Conical vacuum mixing dryer

Abstract

The conical vacuum mixing dryer comprises a conical tank body and a stirring assembly, the stirring assembly comprises a stirring shaft, the stirring shaft is connected with a spiral stirring paddle through a plurality of connecting plates, and a bottom limiting ring and an upper limiting ring are independently and detachably arranged on the stirring shaft. The spiral stirring paddle is located between the bottom limiting ring and the upper limiting ring and does not make contact with the bottom limiting ring and the upper limiting ring, two upper limiting blocks and two lower limiting blocks are independently arranged on the stirring shaft, the two upper limiting blocks are connected with the upper limiting ring, the two lower limiting blocks are connected with the bottom limiting ring, and the lower limiting blocks are connected with the lower limiting ring. The two upper limiting blocks and the two lower limiting blocks are correspondingly arranged up and down, the two upper limiting blocks are symmetrically arranged, and the two lower limiting blocks are symmetrically arranged. The device further comprises a cleaning assembly which is located in the conical tank body. Through the arrangement of the long supporting arm, the short supporting arm and the cleaning scraping plate, materials adhering to the inner wall of the conical tank body are scraped, and the cleanliness of the inner wall of the conical tank body is improved.

Description

Technical Field

[0001] This invention belongs to the field of drying technology, specifically relating to a conical vacuum mixing dryer. Background Technology

[0002] A dryer is a mechanical device that uses heat energy to reduce the moisture content of materials, used for drying objects. The dryer heats the material to vaporize and release the moisture (generally water or other volatile liquid components), obtaining a solid material with a specified moisture content. The purpose of drying is to meet the needs of material use or further processing. Dryers are widely used in industries such as chemical, pesticide, dye, pharmaceutical, fertilizer, metallurgy, mining, food, plastics, and additives.

[0003] However, existing dryers are not ideal for cleaning the sticky material on the inner wall of the dryer. After use, the dryer still needs to be manually cleaned by the staff. Because the cleaning port of the dryer is small, the cleaning effect is not thorough, leaving material residue on the inner wall of the dryer. Therefore, a conical vacuum mixing dryer is needed to solve the above problems. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a conical vacuum mixing dryer to solve the technical problem of unsatisfactory cleaning effect of the dryer in the existing technology.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A conical vacuum mixing dryer includes a conical tank with a hemispherical discharge valve at the lower end and a sealed tank cover at the upper end. It also includes a stirring assembly with a stirring shaft connected to a spiral stirring paddle via multiple connecting plates. The stirring shaft is also equipped with a bottom limiting ring and an upper limiting ring, each independently and detachably mounted. The spiral stirring paddle is located between the bottom and upper limiting rings and does not contact either ring. The stirring shaft also has two upper limit blocks and two lower limit blocks, each independently mounted. The two upper limit blocks are connected to the upper limiting ring, and the two lower limit blocks are connected to the bottom limiting ring. The upper and lower limit blocks are arranged symmetrically, one above the other.

[0006] It also includes a cleaning component, which is located inside the conical tank.

[0007] The present invention also has the following technical features: The stirring assembly includes a drive motor, the output end of which is connected to the input end of a reducer. The reducer is mounted on the top of a cylindrical sealing connector, the bottom of which is integrally connected to the sealing tank cover. The output end of the reducer is connected to the top of a stirring shaft. The bottom end of the stirring shaft passes through the sealing tank cover and extends into the conical tank. The stirring shaft is located at the center of the sealing tank cover. The end of the stirring shaft closest to the reducer is mounted in the middle of the sealing connector via a bearing.

[0008] The cleaning assembly includes an arc-shaped upper connecting plate and an upper docking plate. Upper limit plates are provided on both sides of the opening of the upper connecting plate and the upper docking plate. An upper limit groove is formed in the middle of the inner wall of the arc-shaped bottom of both the upper connecting plate and the upper docking plate. Two upper limit blocks are respectively engaged and inserted into the upper limit groove. The upper limit plates are detachably connected to the stirring shaft via upper positioning bolts. The lower surfaces of the upper connecting plate and the upper docking plate are in contact with the upper surface of the upper limiting ring. The middle of the outer wall of the arc-shaped bottom of the upper connecting plate and the upper docking plate is fixedly connected to one end of a long support arm, and the other end of the long support arm is connected to the upper end of the cleaning scraper.

