High-efficiency bubble scraping flotation machine and bubble scraping mechanism thereof

Abstract

The application relates to the field of flotation froth scraping technology, and specifically discloses a high-efficiency froth scraping flotation machine and a froth scraping mechanism thereof, wherein the froth scraping mechanism of the high-efficiency froth scraping flotation machine comprises a speed reducer, a speed reducer rack, a large synchronous pulley, a small synchronous pulley, a synchronous belt, a UCP bearing seat, a spoke, a scraper shaft and a middle bearing body, wherein the speed reducer is located at one end of a flotation tank, the speed reducer is fixedly connected to the speed reducer rack, and the speed reducer rack is fixedly connected to a top frame of the flotation tank; the small synchronous pulley is fixedly connected to an output shaft of the speed reducer through a key, the large synchronous pulley is fixedly connected to one end of the scraper shaft through a key, and the large synchronous pulley is engaged with the small synchronous pulley through the synchronous belt; two scraper shafts are arranged on the front and back sides of each flotation tank, the scraper shafts span the width of the flotation tank, the two ends of the scraper shafts are supported through the UCP bearing seat, and the middle part is supported through the middle bearing body; the scraper shafts are parallel to overflow weirs of the flotation tank and are located above froth tanks.

Description

Technical Field

[0001] This application relates to the field of flotation foam removal technology, specifically to a high-efficiency flotation machine with foam removal mechanism. Background Technology

[0002] Flotation is a crucial separation method in mineral processing. Its basic principle is to utilize the differences in the physicochemical properties of mineral surfaces. Target minerals (useful minerals) are carried from the slurry to the surface by air bubbles, forming a froth layer. The froth is then scraped off by a scraper device, yielding the concentrate product. The flotation machine is the core industrial equipment for realizing this process.

[0003] In existing technologies, most mechanically agitated flotation machines employ a single-sided froth scraping design. This means that an overflow weir is installed on one side wall of the flotation cell, along with a scraper drive. Through periodic rotation, the foam accumulated near the overflow weir is scraped into the froth tank. However, this traditional single-sided, single-scraper design has significant limitations: because only one scraper operates on one side, the number of froth scraping operations per unit time is limited. When processing large quantities or easily foaming slurries, the froth scraping rate cannot keep up with the froth generation rate.

[0004] Therefore, there is an urgent need in this field for a new type of frothing device that can significantly improve frothing efficiency and flotation machine processing capacity without sacrificing concentrate quality. Summary of the Invention

[0005] The purpose of this application is to provide a high-efficiency flotation machine with a skimming mechanism to solve the problems in the prior art.

[0006] To achieve the above objectives, embodiments of this application provide a frothing mechanism for a high-efficiency frothing flotation machine, comprising: a reducer, a reducer frame, a large synchronous pulley, a small synchronous pulley, a synchronous belt, a UCP bearing housing, spokes, a scraper shaft, and a central bearing body, wherein... The speed reducer is located at one end of the flotation cell and is fixedly connected to the speed reducer frame, which is fixedly connected to the top frame of the flotation cell. The small synchronous pulley is fixed to the output shaft of the reducer by a key connection, and the large synchronous pulley is fixed to one end of the scraper shaft by a key connection. The large synchronous pulley and the small synchronous pulley are engaged by the synchronous belt. Two scraper shafts are provided on each of the front and rear sides of each flotation cell. The scraper shafts span the width of the flotation cell and are supported at both ends by UCP bearing seats and in the middle by a central bearing body. The scraper shaft is parallel to the overflow weir of the flotation cell and is located above the foam tank.

[0007] Optionally, it also includes: A scraper, the scraper being connected to the scraper shaft via spokes; The spokes are radially mounted arm-shaped structures, with one end fixed to the scraper shaft by a key or bolt, and the other end fitted with a scraper.

[0008] Optionally, multiple spokes and scrapers are installed on each scraper shaft, and the spokes and scrapers are evenly distributed along the length of the scraper shaft.

