Composite cavity self-cleaning type alkaline wastewater treatment tank and method thereof

Abstract

The invention relates to the technical field of wastewater treatment tanks, in particular to a composite cavity self-cleaning type alkaline wastewater treatment tank and a method thereof.The composite cavity self-cleaning type alkaline wastewater treatment tank comprises an outer tank body, a center heat preservation barrel is arranged on the inner wall of the outer tank body, and an inner anti-corrosion barrel is detachably installed in the center heat preservation barrel; a supporting frame is arranged above the outer tank body, a guide rail is fixedly installed on the bottom face of a top plate body of the supporting frame, a servo motor is fixedly installed at the end of the guide rail, a lead screw is fixedly installed at the tail end of an output shaft of the servo motor, a left vertical frame and a right vertical frame are arranged on the lead screw, and a left air cylinder and a right air cylinder are fixedly installed on a cross beam plate. A top cover is detachably mounted at the tail ends of telescopic shafts of the two air cylinders, a driving motor is fixedly mounted in the center of the top surface of the top cover, long shafts are fixedly mounted at the tail end of an output shaft of the driving motor, stirring blades are fixedly mounted on one long shaft, and a brush is detachably mounted on the other long shaft. The device has the effect of being convenient to clean, and manpower is saved.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment tanks, in particular to a composite cavity self-cleaning alkaline wastewater treatment tank and a method thereof. Background Art

[0002] With the rapid development of industry, the discharge of alkaline wastewater is increasing, encompassing multiple industries such as chemical, textile, and papermaking. If alkaline wastewater is discharged directly without effective treatment, it can cause serious damage to the soil, water, and other ecological environments, altering soil pH, affecting vegetation growth, leading to imbalances in aquatic ecosystems, endangering the survival of aquatic life, and potentially threatening human health through the food chain. Therefore, the efficient treatment of alkaline wastewater has become a key issue that needs to be urgently addressed in the field of environmental protection.

[0003] The patent with authorization announcement number CN118976298B discloses a self-cleaning wastewater treatment device, including a treatment tank, a drain outlet is opened at one end of the treatment tank, a filtering structure is provided in the middle of the treatment tank, the filtering structure is connected to a driving structure, a connecting structure is connected between the driving structure and the treatment tank, a closing structure is provided on the side of the treatment tank, a switching structure is connected between the closing structure and the treatment tank, and a water inlet structure is provided at the other end of the treatment tank; the filter net can be continuously cleaned by the filtering structure, the device can be automatically cleaned by the driving structure, the direction of the screening belt can be conveniently switched by the connecting structure to maintain the filtering effect, the two sides of the filter can be closed by the closing structure to facilitate the cleaning of the inside of the treatment tank, the gates on both sides can be freely controlled by the switching structure, and the height of the wastewater entry can be adjusted by the water inlet structure.

[0004] Patent publication number CN212151751U discloses a self-cleaning wastewater treatment device. The device, described in this invention, features a base and a lifting mechanism on the reactor cover to control the lifting of a rotating shaft. The lifting of the rotating shaft allows the brush head and strip brush to fully scrub the interior of the reactor, thereby completing the self-cleaning process. The nozzle flushes the reactor during the cleaning process, and after cleaning, wastewater is discharged from a drain outlet at the bottom of the reactor to prevent contamination of the outlet. During normal wastewater treatment, a catalyst carrier can be detachably connected to the rotating shaft to improve the ozone oxidation efficiency of the wastewater. Treated wastewater is discharged from an outlet on the side wall of the reactor for further water treatment.

[0005] Although the above technical solutions have corresponding advantages, most wastewater treatment tanks currently rely solely on high-pressure nozzles to flush the interior during cleaning operations. Due to the long-term use of wastewater treatment tanks, impurities on the inner wall are easily solidified, and it is difficult to achieve a good flushing effect by flushing with high-pressure water flow. Some wastewater treatment tanks also install brushes and other components inside for brushing operations. Although this can achieve a cleaner cleaning effect, the brushes cannot be easily removed and replaced, and the brushes are always fixed in the treatment tank and are easily damaged by the wastewater, affecting the use effect and causing inconvenience to the user. In view of this, we propose a composite cavity self-cleaning alkaline wastewater treatment tank and its method. Summary of the Invention