[0009] The cleaning assembly also includes a lower connecting plate and a lower docking plate. Both the lower connecting plate and the lower docking plate have lower limiting ears on both sides of their openings. A lower limiting groove is formed in the middle of the inner wall of the arc-shaped bottom of both the lower connecting plate and the lower docking plate. Two lower limiting blocks are respectively engaged and inserted into the lower limiting grooves. The lower limiting ears are detachably connected to the stirring shaft via lower positioning bolts. The lower surfaces of the lower connecting plate and the lower docking plate are in contact with the upper surface of the bottom limiting ring. The outer walls of the arc-shaped bottom of the lower connecting plate and the lower docking plate are respectively fixedly connected to one end of a short support arm. The other ends of the short support arms are respectively connected to the lower end of the cleaning scraper. The lower connecting plate and the lower docking plate are located below the spiral stirring paddle and do not contact the spiral stirring paddle.

[0010] The outer side of the spiral agitator does not contact the inner side of the cleaning scraper, while the outer side of the cleaning scraper contacts the inner wall of the conical tank.

[0011] The lengths of the multiple connecting plates decrease sequentially from top to bottom.

[0012] The upper limit ear plate has a through upper bolt hole, and an upper positioning bolt is installed in the upper bolt hole, so that the upper connecting plate and the upper docking plate can be detachably connected.

[0013] The lower limit ear plate has a through lower bolt hole, and a lower positioning bolt is installed in the lower bolt hole, so that the lower connecting plate and the lower docking plate can be detachably connected.

[0014] The lower end face of the bottom limiting ring is flush with the lower end face of the stirring shaft, while the upper end face of the upper limiting ring is not flush with the upper end face of the stirring shaft. The upper limiting ring is located inside the conical tank.

[0015] The sealed tank lid is also equipped with a pulse backflushing device.

[0016] The sealed tank cover is also independently equipped with a cleaning port and a feed valve, which are located on the same side as the pulse backflushing device.

[0017] Multiple weighing sensors are evenly arranged on the outer wall of the conical tank, and the multiple weighing sensors are located in the upper middle position of the outer wall of the conical tank.

[0018] The inner arc of the upper connecting plate and the upper docking plate is in contact with the outer wall of the stirring shaft, and the inner arc of the lower connecting plate and the lower docking plate is in contact with the outer wall of the stirring shaft.

[0019] Compared with the prior art, the present invention has the following technical effects: (I) The conical vacuum mixing dryer proposed in this invention uses an upper connecting plate, an upper docking plate, a lower connecting plate, and a lower docking plate to be respectively engaged on both sides of the stirring shaft. An upper limit block and a lower limit block are respectively engaged inside the upper limit groove and the lower limit groove, thereby achieving a limiting connection of the upper connecting plate, the upper docking plate, the lower connecting plate, and the lower docking plate. This facilitates the disassembly of the upper connecting plate, the upper docking plate, the lower connecting plate, and the lower docking plate. Furthermore, the long support arm and the short support arm, along with the cleaning scraper, enable the scraping of materials adhering to the inner wall of the conical tank, improving the cleanliness of the inner wall of the conical tank and increasing the cleaning efficiency of the workers.

[0020] (II) The conical vacuum mixing dryer proposed in this invention drives the stirring shaft to rotate through the set drive motor and reducer, thereby improving the stability of the stirring shaft. The outer wall of the stirring shaft is equipped with a spiral stirring paddle, thereby realizing the upward transmission of the material inside the tank during the stirring process, so that the material falls back into the tank from the height, improving the stirring efficiency and reducing the occurrence of condensation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a conical vacuum mixing dryer.

[0022] Figure 2 This is a cross-sectional structural diagram of a conical vacuum mixing dryer.

[0023] Figure 3 This is a schematic diagram of the stirring assembly.

[0024] Figure 4 This is a structural diagram of the cleanup component.

[0025] Figure 5 This is a schematic diagram of the unfolded structure of the lower connecting plate and the lower docking plate.

