A chute scab cleaning system

Abstract

This invention relates to the field of alumina production technology, specifically to a chute scaling removal system. The system includes a feed pipe and a chute. The feed pipe is mounted on and communicates with the chute. An inner scraper and an outer scraper are installed inside the chute. The inner scraper is slidably connected to the inner wall of the chute, and the outer scraper is also slidably connected to the inner wall of the chute and simultaneously to one side of the inner scraper. A transmission mechanism is installed at the upper end of the outer scraper, and this transmission mechanism is connected to both the inner and outer scrapers to move and clean the scaling on the chute surface. This invention offers reliable performance, flexible operation, and simple cleaning. It can efficiently, safely, and environmentally friendly prevent chute blockage, ensure stable long-term production operation, alleviate scaling, solve production pain points, significantly improve work efficiency, reduce worker labor intensity, and prevent safety accidents.

Description

Technical Field

[0001] This invention relates to the field of alumina production technology, specifically to a chute scaling and cleaning system. Background Technology

[0002] In alumina production, the slurry conveying process of the decomposition and filtration stage employs a large inclined chute design. The coarse vertical disc filter cake from the previous stage is pumped into the large chute via a feed pipe. Refined sodium aluminate solution (refined liquid) is pumped from the refined liquid tank to the high starting point of the inclined large chute via a bottom-mounted pump. The filter cake in the large chute is then washed and mixed by the refined liquid and sent to the long trough. Due to the high supersaturation and low stability of the refined liquid, a decrease in temperature causes aluminum hydroxide to crystallize and precipitate from it. This is especially true for refined liquids containing oxalate; during cooling, the high oxalate content causes oxalate and aluminum hydroxide to crystallize together, forming dense scale. The entire process operates continuously. During this time, as the sodium aluminate solution flows through the feed port of the previous coarse vertical plate, the filter cake falls into the solution. The splashed solution adheres to the walls of the large chute. The fluctuation of the solution surface also accelerates the crystallization and precipitation of residual solution on the walls of the large chute, forming scale. As the scale gradually grows and accumulates towards the center of the large chute, the flow area is reduced, and the large chute may even be blocked, seriously affecting the operation of the decomposition tank. It is necessary to regularly remove and clean it.

[0003] Currently, the main methods for cleaning scale buildup on the walls of large chute are as follows:

[0004] ① Adding a steam heating system near the discharge port might increase the temperature and reduce the possibility of aluminum hydroxide precipitation, but the steam needs to be pressurized to ensure superheating, which could cause solution splashing. Furthermore, the condensed steam dilutes the sodium aluminate solution, requiring more heat for subsequent evaporation, resulting in energy waste. ② Adding a mechanical rapping system increases the impact on the building platform surface due to chute vibration, and may cause weld cracking at the chute welds. ③ The existing production process requires periodic shutdowns for cleaning. The thick, large scale buildup is tedious and dangerous to clean, consuming significant manpower and resources. For manufacturing companies, time equals output and profit; often, to maintain production, maintenance cycles are deliberately extended, leading to severe blockages in large chutes, making cleaning difficult and hindering proper maintenance. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a chute scaling cleaning system for decomposition processes. This chute scaling cleaning system is reliable in performance, flexible in operation, and simple to clean. It can efficiently, safely, and environmentally prevent chute blockage, ensure stable operation over long production cycles, alleviate scaling, solve production pain points, significantly improve work efficiency, reduce the labor intensity of workers, and prevent safety accidents.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A chute scale removal system includes a discharge pipe and a chute. The discharge pipe is disposed on and communicates with the chute. An inner scraper and an outer scraper are provided inside the chute. The inner scraper is slidably connected to the inner wall of the chute, and the outer scraper is slidably connected to the inner wall of the chute and simultaneously slidably connected to one side of the inner scraper. A transmission mechanism is provided in the upper end of the outer scraper. The transmission mechanism is connected to both the inner and outer scrapers to drive the inner and outer scrapers to move and clean the scale on the surface of the chute.