[0006] The object of the present invention is to provide a composite cavity self-cleaning alkaline wastewater treatment tank and method thereof to solve the defects mentioned in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions: One of the purposes of the present invention is to provide a composite cavity self-cleaning alkaline wastewater treatment tank, comprising an outer tank body, a central heat-insulating cylinder provided on the inner wall of the outer tank body, an inner anti-corrosion cylinder detachably mounted in the central heat-insulating cylinder, an external pipe detachably mounted on both the bottom and top cylinders of the inner anti-corrosion cylinder, a tee pipe connected to an end flange of the external pipe, and a tee pipe fixedly mounted on the tee pipe; The top of described sliding panel also is provided with an interlocking structure, and the interlocking structures of described sliding panel and the interlocking structures are interconnected.

[0008] As a preferred embodiment of the present invention, fixed bases are fixedly installed at the bottom of the left and right rod bodies of the support frame, and the fixed bases are fixedly installed on an external base.

[0009] As a preferred embodiment of the present invention, steel plates are fixedly mounted on the bottom ends of the left and right rods of the vertical frame, and the crossbeam plate is detachably mounted on the bottom surface of the steel plate by a plurality of fastening bolts.

[0010] As a preferred embodiment of the present invention, a bolt plate is fixedly mounted on the end of the telescopic shaft of the cylinder, and the top cover is detachably mounted on the bottom surface of the bolt plate by a plurality of fastening bolts.

[0011] As a preferred embodiment of the present invention, a brush rod is fixedly mounted on the brush, the cross section of the brush rod is U-shaped, and fixed sleeves are fixedly mounted on both ends of the brush rod, and the fixed sleeves are sleeved on the corresponding long axis and are detachably connected to the long axis by fastening bolts; This setting facilitates the fixed installation, removal and replacement of the brush.

[0012] As a preferred embodiment of the present invention, a plurality of supporting legs are fixedly installed on the bottom of the outer tank body, a fixed support is fixedly installed on the bottom end of the supporting legs, and the fixed support is fixedly installed on the external base.

[0013] As a preferred embodiment of the present invention, a top ring is fixedly installed on the top of the outer tank body, an upper ring is fixedly installed on the top of the inner anti-corrosion cylinder, a plurality of positioning pins are fixedly installed on the top surface of the top ring, a plurality of plug holes are provided on the upper ring, a plurality of limiting holes are provided on the top cover, the positioning pins pass through the plug holes and the limiting holes and are plugged into and matched with the plug holes and the limiting holes; This setting can position the inner anti-corrosion cylinder and the top cover to ensure structural stability and avoid shaking.

[0014] As a preferred embodiment of the present invention, an inner smooth wear-resistant layer is provided on the inner surface of the inner anti-corrosion cylinder, and the thickness of the inner smooth wear-resistant layer is between 0.2 cm and 0.5 cm; The inner smooth wear-resistant layer of this setting can play the role of wear-resistant protection between the brush and the brush. At the same time, the smooth surface can also reduce the adhesion of impurities.

[0015] As a preferred embodiment of the present invention, through holes are provided on the bottom and top cylinders of the outer tank body and the central insulation cylinder, threaded holes are provided at corresponding positions on the inner anti-corrosion cylinder, a knob is fixedly installed on the end of the external tube, a threaded tube is fixedly installed on the end of the knob, the threaded tube passes through the through hole and is threadedly connected between the threaded holes, a clamping ring is fixedly installed on the end smooth section of the threaded tube near the knob, a sealing ring is sleeved on the threaded tube, and the clamping ring presses the sealing ring tightly on the outer surface of the inner anti-corrosion cylinder; This setting facilitates the fixed installation operation of the external pipe. At the same time, after the external pipe is disassembled, the internal anti-corrosion tube can also be disassembled, making the replacement of the worn internal anti-corrosion tube smoother.