[0026] The meanings of the labels in the diagram are as follows: 1-conical tank, 2-hemispherical discharge valve, 3-sealed tank cover, 4-stirring assembly, 5-bottom limiting ring, 6-upper limiting ring, 8-lower limiting block, 9-cleaning assembly, 10-pulse backflushing device, 11-cleaning port, 12-feed valve, 13-weighing sensor; 401-Drive motor, 402-Reducer, 403-Sealing connector, 404-Agitator shaft, 405-Connecting plate, 406-Helical agitator.

[0027] 901 - Upper connecting plate, 902 - Upper docking plate, 903 - Upper limit ear plate, 905 - Upper positioning bolt, 906 - Long support arm, 907 - Cleaning scraper, 908 - Lower connecting plate, 909 - Lower docking plate, 910 - Lower limit ear plate, 911 - Lower limit groove, 912 - Lower positioning bolt, 913 - Short support arm. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the equipment and components used in this invention are all known from the prior art.

[0029] Following the above technical solutions, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0030] Example 1: This embodiment provides a conical vacuum mixing dryer, such as... Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the device includes a conical tank 1, with a hemispherical discharge valve 2 at the lower end and a sealing tank cover 3 at the upper end. It also includes a stirring assembly 4, which includes a stirring shaft 404 connected to a spiral stirring paddle 406 via multiple connecting plates 405. The stirring shaft 404 is also independently and detachably equipped with a bottom limiting ring 5 and an upper limiting ring 6. The spiral stirring paddle 406 is located between the bottom limiting ring 5 and the upper limiting ring 6, and does not contact either the bottom or upper limiting rings. The stirring shaft 404 is also independently equipped with two upper limit blocks and two lower limit blocks 8. The two upper limit blocks are connected to the upper limiting ring 6, and the two lower limit blocks 8 are connected to the bottom limiting ring 5. The two upper limit blocks and two lower limit blocks 8 are arranged symmetrically, one above the other.

[0031] like Figure 2 As shown, it also includes a cleaning component 9, which is located inside the conical tank 1.

[0032] As a preferred embodiment of this invention, such as Figure 1 and Figure 2 As shown, the stirring assembly 4 also includes a drive motor 401. The output end of the drive motor 401 is connected to the input end of the reducer 402. The reducer 402 is installed on the top of the cylindrical sealing connector 403. The bottom of the sealing connector 403 is integrally connected to the sealing tank cover 3. The output end of the reducer 402 is connected to the top end of the stirring shaft 404. The bottom end of the stirring shaft 404 passes through the sealing tank cover 3 and extends into the conical tank 1. The stirring shaft 404 is located at the center of the sealing tank cover 3. The end of the stirring shaft 404 near the reducer 402 is installed in the middle of the sealing connector 403 through a bearing.

[0033] As a preferred embodiment of this invention, such as Figure 2 and Figure 4 As shown, it also includes a cleaning component 9, which includes an arc-shaped upper connecting plate 901 and an upper docking plate 902. Upper limit plates 903 are provided on both sides of the openings of the upper connecting plate 901 and the upper docking plate 902. Upper limit grooves are provided in the middle of the inner walls of the arc-shaped bottom of the upper connecting plate 901 and the upper docking plate 902. Two upper limit blocks are respectively engaged and inserted into the upper limit grooves. The upper limit plates 903 are detachably connected to the stirring shaft 404 via upper positioning bolts 905. The lower surfaces of the upper connecting plate 901 and the upper docking plate 902 are in contact with the upper surface of the upper limiting ring 6. The middle of the outer walls of the arc-shaped bottom of the upper connecting plate 901 and the upper docking plate 902 are respectively fixedly connected to one end of a long support arm 906, and the other end of the long support arm 906 is respectively connected to the upper end of a cleaning scraper 907.