[0008] In this invention, the upper part of the inner wall of the chute is provided with a first chute, the top of the chute is provided with a slide rail, the upper end of the inner scraper is slidably disposed in the first chute, the upper end face of the outer scraper is slidably disposed in the slide rail, and the outer scraper is in contact with the inner scraper.

[0009] In this invention, the upper end of the outer scraper is a U-shaped structure, the opening of the U-shaped structure faces the side wall of the chute, and the upper end of the inner scraper is a flat plate, one side of the flat plate is slidably disposed in the first chute, and the other side of the flat plate is slidably disposed in the U-shaped structure of the outer scraper.

[0010] In this invention, the transmission mechanism further includes a motor, a gear set, and a rack. The motor is mounted on the outer wall of the chute, and the output shaft of the motor extends through the side wall of the chute into the U-shaped structure of the outer scraper. The gear set includes a first gear and a second gear, the diameter of which is larger than that of the second gear. The first gear is mounted on the output shaft of the motor, and the second gear is mounted on the upper part of the inner wall of the chute, meshing with the first gear. The rack includes a first rack and a second rack. One side of the first rack is slidably mounted in a first groove, and the top of the first rack meshes with the first gear. The bottom of the first rack is fixedly connected to the flat plate at the upper end of the inner scraper. A second groove is also provided on the upper part of the inner wall of the chute above the first groove. One side of the second rack is slidably mounted in the second groove, and the bottom of the second rack meshes with the second gear. The top of the second rack is fixedly connected to the inner top of the U-shaped structure of the outer scraper.

[0011] In this invention, the width of the first groove is greater than the width of the second groove.

[0012] In this invention, the inner scraper and the outer scraper are provided on the two opposite inner sidewalls of the chute, and two sets of transmission mechanisms are provided. The two sets of transmission mechanisms are respectively connected to the inner scraper and the outer scraper on both sides to drive the inner scraper and the outer scraper on both sides to move respectively.

[0013] In this invention, the chute further includes an upper plate surface, a side wall, and a bottom surface; the first chute and the second chute are spaced apart on the upper part of the side wall; and the slide is disposed on the upper plate surface.

[0014] In this invention, the chute is further described as a large, inclined, square-barrel-shaped chute.

[0015] Furthermore, in this invention, a manhole door is provided on the chute corresponding to the transmission mechanism, and a manhole door cover is provided on the manhole door.

[0016] By adopting the above technical solution, the present invention has the following beneficial effects:

[0017] This invention, by simultaneously incorporating an inner scraper, an outer scraper, and a transmission mechanism for driving them within a chute, allows the inner and outer scrapers to move rapidly along the chute's inner wall simultaneously. This effectively cleans scale buildup on the chute's inner surface. The outer scraper moves at a faster speed than the inner scraper, scraping away the outer layer of scale first, thus reducing the working pressure on the inner scraper. This not only extends the inner scraper's lifespan but also significantly improves the efficiency of scale removal. Therefore, this invention offers reliable performance, flexible operation, and simple cleaning. It efficiently, safely, and environmentally friendly prevents chute blockage, ensures stable long-term production operations, alleviates scale buildup, addresses production pain points, significantly improves work efficiency, reduces worker workload, and prevents safety accidents. Furthermore, the U-shaped structure at the upper end of the outer scraper facilitates close contact with the inner scraper and ensures that their movements do not interfere with each other, resulting in a compact structure and excellent scale removal effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a chute scale removal system according to the present invention. Figure 1 (When the chute top plate and manhole cover are closed);

[0019] Figure 2 This is a schematic diagram of the structure of a chute scale removal system according to the present invention. Figure 2 (When the chute top plate and manhole cover are open);

[0020] Figure 3 This is a partial schematic diagram of the connection between the inner scraper, the outer scraper, and the transmission mechanism in a chute scale cleaning system of the present invention.