[0016] A second object of the present invention is to provide a self-cleaning method for a composite cavity self-cleaning alkaline wastewater treatment tank, using the composite cavity self-cleaning alkaline wastewater treatment tank, specifically comprising the following steps: 1. Wastewater treatment stage: S1. First, the three-way valve is used to control the three-way pipe to guide the alkaline wastewater from the external pipe into the inner anti-corrosion cylinder. Then, the reaction liquid is added to the inner anti-corrosion cylinder. The servo motor drives the screw to rotate, driving the slider to slide on the guide rail, so that the stirring blade on the vertical frame moves to the top of the inner anti-corrosion cylinder. The cylinder pushes the top cover down, and the positioning column passes through the insertion hole of the upper ring and the limit hole of the top cover to ensure that the inner anti-corrosion cylinder and the top cover are accurately connected. At this time, the stirring blade is inserted into the inner anti-corrosion cylinder; S2, the driving motor drives the long shaft to rotate, and the stirring blades fully stir the wastewater to promote uniform reaction. After the treatment is completed, the treated water is discharged through the external pipe and three-way valve at the bottom; 2. Cleaning stage: S3, the cylinder starts to drive the stirring blade to rise and separate from the inner anti-corrosion cylinder; S4. The servo motor drives the screw again to move the long shaft with the brush to the top of the inner anti-corrosion cylinder. The cylinder lowers the top cover until the brush is inserted into the inner anti-corrosion cylinder. The drive motor drives the brush to rotate and scrub the inner wall of the inner anti-corrosion cylinder in all directions. During this process, the cleaning liquid can be circulated in and out through the external pipe. The support legs and fixed supports at the bottom of the outer tank ensure the stability of the equipment.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention realizes the insulation of the alkaline wastewater treatment process and efficient protection of the equipment by setting a composite cavity structure consisting of an outer tank body, a central insulation tube and an inner anti-corrosion tube. The central insulation tube maintains the internal reaction temperature to ensure the treatment effect. The inner anti-corrosion tube and its smooth wear-resistant layer prevent alkaline wastewater from corroding the tank body, reduce impurity adhesion, and help extend the service life of the equipment and reduce maintenance costs.

[0018] 2. The present invention realizes the automatic switching between wastewater stirring treatment and tank self-cleaning through a moving mechanism composed of a servo motor, a screw rod, a slider and a guide rail, in conjunction with components such as a cylinder, a drive motor, a stirring blade and a brush. The stirring blade can fully stir the wastewater to promote the full reaction, while the brush can clean the inside of the tank after the treatment is completed, avoiding the safety hazards and labor intensity of manual cleaning, and improving the operating efficiency and stability of the equipment.

[0019] 3. By utilizing an external pipe, a tee, and a three-way valve, combined with a removable inner anti-corrosion cartridge, this invention enables flexible control of wastewater inflow and outflow and convenient replacement of the inner cartridge. When equipment components wear, the inner cartridge can be quickly removed and replaced, enhancing equipment adaptability and ensuring continuous and efficient alkaline wastewater treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is one of the partial structural diagrams of the present invention; Figure 3 This is the second schematic diagram of the partial structure of the present invention; Figure 4 It is a structural schematic diagram of the outer tank body of the present invention; Figure 5 This is a schematic diagram of the explosion structure of the outer tank of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle; Figure 7 This is the third partial structural diagram of the present invention; The meaning of each number in the figure is: 1. Support frame; 10. Fixed base; 11. Guide rail; 12. Servo motor; 13. Screw; 14. Vertical frame; 141. Slider; 142. Steel plate; 15. Crossbeam plate; 151. Cylinder; 152. Bolt plate; 16. Top cover; 161. Limit hole; 17. Drive motor; 18. Long shaft; 181. Mixing blade; 19. Brush rod; 191. Fixed sleeve; 192. Brush; 2. Outer tank body; 20. Support legs; 21. Fixed support; 22. Central insulation tube; 23. Top ring; 231. Positioning plug; 24. Through hole; 25. External tube; 251. Knob; 252. Threaded tube; 253. Compression ring; 254. Sealing ring; 26. Tee; 261. Three-way valve; 27. Inner anti-corrosion tube; 271. Inner smooth wear-resistant layer; 28. Upper ring; 281. Connecting hole; 29. Threaded hole. DETAILED DESCRIPTION