[0009] Optionally, it also includes: A belt cover, which is bolted to cover the outside of the synchronous belt, the small synchronous pulley, and the large synchronous pulley.

[0010] This application embodiment also provides a flotation machine, including: the aforementioned frothing mechanism, and a first flotation cell, a second flotation cell, a third flotation cell, a feed box, an intermediate box, and a tailings box, wherein, The feed box is located at the left end of the first flotation cell, the second flotation cell is located at the right end of the first flotation cell, the intermediate box is located at the right end of the second flotation cell, the third flotation cell is located at the right end of the intermediate box, and the tailings box is located at the right end of the third flotation cell. The bubble scraping mechanism is located on the front and rear sides above the first flotation cell, the second flotation cell, and the third flotation cell.

[0011] Optionally, the first flotation cell is an XCF type suction cell, the second flotation cell is a KYF type direct current cell, and the third flotation cell is an XCF type suction cell.

[0012] Optionally, both the first flotation cell and the third flotation cell are equipped with side suction pipes, which face the feed box and the intermediate box on the left, respectively.

[0013] Optionally, it also includes: The feed pipe is disposed on the front and rear sides of the first flotation cell and the third flotation cell; Foam tanks are disposed on the front and rear sides of the upper ends of the first flotation cell, the second flotation cell, and the third flotation cell.

[0014] The frothing mechanism of the high-efficiency frothing flotation machine provided in this application embodiment has the following advantages: Significantly improved flotation efficiency: By increasing the number of overflow weirs in the flotation cell from one to two (front and rear), and improving the foam scraping mechanism from a single-sided single-scraper to a double-sided four-scraper structure, the number of foam scraping operations and the amount of foam scraped per unit time are doubled. The foam can be scraped off quickly and promptly, significantly accelerating the flotation rate and improving the overall processing capacity and production efficiency of the flotation machine.

[0015] Effective elimination of foam accumulation: The symmetrically arranged scrapers can simultaneously clean the foam on both sides of the flotation cell, while the increased number of scrapers also strengthens the coverage of the central area of ​​the flotation cell. This design essentially eliminates the "foam dead zone" in traditional designs, solves the technical problem of foam accumulation on the rear and central sides of the flotation cell, and ensures the stability and continuity of the flotation process.

[0016] Improved concentrate grade and recovery rate: Because the foam is scraped off in a timely and uniform manner, the impurities carried in the foam and the minerals falling back due to the foam's prolonged retention and rupture help to improve the grade of the final concentrate product and the recovery rate of useful minerals.

[0017] Enhanced operational flexibility and reduced reagent consumption: Operators no longer need to deliberately reduce the amount of frother to control foam buildup, and can operate at the optimal reagent dosage to fully utilize reagent performance. This not only optimizes flotation parameters but also helps reduce reagent consumption and production costs in the long run.

[0018] Reasonable structure and low modification cost: This solution is an optimization and improvement based on the original flotation machine structure, without the need for radical changes to the main body of the flotation cell, impeller mechanism, and other core components. It can be achieved by adding a symmetrical overflow weir, foam tank, and scraper drive system, resulting in relatively low modification costs, easy upgrading and promotion on existing equipment, and stable and reliable operation. Attached Figure Description

[0019] To more clearly illustrate the embodiments of this application or the technical solutions in 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 merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] Figure 1 A front view of a high-efficiency flotation machine with a frothing scraping mechanism provided for at least one embodiment of this application; Figure 2 A side view of a flotation machine with a high-efficiency flotation machine equipped with a flotation scraping mechanism, provided for at least one embodiment of this application; Figure 3 A top view of a flotation machine with a frothing scraping mechanism provided for at least one embodiment of this application.