[0034] As a preferred embodiment of this invention, such as Figure 4 and Figure 5 As shown, the cleaning component 9 also includes a lower connecting plate 908 and a lower docking plate 909. Both sides of the opening of the lower connecting plate 908 and the lower docking plate 909 are provided with lower limiting ear plates 910. A lower limiting groove 911 is formed in the middle of the inner wall of the arc-shaped bottom of both the lower connecting plate 908 and the lower docking plate 909. Two lower limiting blocks 8 are respectively engaged and inserted into the lower limiting groove 911. The lower limiting ear plates 910 are connected to the lower connecting plate 908 and the lower docking plate 909 by lower positioning bolts 912. The stirring shaft 404 is detachably connected. The lower surfaces of the lower connecting plate 908 and the lower docking plate 909 are in contact with the upper surface of the bottom limiting ring 5. The middle of the arc-shaped bottom outer wall of the lower connecting plate 908 and the lower docking plate 909 is fixedly connected to one end of the short support arm 913. The other end of the short support arm 913 is connected to the lower end of the cleaning scraper 907. The lower connecting plate 908 and the lower docking plate 909 are located below the spiral stirring paddle 406 and do not contact the spiral stirring paddle 406.

[0035] As a preferred embodiment of this invention, such as Figure 2 As shown, the outer side of the spiral agitator 406 does not contact the inner side of the cleaning scraper 907, while the outer side of the cleaning scraper 907 contacts the inner wall of the conical tank 1.

[0036] As a preferred embodiment of this invention, such as Figure 2 and Figure 3 As shown, the lengths of the multiple connecting plates 405 decrease sequentially from top to bottom.

[0037] As a preferred embodiment, the unfolded structural diagrams of the upper connecting plate 901 and the upper docking plate 902 and the lower connecting plate 908 and the lower docking plate 909 are basically the same, such as... Figure 5 As shown, the upper limit ear plate 903 has a through upper bolt hole, in which an upper positioning bolt 905 is installed, allowing the upper connecting plate 901 and the upper docking plate 902 to be detachably connected; the lower limit ear plate 910 has a through lower bolt hole, in which a lower positioning bolt 912 is installed, allowing the lower connecting plate 908 and the lower docking plate 909 to be detachably connected, improving the ease of use of the device.

[0038] As a preferred embodiment of this invention, such as Figure 4 As shown, the lower end face of the bottom limiting ring 5 is flush with the lower end face of the stirring shaft 404, while the upper end face of the upper limiting ring 6 is not flush with the upper end face of the stirring shaft 404. The upper limiting ring 6 is located inside the conical tank 1.

[0039] As a preferred embodiment of this invention, such as Figure 1 and Figure 2 As shown, a pulse backflushing device 10 is also installed on the sealed tank cover 3.

[0040] As a preferred embodiment of this invention, such as Figure 1 and Figure 2 As shown, the sealed tank cover 3 is also independently provided with a cleaning port 11 and a feed valve 12, and the cleaning port 11 and the feed valve 12 are located on the same side as the pulse backflushing device 10.

[0041] As a preferred embodiment of this invention, such as Figure 1 As shown, multiple weighing sensors 13 are evenly arranged on the outer wall of the conical tank 1, and the multiple weighing sensors 13 are located in the upper middle position of the outer wall of the conical tank 1.

[0042] As a preferred embodiment, the bottom limiting ring 5 and the upper limiting ring 6 are bolted to the stirring shaft 404.

[0043] As a preferred embodiment, the bottom limiting ring 5 is connected to the two lower limiting blocks 8 by bolts, and the upper limiting ring 6 is connected to the two upper limiting blocks by bolts.

[0044] In a preferred embodiment, the inner arc of the upper connecting plate 901 and the upper docking plate 902 is in contact with the outer side of the stirring shaft 404, and the inner arc of the lower connecting plate 908 and the lower docking plate 909 is in contact with the outer side of the stirring shaft 404.

[0045] In this preferred embodiment, the drive motor 401 and the reducer 402 drive the stirring shaft 404 to rotate, which can improve the stability of the stirring shaft 404. The stirring shaft 404 is connected to the spiral stirring paddle 406 through multiple connecting plates 405, thereby realizing the upward transmission of the material inside the conical tank 1 during the stirring process, so that the material falls back into the interior of the conical tank 1 from the height, improving the stirring efficiency and reducing the occurrence of coagulation.

[0046] In this preferred embodiment, the two upper limit blocks are respectively engaged in the upper limit groove and the two lower limit blocks 8 are respectively engaged in the lower limit groove 911 to achieve the limiting connection of the upper connecting plate 901 and the upper docking plate 902, as well as the lower connecting plate 908 and the lower docking plate 909. This also prevents the upper connecting plate 901 and the upper docking plate 902, as well as the lower connecting plate 908 and the lower docking plate 909 from rotating during use. The bottom limiting ring 5 can prevent the lower connecting plate 908 and the lower docking plate 909 from sliding downwards during use, and the upper limiting ring 6 can prevent the upper connecting plate 901 and the upper docking plate 902 from sliding downwards during use, thus affecting the stability of the device.