[0021] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0023] See also Figure 1-Figure 7 , the present invention provides a technical solution: This embodiment provides a composite cavity self-cleaning alkaline wastewater treatment tank, including an outer tank body 2, on the inner wall of which a central insulation tube 22 is fixedly installed, and the central insulation tube 22 can perform insulation operations to reduce heat loss; an inner anti-corrosion tube 27 is detachably installed in the central insulation tube 22, and the inner anti-corrosion tube 27 prevents corrosion by alkaline wastewater and extends the service life of the equipment. The multi-layer tube constitutes a composite cavity structure; an external tube 25 can be detachably installed on the bottom tube and the top tube of the inner anti-corrosion tube 27, and the end flange of the external tube 25 is connected to a three-way pipe 26, and a three-way valve 261 is fixedly installed on the three-way pipe 26. The tube body of the three-way pipe 26 is used for the corresponding entry and discharge of wastewater and the entry and discharge of cleaning liquid.

[0024] In this embodiment, a support frame 1 is provided above the outer tank body 2, and a guide rail 11 is fixedly installed on the bottom surface of the top plate of the support frame 1, and a servo motor 12 is fixedly installed on the end of the guide rail 11. A screw rod 13 is fixedly installed on the end of the output shaft of the servo motor 12, and the screw rod 13 is located in the guide rail 11. Two symmetrical vertical frames 14 are provided on the screw rod 13. Two symmetrical sliders 141 are fixedly installed on the top surface of the vertical frame 14. The screw rod 13 passes through the slider 141 and is threadedly connected to the slider 141. The slider 141 is slidably connected to the guide rail 11. A cross beam 15 is fixedly installed on the bottom of the vertical frame 14, and two left and right vertical frames 14 are fixedly installed on the cross beam 15. The cylinders 151 are symmetrical to each other, and the ends of the telescopic shafts of the two cylinders 151 are detachably mounted with top covers 16. A drive motor 17 is fixedly mounted at the center of the top surface of the top cover 16. A long shaft 18 is fixedly mounted at the end of the output shaft of the drive motor 17. A stirring blade 181 is fixedly mounted on one of the long shafts 18, and a brush 192 is detachably mounted on the other long shaft 18. The servo motor 12 drives the screw rod 13 to rotate, driving the slider 141 to slide on the guide rail 11 to achieve horizontal movement of the vertical frame 14. The cylinder 151 controls the lifting and lowering of the top cover 16 to ensure that the stirring blade 181 or the brush 192 can accurately enter the inner anti-corrosion cylinder 27 to perform corresponding operations, thereby improving processing and cleaning efficiency. It is worth noting that the drive motor 17, long shaft 18, stirring blades 181, and brush 192 enable efficient wastewater mixing and tank cleaning. The drive motor 17 rotates the long shaft 18, while the stirring blades 181 thoroughly stir the wastewater, promoting a uniform reaction. The brush 192 scrubs the inner wall to remove dirt, achieving self-cleaning and reducing maintenance costs.

[0025] like Figure 1 and Figure 4 As shown, the bottoms of the left and right rods of the support frame 1 are each fixedly mounted with a fixed base 10, which is fixedly mounted on an external base. The bottom of the outer tank 2 is fixedly mounted with multiple support legs 20, and the bottom ends of the support legs 20 are fixedly mounted with fixed supports 21, which are fixedly mounted on the external base, ensuring a stable installation of the entire device. The fixed base 10 and fixed supports 21 secure the device to the external base, providing stable support and ensuring that the device does not shake or move during operation, ensuring safe and reliable operation.

[0026] like Figure 3 As shown, steel plates 142 are fixedly installed at the bottom ends of the left and right rods of the vertical frame 14, and the crossbeam plate 15 is detachably installed on the bottom surface of the steel plate 142 by a plurality of fastening bolts; a bolt plate 152 is fixedly installed at the end of the telescopic shaft of the cylinder 151, and the top cover 16 is detachably installed on the bottom surface of the bolt plate 152 by a plurality of fastening bolts, which facilitates fixed installation and disassembly and replacement operations.

[0027] like Figure 3 As shown, a brush rod 19 is fixedly installed on the brush 192. The cross-section of the brush rod 19 is U-shaped. Fixed sleeves 191 are fixedly installed on both ends of the brush rod 19. The fixed sleeves 191 are sleeved on the corresponding long axis 18 and are detachably connected to the long axis 18 by fastening bolts, which facilitates the fixed installation and disassembly and replacement operations of the brush 192.

