharged through a float floating on the liquid surface. Water pump b27 pumps the solution into the water inlet 29 below the float, through the hose 25, and then out through the solution pipeline 21. During this process, the cavity 28 inside the float ensures that the float can float stably on the liquid surface. With hose 25 in place, the float descends continuously as the zinc solution is pumped out until all the upper layer solution is discharged. At this point, electric valve b26 and water pump b27 are closed, while electric valve a23 and water pump a24 are opened. Water pump b27 pumps the lower layer of sediment into the system, which is then transported to the next process via drain pipe 20. After the transport is completed, electric valve a23 and water pump a24 return to the closed state, and buffer tank 19 receives the mixed material from mixing tank 6 again. Buffer device 7 adds a buffering function and can also perform primary separation of materials, improving the reliability and efficiency of the device.

[0062] This concludes the description of the working principle of the device.

[0063] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0064] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for treating zinc-containing dust and sludge solid waste, comprising a dosing device (1) and a mixing and separating device (2), wherein the dosing device (1) is disposed above the mixing and separating device (2) and is connected to the mixing and separating device (2) via a dosing pipe (3), characterized in that: The dosing device (1) also includes a drug tube (4) and a mixing tank (5). The drug tube (4) is set on both sides of the mixing tank (5) to prevent drug contamination. The mixing and separation device (2) also includes a stirring tank (6) and a buffer device (7). The stirring tank (6), which has a better stirring effect and can be automatically cleaned, is set on the left side of the buffer device (7) with a primary filtration effect and is connected to the buffer device (7) through a pipe.

2. The zinc-containing dust and sludge solid waste disposal device according to claim 1, characterized in that: The mixing tank (5) also includes a tank body a (8), a drive motor a (9), a stirring rod a (10), and a stirring blade a (11). The tank body a (8) is located in the middle and has an outlet at the bottom that is connected to the dosing pipe (3). The drive motor a (9) is located above the tank body. The stirring rod a (10) is located below the drive motor a (9) and is connected to the output end of the drive motor a (9). The stirring blade a (11) is located on the stirring rod a (10).

3. The zinc-containing dust and sludge solid waste disposal device according to claim 1, characterized in that: The mixing tank (5) also includes a tank body b (12) and an outlet located below the tank body b (12), and the outlet below the tank body b (12) is connected to the dosing pipe (3) through a pipe.

4. The zinc-containing dust and sludge solid waste disposal device according to claim 1, characterized in that: The mixing tank (6) also includes a tank body (13), a flow divider (14), a drive motor b (15), a stirring rod b (16), a spiral blade (17), and a stirring blade b (18). The flow divider (14) is located above the inlet of the tank body (13), the drive motor b (15) is located below the tank body (13), the stirring rod b (16) is located above the drive motor b (15) and connected to the output end of the drive motor b (15), the spiral blade (17) for lifting the mixed material is located on the side of the stirring rod b (16), and the stirring blade b (18) for stirring and gathering the material below is located on the lower side of the stirring rod b (16).

5. The zinc-containing dust and sludge solid waste disposal device according to claim 1, characterized in that: The buffer device (7) further includes a buffer tank (19), a drain pipe (20), and a solution pipe (21). The drain pipe (20) for discharging the lower sediment is located on the lower left side of the buffer tank (19), and the solution pipe (21) for discharging the upper solution is located on the upper right side of the buffer tank (19).

6. The zinc-containing dust and sludge solid waste disposal device according to claim 5, characterized in that: The buffer box (19) is also provided with a transparent observation port (22) on the front side for observing the material separation.

7. The zinc-containing dust and sludge solid waste disposal device according to claim 5, characterized in that: The sewage pipe (20) also includes an electric valve a (23) and a water pump a (24). The water pump a (24) is located to the left of the electric valve a (23). The electric valve a (23) and the water pump a (24) are electrically connected to the workshop control cabinet.

8. The zinc-containing dust and sludge solid waste disposal device according to claim 5, characterized in that: The solution pipeline (21) also includes a float, a hose (25), an electric valve b (26), and a water pump b (27). The float is located inside the buffer tank (19). The lower end of the float is connected to the left inlet of the solution pipeline (21) via a hose (25). The electric valve b (26) is located on the right side of the solution pipeline (21). The water pump b (27) is located on the right side of the electric valve b (26). The electric valve b (26) and the water pump b (27) are electrically connected to the workshop control cabinet.

9. The zinc-containing dust and sludge solid waste disposal device according to claim 8, characterized in that: The float also includes a cavity (28) and a water inlet (29). The cavity (28) that provides buoyancy to the float is located on the upper part of the float, and the water inlet (29) is located on the lower side of the float.

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