[0021] Figure 4 This is a side view of the chute sidewall in a chute scale removal system according to the present invention.

[0022] Figure 5 This is a bottom view of the upper plate surface of the chute in a chute scale cleaning system according to the present invention.

[0023] The reference numerals in the diagram are as follows: 1. Feed pipe; 2. Chute; 21. Chute upper plate; 22. Chute side wall; 23. Chute bottom; 3. Inner scraper; 31. Flat plate; 4. Outer scraper; 41. U-shaped structure; 5. First chute; 6. Slide rail; 7. Motor; 8. First gear; 9. Second gear; 10. First rack; 11. Second rack; 12. Second chute; 13. Manhole cover. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only. Example

[0026] Please see Figures 1 to 5 A chute scale removal system includes a discharge pipe 1 and a chute 2, wherein the chute 2 is a large, inclined, square-barrel-shaped chute. The discharge pipe 1 is disposed on and communicates with the chute 2. The chute 2 is equipped with an inner scraper 3 and an outer scraper 4 (also referred to as an inner scraper and an outer scraper). The inner scraper 3 is slidably connected to the inner wall of the chute 2, and the outer scraper 4 is slidably connected to the inner wall of the chute 2 and simultaneously slidably connected to one side of the inner scraper 3. A transmission mechanism is provided in the upper end of the outer scraper 4. The transmission mechanism is connected to both the inner scraper 3 and the outer scraper 4 to drive the inner scraper 3 and the outer scraper 4 to move and clean the scale on the surface of the chute 2.

[0027] In this embodiment, more specifically, the upper part of the inner wall of the chute 2 is provided with a first chute 5, the top of the chute 2 is provided with a slide 6, the upper side of the inner scraper 3 is slidably disposed in the first chute 5, the upper end face of the outer scraper 4 is slidably disposed in the slide 6, and the outer scraper 4 is in contact with the inner scraper 3 so as to facilitate the rapid movement of the outer scraper 4 and the inner scraper 3, thereby quickly cleaning the scabs in the chute 2.

[0028] As a further specific technical solution, in this embodiment, the upper end of the outer scraper 4 is a U-shaped structure 41, with the opening of the U-shaped structure 41 facing the sidewall 22 of the chute 2. The upper end of the inner scraper 3 is a flat plate 31, one side of which is slidably disposed within the first chute 5, and the other side of which is slidably disposed within the U-shaped structure 41 of the outer scraper 4. This arrangement facilitates the close fit between the outer scraper 4 and the inner scraper 3, and the movement of the outer scraper 4 and the inner scraper 3 does not interfere with each other. This not only results in a compact structure but also provides excellent scab removal. Furthermore, the U-shaped structure 41 facilitates the installation of the transmission mechanism, allowing the transmission mechanism to smoothly drive the outer scraper 4 to move.

[0029] As a further specific technical solution, in this embodiment, the transmission mechanism includes a motor 7, a gear set, and a rack. The motor 7 is located on the outer wall of the chute 2, and the output shaft of the motor 7 extends through the side wall of the chute 2 into the U-shaped structure 41 of the outer scraper 4. The gear set includes a first gear 8 and a second gear 9, wherein the diameter of the first gear 8 is larger than the diameter of the second gear 9. The first gear 8 is located on the output shaft of the motor 7, and the second gear 9 is located on the upper part of the inner wall of the chute 2, and the second gear 9 is meshed with the first gear 8. The rack includes a first rack 10 and a second rack 11. One side of the first rack 10 is slidably located in the first groove 5, and the top of the first rack 10 is meshed with the first gear 8. The bottom of the first rack 10 is fixedly connected to the flat plate 31 at the upper end of the inner scraper 3, so that the rotation of the first gear 8 drives the first rack 10 to move, and the movement of the first rack 10 drives the inner scraper 3 to move. The upper part of the inner wall of the chute 2, above the first chute 5, is further provided with a second chute 12. One side of the second rack 11 is slidably disposed in the second chute 12, and the bottom of the second rack 11 is meshed with the second gear 9. The top of the second rack 11 is fixedly connected to the inner top of the U-shaped structure 41U of the outer scraper 4, so that the rotation of the first gear 8 drives the rotation of the second gear 9, the rotation of the second gear 9 drives the movement of the second rack 11, and the movement of the second rack 11 drives the movement of the outer scraper 4. In this way, the movement of the inner scraper 3 and the outer scraper 4 can be realized, and the scale on the inner wall of the chute 2 can be cleaned. Furthermore, since the diameter of the first gear 8 is larger than the diameter of the second gear 9 (i.e., the number of teeth of the first gear 8 is greater than the number of teeth of the second gear 9), the rotational speed of the second gear 9 is greater than that of the first gear 8. Consequently, the moving speed of the outer scraper 4 is greater than that of the inner scraper 3 during the process of cleaning the scale. The outer scraper 4 scrapes off the outer layer of scale first, which reduces the working pressure of the inner scraper 3. This not only improves the service life of the inner scraper 3, but also greatly improves the efficiency of cleaning the scale.