[0047] In this embodiment, the preferred cleaning scraper 907 can scrape off the material adhering to the inner wall of the conical tank 1, thereby improving the cleanliness of the inner wall of the conical tank 1 and increasing the cleaning efficiency of the workers.

[0048] In this preferred embodiment, the material to be dried is fed into the conical tank 1 through the feed valve 12 during use of the conical vacuum mixing dryer. The drive motor 401 and reducer 402 drive the stirring shaft 404 to rotate. A sealing connector 403 mechanically seals the stirring shaft 404 to the sealed tank cover 3. The stirring shaft 404 is connected to a spiral stirring paddle 406 via multiple connecting plates 405. When the stirring shaft 404 rotates, it drives the spiral stirring paddle 406 to stir the material. The spiral stirring paddle 406 is positioned at a certain distance from the inner wall of the conical tank 1, and also at a certain distance from the cleaning scraper 907 to prevent collisions between the spiral stirring paddle 406 and the cleaning scraper 907 during rotation, thus improving the stability of the device. The outer wall of the arc-shaped bottom of the upper connecting plate 901 and the upper docking plate 902 is fixedly connected to one end of the long support arm 906. The other end of the long support arm 906 is connected to the upper end of the cleaning scraper 907. The outer wall of the arc-shaped bottom of the lower connecting plate 908 and the lower docking plate 909 is fixedly connected to one end of the short support arm 913. The other end of the short support arm 913 is connected to the lower end of the cleaning scraper 907. The outer side of the cleaning scraper 907 contacts the inner wall of the conical tank 1, thereby achieving the positioning connection of the stirring shaft 404. At the same time, the cleaning scraper 907 rotates with the stirring shaft 404. During the rotation, the material adhering to the inner wall of the conical tank 1 is scraped off, which improves the drying efficiency of the device and facilitates the subsequent cleaning of the conical tank 1.

Claims

1. A conical vacuum mixing dryer, comprising a conical tank (1), a hemispherical discharge valve (2) at the lower end of the conical tank (1), a sealing tank cover (3) at the upper end of the conical tank (1), and a stirring assembly (4), the stirring assembly (4) comprising a stirring shaft (404), characterized in that, The stirring shaft (404) is connected to the spiral stirring paddle (406) through multiple connecting plates (405). The stirring shaft (404) is also independently and detachably equipped with a bottom limiting ring (5) and an upper limiting ring (6). The spiral stirring paddle (406) is located between the bottom limiting ring (5) and the upper limiting ring (6). The spiral stirring paddle (406) does not contact the bottom limiting ring (5) and the upper limiting ring (6). The stirring shaft (404) is also independently equipped with two upper limit blocks and two lower limit blocks (8). The two upper limit blocks are connected to the upper limiting ring (6) respectively, and the two lower limit blocks (8) are connected to the bottom limiting ring (5) respectively. The two upper limit blocks and the two lower limit blocks (8) are respectively arranged vertically and vertically. The two upper limit blocks are symmetrically arranged, and the two lower limit blocks (8) are symmetrically arranged. It also includes a cleaning component (9), which is located inside the conical tank (1).

2. The conical vacuum mixing dryer as described in claim 1, characterized in that, The stirring assembly (4) includes a drive motor (401), the output end of the drive motor (401) is connected to the input end of the reducer (402), the reducer (402) is installed on the top of the cylindrical sealing connector (403), the bottom of the sealing connector (403) is integrally connected to the sealing tank cover (3), the output end of the reducer (402) is connected to the top end of the stirring shaft (404), the bottom end of the stirring shaft (404) passes through the sealing tank cover (3) and extends into the conical tank (1), the stirring shaft (404) is located at the center of the sealing tank cover (3), and the end of the stirring shaft (404) near the reducer (402) is installed in the middle of the sealing connector (403) through a bearing.