[0028] Furthermore, a top ring 23 is fixedly mounted on the top of the outer tank body 2, and an upper ring 28 is fixedly mounted on the top of the inner anti-corrosion cylinder 27. A plurality of positioning pins 231 are fixedly mounted on the top surface of the top ring 23. A plurality of insertion holes 281 are provided on the upper ring 28, and a plurality of limiting holes 161 are provided on the top cover 16. The positioning pins 231 pass through the insertion holes 281 and the limiting holes 161 and are plugged into and engaged with the insertion holes 281 and the limiting holes 161, so that the inner anti-corrosion cylinder 27 and the top cover 16 are accurately positioned and structurally stable. The positioning pins 231 pass through the insertion holes 281 and the limiting holes 161 to prevent the inner anti-corrosion cylinder 27 and the top cover 16 from shaking during operation, ensuring the stability and reliability of the stirring and cleaning process.

[0029] like Figure 5As shown, an inner smooth wear-resistant layer 271 is provided on the inner surface of the inner anti-corrosion tube 27. The thickness of the inner smooth wear-resistant layer 271 is between 0.2cm and 0.5cm, so that the inner anti-corrosion tube 27 is both wear-resistant and reduces the adhesion of impurities. The thickness of the inner smooth wear-resistant layer 271 is 0.2cm~0.5cm. When combined with the brush 192, it can reduce wear and extend the service life. At the same time, the smooth surface reduces the deposition of impurities and improves the cleaning effect and processing efficiency.

[0030] The screw threaded tube 252 is screwed to the screw threaded hole 29, and the screw threaded hole 29 is screwed to the screw threaded hole 29.

[0031] Finally, it should be noted that the servo motor 12, cylinder 151, drive motor 17 and other components involved in the present invention are all universal standard parts or components known to those skilled in the art. Their structures and principles are known to those skilled in the art through technical manuals or through conventional experimental methods. In the idle space of this device, all the above-mentioned electrical components, which refer to power elements, electrical components, and adapted controllers and power supplies, are connected through wires. The specific connection means should refer to the working principle of the present invention. The electrical connection between each electrical component is completed in a sequential working order, and the detailed connection means are all well-known technologies in the art.

[0032] In addition, the present invention also provides a self-cleaning method for a composite cavity self-cleaning alkaline wastewater treatment tank, using the above composite cavity self-cleaning alkaline wastewater treatment tank, specifically comprising the following steps: 1. Wastewater treatment stage: S1. First, the three-way valve 261 is used to control the three-way pipe 26 to introduce the alkaline wastewater from one of the tube bodies in the upper three-way pipe 26 and the upper external pipe 25 into the inner anti-corrosion cylinder 27, and then the reaction liquid is added into the inner anti-corrosion cylinder 27. After the addition is completed, the servo motor 12 drives the screw 13 to rotate, driving the slider 141 to slide on the guide rail 11, so that the stirring blade 181 at the vertical frame 14 moves to the top of the inner anti-corrosion cylinder 27. The cylinder 151 pushes the top cover 16 down, and the positioning column 231 passes through the insertion hole 281 of the upper ring 28 and the limiting hole 161 of the top cover 16 to ensure that the inner anti-corrosion cylinder 27 and the top cover 16 are accurately docked. At this time, the stirring blade 181 is inserted into the inner anti-corrosion cylinder 27; S2, the driving motor 17 drives the long shaft 18 to rotate, and the stirring blades 181 fully stir the wastewater to promote uniform reaction. After the treatment is completed, the treated water is discharged through the external pipe 25 and the three-way valve 261 at the bottom; 2. Cleaning stage: S3, the cylinder 151 is started to drive the stirring blade 181 to rise and separate from the inner anti-corrosion cylinder 27; S4, the servo motor 12 drives the screw 13 again, so that the long shaft 18 with the brush 192 moves to the top of the inner anti-corrosion cylinder 27, and the cylinder 151 lowers the top cover 16 until the brush 192 is inserted into the inner anti-corrosion cylinder 27. The drive motor 17 drives the brush 192 to rotate, and the inner wall of the inner anti-corrosion cylinder 27 is scrubbed in all directions. During this process, the cleaning liquid can be circulated in and out through the external pipe 25. The support legs 20 and fixed supports 21 at the bottom of the outer tank body 2 ensure the stability of the equipment; 3. Disassembly and replacement of the inner anti-corrosion cylinder: S5. First, stop the operation of the wastewater treatment system, close all relevant valves, and drain the residual liquid in the inner anti-corrosion cylinder 27 through the external pipe 25 and the three-way valve 261 at the bottom to ensure the safety of the disassembly process; S6. Remove the external tube 25. Use a tool to rotate the knob 251 at the end of the external tube 25 to separate the threaded tube 252 from the threaded hole 29 on the inner anti-corrosion tube 27, thereby removing the external tube 25 from the inner anti-corrosion tube 27. At the same time, the clamping ring 253 and the sealing ring 254 are also separated from the outer surface of the inner anti-corrosion tube 27. Then start the servo motor 12 to drive the screw rod 13 to rotate, driving the slider 141 to slide on the guide rail 11, moving the vertical frame 14 to one side, thereby removing the top cover 16 from above the inner anti-corrosion tube 27, and then directly lift the inner anti-corrosion tube 27 upwards to separate it from the outer tank body 2 and the central insulation tube 22 to complete the disassembly.