[0030] It should be noted that, since the flat plate 31 and the first rack 10 at the upper end of the inner scraper 3 are both embedded (inserted) in the first groove 5, and the second rack 11 is embedded (inserted) in the second groove 12, so that the first rack 10 and the second rack 11 are fixed and directionally transmitted to prevent the rack from tilting, the width of the first groove 5 is greater than the width of the second groove 12.

[0031] In order to thoroughly clean the scale on both inner walls of the chute 2, the inner scraper 3 and the outer scraper 4 are provided on both opposite inner walls of the chute 2. Two sets of transmission mechanisms are also provided, which are respectively connected to the inner scraper 3 and the outer scraper 4 on both sides to drive the inner scraper 3 and the outer scraper 4 on both sides to move respectively.

[0032] Specifically, the chute 2 includes an upper plate 21, a side wall 22, and a bottom 23. The first chute 5 and the second chute 12 are spaced apart on the upper part of the side wall 22, and the slide 6 is provided on the upper plate 21.

[0033] To facilitate the installation of the inner scraper 3, outer scraper 4, and transmission mechanism, a manhole door is provided on the chute 2 corresponding to the transmission mechanism, and a manhole door cover 13 is provided on the manhole door. During installation, first open the manhole door cover 13 to install the inner scraper 3 and transmission mechanism, then install the outer scraper 4, and finally close the manhole door cover 13. The manhole door cover 13 is made of a push-pull sliding cover. The outer scraper 4 and inner scraper 3 can also be removed from the manhole door for separate cleaning.

[0034] The working principle of this invention is as follows: In actual production, the coarse vertical disc filter cake from the previous stage falls from the feed pipe 1 into the solution in the inclined large chute after being filtered. The splashed solution adheres to the inner wall 22 of the chute, and gradually crystallizes and precipitates as the temperature decreases, eventually forming a crust. The transmission mechanism is activated to make the outer scraper 4 and the inner scraper 3 reciprocate. The outer scraper 4 is used to scrape off the outer crust to reduce its size, while the inner scraper 3 mainly cleans the tightly adhered parts on the inner wall 22 of the chute. During production, the cleaning system is activated periodically to clean the crust through the reciprocating motion of the outer scraper 4 and the inner scraper 3 to alleviate the crusting on the wall of the large chute.