[0021] Explanation of reference numerals in the attached figures: 1. Feed box, 2. First flotation cell, 3. Second flotation cell, 4. Intermediate box, 5. Third flotation cell, 6. Tailings box, 7. Scraping mechanism, 8. Reducer frame, 9. Adjustment device, 10. Foam tank, 11. Slurry inlet pipe, 12. Side slurry suction pipe, 13. Large synchronous pulley, 14. Reducer, 15. Belt cover, 16. Small synchronous pulley, 17. Synchronous belt, 18. UCP bearing housing, 19. Scraper shaft, 20. Spokes, 21. Scraper, 22. Central bearing body. Detailed Implementation

[0022] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this application and for simplification, 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 terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0025] This application provides a frothing mechanism for a high-efficiency frothing flotation machine. The frothing mechanism is the core improvement of this application, increasing the number of scraper components (a double-sided four-scraper design) to improve frothing efficiency. The frothing mechanism includes: a reducer 14, a reducer frame 8, an adjusting device 9, a large synchronous pulley 13, a small synchronous pulley 16, a belt cover 15, a synchronous belt 17, a UCP bearing housing 18, scrapers 21, spokes 20, a scraper shaft 19, and a central bearing housing 22. (Reference) Figures 1 to 3 The connection and positional relationships of these components are as follows: Gearbox 14 and gearbox frame 8: The reducer 14 is fixedly connected to the reducer frame 8, which is fixedly connected to the top frame of the flotation cell. The reducer 14 provides power output, with its output shaft facing the scraper shaft 19.

[0026] Positional relationship: The reducer 14 is located on the side above the flotation cell, usually close to one end of the flotation cell, to facilitate transmission.

[0027] Small synchronous pulley 16 and large synchronous pulley 13: The small synchronous pulley 16 is fixed to the output shaft of the reducer 14 by a key connection and rotates with the reducer 14.

[0028] The large synchronous pulley 13 is fixed to one end of the scraper shaft 19 by a key connection and is used to receive power. The large synchronous pulley 13 and the small synchronous pulley 16 are engaged by the synchronous belt 17 to form a belt drive system.

[0029] Positional relationship: The small synchronous pulley 16 and the large synchronous pulley 13 are located in the same vertical plane. The diameter of the large synchronous pulley 13 is larger than that of the small synchronous pulley 16, so as to achieve speed reduction and torque increase.

[0030] Synchronous belt 17 and belt cover 15: The synchronous belt 17 is fitted onto the small synchronous pulley 16 and the large synchronous pulley 13 to transmit power. The tension of the synchronous belt 17 is adjusted by the adjusting device 9.

[0031] The belt cover 15 is bolted to the outside of the synchronous belt 17, the small synchronous pulley 16, and the large synchronous pulley 13 for safety protection and dust prevention.

[0032] Scraper shaft 19 and bearing support: The scraper shaft 19 is a long shaft that spans the width of the flotation cell. Its two ends are supported by UCP bearing seats 18, and its middle is further supported by a central bearing body 22 (to prevent bending if the scraper shaft 19 is long).

[0033] The UCP bearing housing 18 is bolted to a bracket at the top of the flotation cell and is located on the front and rear sides of the flotation cell. Each UCP bearing housing 18 contains a rolling bearing to reduce rotational friction of the scraper shaft 19.

[0034] The central bearing body 22 is fixed above the center of the flotation cell by a bracket to provide additional support and ensure that the scraper shaft 19 rotates smoothly.

[0035] Positional relationship: The scraper shaft 19 is parallel to the overflow weir of the flotation cell, located above the foam tank 10, at a certain height from the overflow weir.

[0036] Scraper 21 and spokes 20: The scraper 21 is connected to the scraper shaft 19 via spokes 20. The spokes 20 are radially mounted arm-shaped structures, with one end fixed to the scraper shaft 19 by a key or bolt, and the other end on which the scraper 21 is mounted. Multiple spokes 20 and scraper 21 are mounted on each scraper shaft 19, evenly distributed along the axial length.

[0037] In some embodiments of the double-sided four-scraper 21 design, two scraper shafts 19 are provided on each of the front and rear sides of each flotation cell, and two scrapers 21 are installed on each scraper shaft 19 (a total of four scrapers 21) to achieve double-sided foam removal. The scrapers 21 are usually made of wear-resistant material and are blade-shaped or plate-shaped.