[0033] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite cavity self-cleaning alkaline wastewater treatment tank, comprising an outer tank body (2), characterized in that: A central heat-insulating cylinder (22) is provided on the inner wall of the outer tank body (2), an inner anti-corrosion cylinder (27) is detachably mounted in the central heat-insulating cylinder (22), an external pipe (25) is detachably mounted on both the bottom cylinder and the top cylinder of the inner anti-corrosion cylinder (27), an end flange of the external pipe (25) is connected to a three-way pipe (26), and a three-way valve (261) is fixedly mounted on the three-way pipe (26); A support frame (1) is provided above the outer tank body (2), a guide rail (11) is fixedly installed on the bottom surface of the top plate of the support frame (1), a servo motor (12) is fixedly installed at the end of the guide rail (11), a screw rod (13) is fixedly installed at the end of the output shaft of the servo motor (12), the screw rod (13) is located in the guide rail (11), two mutually symmetrical vertical frames (14) are provided on the screw rod (13), two mutually symmetrical sliders (141) are fixedly installed on the top surface of the vertical frame (14), the screw rod (13) passes through the slider (141) and is threadedly connected to the slider (141). The slider (141) is slidably connected to the guide rail (11), a crossbeam (15) is fixedly mounted on the bottom of the vertical frame (14), two symmetrical cylinders (151) are fixedly mounted on the crossbeam (15), top covers (16) are detachably mounted on the ends of the telescopic shafts of the two cylinders (151), a driving motor (17) is fixedly mounted at the center of the top surface of the top cover (16), a long shaft (18) is fixedly mounted on the end of the output shaft of the driving motor (17), a stirring blade (181) is fixedly mounted on one of the long shafts (18), and a brush (192) is detachably mounted on the other long shaft (18).

2. The composite cavity self-cleaning alkaline wastewater treatment tank according to claim 1, characterized in that: The bottoms of the left and right rods of the support frame (1) are both fixedly mounted with fixed bases (10), and the fixed bases (10) are fixedly mounted on an external base.

3. The composite cavity self-cleaning alkaline wastewater treatment tank according to claim 1, characterized in that: Steel plates (142) are fixedly mounted on the bottom ends of the left and right rod bodies of the vertical frame (14), and the crossbeam plate (15) is detachably mounted on the bottom surface of the steel plate (142) via a plurality of fastening bolts.

4. The composite cavity self-cleaning alkaline wastewater treatment tank according to claim 1, characterized in that: A bolt plate (152) is fixedly mounted on the end of the telescopic shaft of the cylinder (151), and the top cover (16) is detachably mounted on the bottom surface of the bolt plate (152) via a plurality of fastening bolts.

5. The composite cavity self-cleaning alkaline wastewater treatment tank according to claim 1, characterized in that: A brush rod (19) is fixedly mounted on the brush (192), the cross section of the brush rod (19) being U-shaped, and fixed sleeves (191) are fixedly mounted on both ends of the brush rod (19), the fixed sleeves (191) being sleeved on the corresponding long shaft (18) and being detachably connected to the long shaft (18) via fastening bolts.