[0035] This invention, by simultaneously installing an inner scraper 3 and an outer scraper 4 within the chute 2, along with a transmission mechanism for driving the inner and outer scrapers 3 and 4, allows the inner and outer scrapers 3 and 4 to move rapidly and simultaneously on the inner wall 22 of the chute. This effectively cleans scale buildup on the surface of the inner wall 22. The outer scraper 4 moves at a greater speed than the inner scraper 3, scraping off the outer layer of scale first. This reduces the working pressure on the inner scraper 3, extending its service life and significantly improving the efficiency of scale removal. Therefore, this invention offers reliable performance, flexible operation, and simple cleaning. It efficiently, safely, and environmentally friendly prevents chute blockage, ensures stable long-term production operations, alleviates scale buildup, addresses production pain points, significantly improves work efficiency, reduces worker workload, and prevents safety accidents.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

Claims

1. A chute scale removal system, characterized in that: Includes a feed pipe (1) and a chute (2). The feed pipe (1) is located on the chute (2) and communicates with the chute (2). The chute (2) is provided with an inner scraper (3) and an outer scraper (4). The inner scraper (3) is slidably connected to the inner wall of the chute (2). The outer scraper (4) is slidably connected to the inner wall of the chute (2) and simultaneously slidably connected to one side of the inner scraper (3). The upper end of the outer scraper (4) is provided with a transmission mechanism. The transmission mechanism is connected to both the inner scraper (3) and the outer scraper (4) so ​​as to drive the inner scraper (3) and the outer scraper (4) to move and clean the surface of the chute by the transmission mechanism. The upper part of the inner wall of the chute (2) is provided with a first chute (5), and the top of the chute (2) is provided with a slide (6). The upper side of the inner scraper (3) is slidably disposed in the first chute (5), and the upper end face of the outer scraper (4) is slidably disposed in the slide (6), and the outer scraper (4) is in contact with the inner scraper (3). The upper end of the outer scraper (4) is a U-shaped structure (41), and the opening of the U-shaped structure (41) faces the side wall (22) of the chute (2). The upper end of the inner scraper (3) is a flat plate (31), one side of the flat plate (31) is slidably disposed in the first chute (5), and the other side of the flat plate (31) is slidably disposed in the U-shaped structure (41) of the outer scraper (4). The transmission mechanism includes a motor (7), a gear set, and a rack. The motor (7) is located on the outer wall of the chute (2). The output shaft of the motor (7) extends through the side wall of the chute (2) into the U-shaped structure (41) of the outer scraper (4). The gear set includes a first gear (8) and a second gear (9). The diameter of the first gear (8) is larger than the diameter of the second gear (9). The first gear (8) is located on the output shaft of the motor (7). The second gear (9) is located on the upper part of the inner wall of the chute (2), and the second gear (9) meshes with the first gear (8). The rack includes a first rack (10) and a second rack (11). The first rack (10) is slidably disposed in the first groove (5) on one side, and the top of the first rack (10) is meshed with the first gear (8), and the bottom of the first rack (10) is fixedly connected to the plate (31) at the upper end of the inner scraper (3); the upper part of the inner wall of the chute (2) is also provided with a second groove (12) above the first groove (5), the second rack (11) is slidably disposed in the second groove (12) on one side, and the bottom of the second rack (11) is meshed with the second gear (9), and the top of the second rack (11) is fixedly connected to the inner top of the U-shaped structure (41) of the outer scraper (4).

2. The chute scale removal system as described in claim 1, characterized in that: The width of the first groove (5) is greater than the width of the second groove (12).

3. The chute scale removal system as described in claim 1, characterized in that: The inner scraper (3) and outer scraper (4) are provided on the two opposite inner sidewalls of the chute (2). The transmission mechanism is provided in two sets, which are respectively connected to the inner scraper (3) and outer scraper (4) on both sides to drive the inner scraper (3) and outer scraper (4) on both sides to move respectively.

4. The chute scale removal system as described in claim 1, characterized in that: The chute (2) includes an upper plate (21), a side wall (22), and a bottom (23). The first chute (5) and the second chute (12) are spaced apart on the upper part of the side wall (22), and the slide (6) is located on the upper plate (21).

5. The chute scale cleaning system as described in claim 1, characterized in that: The chute (2) is a large inclined chute in the shape of a square barrel.

6. The chute scale removal system as described in claim 1, characterized in that: A manhole door is also provided on the chute (2) at the location corresponding to the transmission mechanism, and a manhole door cover (13) is provided on the manhole door.

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