[0038] Positional relationship: When the scraper 21 rotates with the scraper shaft 19, its blades periodically contact the foam layer, scraping the foam into the foam groove 10. The rotation radius and angle of the scraper 21 are adjustable to ensure efficient foam scraping.

[0039] Adjustment device 9: Adjustment device 9 is installed near the reducer frame 8 or bearing housing 18 to adjust the tension of the timing belt 17 or the position of the scraper shaft 19. For example, the tension of the timing belt 17 can be changed by moving the reducer 14 or bearing housing 18 by adjusting the bolts.

[0040] Positional relationship: The adjusting device 9 is located at a key point in the transmission system, which facilitates operation and maintenance.

[0041] The working process of the foam scraping mechanism 7 is as follows: After the reducer 14 starts, it drives the scraper shaft 19 to rotate through the small synchronous pulley 16, the synchronous belt 17, and the large synchronous pulley 13. The scraper shaft 19 drives the spokes 20 and the scraper 21 to perform periodic circular motion. The scraper 21 scrapes the foam on the surface of the flotation cell into the foam tanks 10 on both the front and rear sides. Due to the double-sided four-scraper 21 design, the number of times foam is scraped per unit time is increased, effectively reducing foam accumulation and improving flotation efficiency.

[0042] Compared with the prior art, the bubble-scraping mechanism 7 provided in this application has the following significant advantages: Significantly improved flotation efficiency: By increasing the number of overflow weirs in the flotation cell from one to two (front and rear), and improving the foam scraping mechanism 7 from a single-sided single-scraper 21 to a double-sided four-scraper 21 structure, the number of foam scrapings and the amount of foam scraped per unit time are doubled. The foam can be scraped off quickly and in a timely manner, significantly accelerating the flotation rate and improving the overall processing capacity and production efficiency of the flotation machine.

[0043] Effective elimination of foam accumulation: The symmetrically arranged scrapers 21 can simultaneously clean the foam on both sides of the flotation cell, while the increased number of scrapers 21 also strengthens the coverage of the central area of ​​the flotation cell. This design basically eliminates the "foam dead zone" in traditional designs, solves the technical problem of foam accumulation on the rear side and in the middle of the flotation cell, and ensures the stability and continuity of the flotation process.

[0044] Improved concentrate grade and recovery rate: Because the foam is scraped off in a timely and uniform manner, the impurities carried in the foam and the minerals falling back due to the foam's prolonged retention and rupture help to improve the grade of the final concentrate product and the recovery rate of useful minerals.

[0045] Enhanced operational flexibility and reduced reagent consumption: Operators no longer need to deliberately reduce the amount of frother to control foam buildup, and can operate at the optimal reagent dosage to fully utilize reagent performance. This not only optimizes flotation parameters but also helps reduce reagent consumption and production costs in the long run.

[0046] Reasonable structure and low modification cost: This solution is an optimization and improvement based on the original flotation machine structure, without the need for radical changes to the main body of the flotation cell, impeller mechanism, and other core components. It can be achieved by adding a symmetrical overflow weir, foam tank 10, and scraper 21 transmission system. The modification cost is relatively low, it is easy to upgrade and promote on existing equipment, and it operates stably and reliably.

[0047] This application embodiment also provides a high-efficiency flotation machine with froth removal, including: the froth removal mechanism 7 provided in the aforementioned embodiment, and a first flotation cell 2, a second flotation cell 3, a third flotation cell 5, a feed box 1, an intermediate box 4, a tailings box 6, a slurry inlet pipe 11, a side slurry suction pipe 12, a froth tank 10, etc. The flotation cell is mainly composed of a tank body, an impeller mechanism, a transmission device, a belt cover 15, etc.

[0048] A flotation machine is an industrial device used for flotation, consisting of a suction tank and a separation tank. The suction tank has a self-priming function, allowing it to automatically draw slurry into the tank for flotation, and can therefore be used independently. The separation tank lacks a self-priming function and relies solely on a suction-type flotation machine for slurry supply; therefore, the separation tank can only be used simultaneously with the suction tank and cannot be used alone. Together, they form a combined unit, achieving a horizontal configuration that eliminates the need for a froth pump. Structurally, two separation tanks form a unit, and each suction tank forms a unit; several connected units constitute a group. Intermediate boxes 4 connect the various operating groups to control the liquid level.