3. The conical vacuum mixing dryer as described in claim 1, characterized in that, The cleaning component (9) includes an arc-shaped upper connecting plate (901) and an upper docking plate (902). Upper limit plates (903) are provided on both sides of the opening of the upper connecting plate (901) and the upper docking plate (902). Upper limit grooves are provided in the middle of the inner wall of the arc bottom of the upper connecting plate (901) and the upper docking plate (902). The two upper limit blocks are respectively engaged and locked into the upper limit grooves. The upper limit plates (903) are secured by upper positioning bolts (905). The upper connecting plate (901) and the upper docking plate (902) are detachably connected to the stirring shaft (404). The lower surfaces of the upper connecting plate (901) and the upper docking plate (902) are in contact with the upper surface of the upper limiting ring (6). The middle of the arc-shaped bottom outer wall of the upper connecting plate (901) and the upper docking plate (902) are respectively fixedly connected to one end of the long support arm (906), and the other end of the long support arm (906) is respectively connected to the upper end of the cleaning scraper (907). The cleaning component (9) further includes a lower connecting plate (908) and a lower docking plate (909). Both sides of the opening of the lower connecting plate (908) and the lower docking plate (909) are provided with lower limiting ears (910). The inner wall of the arc-shaped bottom of both the lower connecting plate (908) and the lower docking plate (909) is provided with a lower limiting groove (911). Two lower limiting blocks (8) respectively engage with the lower limiting grooves (911). The lower limiting ears (910) are connected to the lower connecting plate (908) and the lower docking plate (909) by lower positioning bolts (912). The lower connecting plate (908) and the lower docking plate (909) are detachably connected to the stirring shaft (404). The lower surfaces of the lower connecting plate (908) and the lower docking plate (909) are in contact with the upper surface of the bottom limiting ring (5). The middle of the arc bottom outer wall of the lower connecting plate (908) and the lower docking plate (909) are respectively fixedly connected to one end of the short support arm (913). The other end of the short support arm (913) is respectively connected to the lower end of the cleaning scraper (907). The lower connecting plate (908) and the lower docking plate (909) are located below the spiral stirring paddle (406) and do not contact the spiral stirring paddle (406). The outer side of the spiral agitator (406) does not contact the inner side of the cleaning scraper (907), while the outer side of the cleaning scraper (907) contacts the inner wall of the conical tank (1).

4. The conical vacuum mixing dryer as described in claim 1, characterized in that, The lengths of the multiple connecting plates (405) decrease sequentially from top to bottom.

5. The conical vacuum mixing dryer as described in claim 1, characterized in that, The upper limit ear plate (903) is provided with a through upper bolt hole, and an upper positioning bolt (905) is installed in the upper bolt hole, so that the upper connecting plate (901) and the upper docking plate (902) can be detachably connected. The lower limit ear plate (910) is provided with a through lower bolt hole, and a lower positioning bolt (912) is installed in the lower bolt hole, so that the lower connecting plate (908) and the lower docking plate (909) can be detachably connected.

6. The conical vacuum mixing dryer as described in claim 1, characterized in that, The lower end face of the bottom limiting ring (5) is flush with the lower end face of the stirring shaft (404), and the upper end face of the upper limiting ring (6) is not flush with the upper end face of the stirring shaft (404). The upper limiting ring (6) is located inside the conical tank (1).

7. The conical vacuum mixing dryer as described in claim 1, characterized in that, The sealed tank cover (3) is also equipped with a pulse backflushing device (10).

8. The conical vacuum mixing dryer as described in claim 1, characterized in that, The sealed tank cover (3) is also independently provided with a cleaning port (11) and a feed valve (12), and the cleaning port (11) and the feed valve (12) are located on the same side as the pulse backflushing device (10).

9. The conical vacuum mixing dryer as described in claim 1, characterized in that, Multiple weighing sensors (13) are evenly arranged on the outer wall of the conical tank (1), and the multiple weighing sensors (13) are located in the upper middle position of the outer wall of the conical tank (1).

10. The conical vacuum mixing dryer as described in claim 1, characterized in that, The inner arc of the upper connecting plate (901) and the upper docking plate (902) is in contact with the outer side of the stirring shaft (404), and the inner arc of the lower connecting plate (908) and the lower docking plate (909) is in contact with the outer side of the stirring shaft (404).

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