6. The composite cavity self-cleaning alkaline wastewater treatment tank according to claim 1, characterized in that: A plurality of support legs (20) are fixedly mounted on the bottom of the outer tank body (2), a fixed support (21) is fixedly mounted on the bottom end of the support leg (20), and the fixed support (21) is fixedly mounted on the external base.

7. The composite cavity self-cleaning alkaline wastewater treatment tank according to claim 1, characterized in that: A top ring (23) is fixedly mounted on the top of the outer tank body (2), an upper ring (28) is fixedly mounted on the top of the inner anti-corrosion cylinder (27), a plurality of positioning pins (231) are fixedly mounted on the top surface of the top ring (23), a plurality of plug holes (281) are provided on the upper ring (28), a plurality of limiting holes (161) are provided on the top cover (16), and the positioning pins (231) pass through the plug holes (281) and the limiting holes (161) and are plugged into and fitted between the plug holes (281) and the limiting holes (161).

8. The composite cavity self-cleaning alkaline wastewater treatment tank according to claim 1, characterized in that: An inner smooth wear-resistant layer (271) is provided on the inner surface of the inner anti-corrosion cylinder (27), and the thickness of the inner smooth wear-resistant layer (271) is between 0.2 cm and 0.5 cm.

9. The composite cavity self-cleaning alkaline wastewater treatment tank according to claim 1, characterized in that: The outer tank body (2) and the central heat-insulating tube (22) are both provided with through holes (24) on the bottom and top cylinders, and the inner anti-corrosion tube (27) is provided with threaded holes (29) at corresponding positions. The end of the external tube (25) is fixedly mounted with a knob (251), and the end of the knob (251) is fixedly mounted with a threaded tube (252). The threaded tube (252) passes through the through hole (24) and is threadedly connected to the threaded hole (29). A clamping ring (253) is fixedly mounted on the smooth section of the end of the threaded tube (252) near the knob (251). A sealing ring (254) is sleeved on the threaded tube (252), and the sealing ring (254) is pressed against the outer surface of the inner anti-corrosion tube (27) by the clamping ring (253).

10. A self-cleaning method for a composite cavity self-cleaning alkaline wastewater treatment tank, using the composite cavity self-cleaning alkaline wastewater treatment tank according to any one of claims 1 to 9, characterized in that: The specific steps include:

1. Wastewater treatment stage: S1. First, the three-way valve (261) is used to control the three-way pipe (26) to guide the alkaline wastewater from the external pipe (25) into the inner anti-corrosion cylinder (27), and then the reaction liquid is added into the inner anti-corrosion cylinder (27). The servo motor (12) drives the screw (13) to rotate, driving the slider (141) to slide on the guide rail (11), so that the stirring blade (181) at the vertical frame (14) moves to the top of the inner anti-corrosion cylinder (27). The cylinder (151) pushes the top cover (16) down, and the positioning column (231) passes through the plug hole (281) of the upper ring (28) and the limit hole (161) of the top cover (16) to ensure that the inner anti-corrosion cylinder (27) and the top cover (16) are accurately docked. At this time, the stirring blade (181) is inserted into the inner anti-corrosion cylinder (27); S2, the driving motor (17) drives the long shaft (18) to rotate, and the stirring blades (181) fully stir the wastewater to promote uniform reaction. After the treatment is completed, the treated water is discharged through the external pipe (25) and the three-way valve (261) at the bottom; 2. Cleaning stage: S3, the cylinder (151) is started to drive the stirring blade (181) to rise until it is separated from the inner anti-corrosion cylinder (27); S4, the servo motor (12) drives the screw (13) again, so that the long shaft (18) with the brush (192) moves to the top of the inner anti-corrosion cylinder (27), and the cylinder (151) lowers the top cover (16) until the brush (192) is inserted into the inner anti-corrosion cylinder (27). The driving motor (17) drives the brush (192) to rotate, and the inner wall of the inner anti-corrosion cylinder (27) is scrubbed in all directions. During this process, the cleaning liquid can be circulated and introduced and discharged through the external pipe (25). The support legs (20) and fixed supports (21) at the bottom of the outer tank body (2) ensure the stability of the equipment.

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