[0049] In some embodiments, the first flotation cell 2 is an XCF type suction cell, the second flotation cell 3 is a KYF type direct current cell, the third flotation cell 5 is an XCF type suction cell, the feed box 1 is located at the left end of the first flotation cell 2, the second flotation cell 3 is located at the right end of the first flotation cell 2, the intermediate box 4 is located at the right end of the second flotation cell 3, the third flotation cell 5 is located at the right end of the intermediate box 4, and the tailings box 6 is located at the right end of the third flotation cell 5. In some embodiments, the side suction pipe 12 is provided on both the first flotation cell 2 and the third flotation cell 5, and the side suction pipe 12 of the first flotation cell 2 and the third flotation cell 5 are respectively directed toward the feed box 1 and the intermediate box 4 at the left end. In some embodiments, the bubble scraping mechanism 7 is disposed on the front and rear sides above the first flotation cell 2, the second flotation cell 3, and the third flotation cell 5; In some embodiments, the slurry inlet pipe 11 is disposed on the front and rear sides of the first flotation cell 2 and the third flotation cell 5; In some embodiments, the foam tank 10 is disposed on the front and rear sides of the upper end of the first flotation tank 2, the second flotation tank 3, and the third flotation tank 5; Specifically, the feed box 1 is located at the left end of the first flotation cell 2 to supply slurry to the first flotation cell 2; the second flotation cell 3 is located at the right end of the first flotation cell 2 to receive slurry through the suction function of the first flotation cell 2; the intermediate box 4 is located at the right end of the second flotation cell 3 to control the liquid level and connect to subsequent flotation cells; the third flotation cell 5 is located at the right end of the intermediate box 4 to receive slurry through the intermediate box 4; and the tailings box 6 is located at the right end of the third flotation cell 5 to collect the final tailings; the first flotation cell 2 and the second flotation cell 3... Each of the three flotation cells 5 is equipped with a side suction pipe 12. The side suction pipe 12 of the first flotation cell 2 faces the feed box 1 at the left end, and the side suction pipe 12 of the third flotation cell 5 faces the middle box 4 at the left end, so as to realize the suction and circulation of slurry. The slurry inlet pipe 11 is set on the front and rear sides of the first flotation cell 2 and the third flotation cell 5, and is used to supplement or adjust the slurry inflow. The foam tank 10 is set on the front and rear sides of the upper end of the first flotation cell 2, the second flotation cell 3 and the third flotation cell 5, and is used to collect the scraped foam (concentrate).

[0050] Specifically, the flotation cell of this application is equipped with overflow weirs on both the front and rear sides, and a froth tank 10 is set below the overflow weirs. The froth is scraped into the froth tank 10 by the scraper 21 on the froth scraping mechanism 7 to form concentrate or returned to the cell for recirculation and separation, producing middlings or tailings. In the prior art, since a typical flotation machine uses a single scraper 21 on one side to scrape the froth, a large amount of froth in the rear and middle of the flotation cell cannot be quickly scraped into the froth tank 10, resulting in froth accumulation. If the reagent dosage is adjusted to reduce froth formation, the beneficiation efficiency of the flotation unit will be reduced. To solve this problem, this application changes the rear structure of the flotation cell by adding an overflow weir, increasing the number of overflow weirs from one to two. Correspondingly, the froth scraping mechanism 7 is also changed from one set to two sets arranged symmetrically front and rear, achieving double the number of froth scraping times per unit time and improving the flotation efficiency of the original equipment. To address the issue of foam buildup in the middle of the flotation cells, this application adds a set of scraper 21 components to the front and rear sides of the first flotation cell 2, the second flotation cell 3, and the third flotation cell 5, thus transforming the foam scraping mechanism 7 into a double-sided four-scraper 21 structure.

[0051] Note that, unless otherwise explicitly stated, all features disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by alternative features for achieving the same, equivalent, or similar purpose. Therefore, unless explicitly stated otherwise, each disclosed feature is merely one example of a set of equivalent or similar features. Where used, "further," "preferably," "even further," and "more preferably" are simply starting points for describing another embodiment based on the foregoing embodiments, the combination of which with the foregoing embodiments constitutes the complete configuration of another embodiment. Any combination of several "further," "preferably," "even further," or "more preferably" settings following the same embodiment constitutes yet another embodiment.

[0052] In the implementation of functions and steps, the corresponding functions and steps in the various embodiments may occur in a different order than those shown. For example, two consecutive functions and steps may actually be executed or implemented substantially in parallel, and they may sometimes be executed or implemented in reverse order, depending on the functions involved.

[0053] Although this application has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this application fall within the scope of protection claimed in this application.

Claims

1. A frothing mechanism for a high-efficiency frothing flotation machine, characterized in that, include: The components include a speed reducer, speed reducer frame, large synchronous pulley, small synchronous pulley, synchronous belt, UCP bearing housing, spokes, scraper shaft, and central bearing housing. The speed reducer is located at one end of the flotation cell and is fixedly connected to the speed reducer frame, which is fixedly connected to the top frame of the flotation cell. The small synchronous pulley is fixed to the output shaft of the reducer by a key connection, and the large synchronous pulley is fixed to one end of the scraper shaft by a key connection. The large synchronous pulley and the small synchronous pulley are engaged by the synchronous belt. Two scraper shafts are provided on each of the front and rear sides of each flotation cell. The scraper shafts span the width of the flotation cell and are supported at both ends by UCP bearing seats and in the middle by a central bearing body. The scraper shaft is parallel to the overflow weir of the flotation cell and is located above the foam tank.

2. The frothing mechanism of the high-efficiency frothing flotation machine according to claim 1, characterized in that, Also includes: A scraper, the scraper being connected to the scraper shaft via spokes; The spokes are radially mounted arm-shaped structures, with one end fixed to the scraper shaft by a key or bolt, and the other end fitted with a scraper.

3. The frothing mechanism of the high-efficiency frothing flotation machine according to claim 2, characterized in that, Multiple spokes and scrapers are installed on each scraper shaft, and the spokes and scrapers are evenly distributed along the length of the scraper shaft.

4. The frothing mechanism of the high-efficiency frothing flotation machine according to claim 1, characterized in that, Also includes: A belt cover, which is bolted to cover the outside of the synchronous belt, the small synchronous pulley, and the large synchronous pulley.

5. A high-efficiency skimmed flotation machine, characterized in that, include: The bubble-scraping mechanism according to any one of claims 1 to 4, and the first flotation cell, the second flotation cell, the third flotation cell, the feed box, the intermediate box, and the tailings box, wherein, The feed box is located at the left end of the first flotation cell, the second flotation cell is located at the right end of the first flotation cell, the intermediate box is located at the right end of the second flotation cell, the third flotation cell is located at the right end of the intermediate box, and the tailings box is located at the right end of the third flotation cell. The bubble scraping mechanism is located on the front and rear sides above the first flotation cell, the second flotation cell, and the third flotation cell.

6. The high-efficiency skimmed flotation machine according to claim 5, characterized in that, The first flotation cell is an XCF type suction cell, the second flotation cell is a KYF type direct current cell, and the third flotation cell is an XCF type suction cell.

7. The high-efficiency skimmed flotation machine according to claim 5, characterized in that, Both the first and third flotation cells are equipped with side suction pipes, which face the feed box and the intermediate box on the left, respectively.

8. The high-efficiency skimmed flotation machine according to claim 5, characterized in that, Also includes: The feed pipe is disposed on the front and rear sides of the first flotation cell and the third flotation cell; Foam tanks are disposed on the front and rear sides of the upper ends of the first flotation cell, the second flotation cell, and the third flotation cell.

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