Sewage treatment device

Abstract

The utility model discloses a sewage treatment device which is characterized by comprising a box body with a cavity inside, and a water inlet and a water outlet are formed in the side wall of the box body; a fixed pore plate is arranged above the cavity, a movable pore plate is arranged below the cavity, a filler space is formed between the fixed pore plate and the movable pore plate, and a sponge filter material is placed in the filler space; a driving device for driving the movable pore plate to vertically move is further arranged, the driving device comprises at least two screw rods and a driving part for simultaneously driving the plurality of screw rods to vertically move, the driving part is mounted at the top of the box body, and the bottom of each screw rod is fixedly connected with the movable pore plate; a telescopic protective sleeve is further arranged outside each screw rod, the bottom of each telescopic protective sleeve is connected with the corresponding movable pore plate, and the top of each telescopic protective sleeve is connected with the corresponding fixed pore plate. The occupied space is reduced, and the sewage treatment effect is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment, and more particularly to a wastewater treatment device. Background Technology

[0002] The A2O process, also known as the AAO process, is a commonly used secondary wastewater treatment process for nitrogen and phosphorus removal. Its flow is quite simple, consisting of an anaerobic tank, an anoxic tank, an aerobic tank, and a sedimentation tank. The anaerobic tank primarily releases phosphorus and ammonifies some organic matter; the anoxic tank mainly removes nitrogen; and the aerobic tank removes BOD, nitrifies, and absorbs phosphorus. This process can effectively remove 90%-95% of BOD5 (organic matter) and SS (suspended solids), as well as over 70% of total nitrogen and approximately 90% of phosphorus.

[0003] While traditional A2O processes offer good nitrogen and phosphorus removal, they also suffer from drawbacks such as long process flows, large footprints, numerous treatment structures, sludge recirculation, and complex on-site operations. Conventional biological activated sludge technology suffers from low sludge concentration and poor settling properties, resulting in large effluent footprints and generally poor effluent quality, making it difficult to directly meet the Class A discharge standard of the Municipal Wastewater Treatment Plant Pollutant Discharge Standard (GB 18918—2002). While ultramagnetic separation can remove particulate COD (Chemical Oxygen Demand), TN (Total Nitrogen), and TP (Total Phosphorus), it does not remove dissolved COD, ammonia nitrogen, or Kjeldahl nitrogen. Therefore, further cleaning of wastewater after ultramagnetic separation while minimizing space requirements and reducing costs is a direction that those skilled in the art need to explore. Summary of the Invention

[0004] The purpose of this invention is to provide a wastewater treatment device that effectively reduces space occupation, lowers costs, reduces maintenance rates, and prevents the loss of sponge filter media.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a sewage treatment device, comprising a box having an internal chamber, wherein an inlet and an outlet communicating with the chamber are respectively provided on the lower and upper sides of the side wall of the box.

[0006] A fixed perforated plate is provided above the chamber, and a movable perforated plate is provided below the chamber. The fixed perforated plate and the movable perforated plate form a filling space, and sponge filter material is placed in the filling space.

[0007] It is also provided with a driving device for driving the movable perforated plate to move vertically. The driving device includes at least two screws and a driving part that drives multiple screws to move up and down at the same time. The driving part is installed on the top of the housing. The bottom of each screw is fixedly connected to the movable perforated plate. The top of each screw passes through the fixed perforated plate and the top of the housing respectively and is located above the top of the housing and connected to the driving part.

[0008] Each screw is further provided with a telescopic sleeve on its outside. The bottom of the telescopic sleeve is connected to the movable hole plate, and the top of the telescopic sleeve is connected to the fixed hole plate.

[0009] In the above technical solution, the telescopic sleeve includes at least two sleeves, the bottom of the upper sleeve is inserted into the adjacent lower sleeve, the top of the topmost sleeve is connected to the fixed hole plate, and the bottom of the bottommost sleeve is connected to the movable hole plate.

[0010] In the above technical solution, a protective positioning component is provided between adjacent sheaths. The protective positioning component includes a first sealing sleeve and a second sealing sleeve. The first sealing sleeve is installed on the bottom outer surface of the upper sheath, and the second sealing sleeve is installed on the top inner surface of the lower sheath. The second sealing sleeve is positioned above the first sealing sleeve.

[0011] The outer surface of the upper sheath contacts the inner surface of the second sealing sleeve; the outer surface of the first sealing sleeve contacts the inner surface of the lower sheath.

[0012] In the above technical solution, a vertical guide rail is provided on at least two inner walls of the chamber, and a sliding groove matching the vertical guide rail is provided on the outer edge of the movable orifice plate, and the movable orifice plate is slidably connected to the vertical guide rail via the sliding groove.

[0013] In the above technical solution, there is a gap between the outer edge of the movable perforated plate and the inner wall of the chamber;

[0014] A flexible plate is also installed at the outer edge of the movable perforated plate, and the outer surface of the flexible plate is in contact with the inner wall of the chamber; the sliding groove is disposed on the flexible plate.

[0015] In the above technical solution, at least one guide wheel is rotatably mounted on each side of the bottom of the movable perforated plate, and the outer surface of the guide wheel abuts against the inner wall of the corresponding side of the chamber.

[0016] In the above technical solution, the water inlet is located below the movable orifice plate, and the water outlet is located above the fixed orifice plate;

[0017] A drain pipe is arranged in the chamber, and the water inlet is connected to the drain pipe. The drain pipe is located below the movable orifice plate and is positioned near the bottom of the chamber.

[0018] In the above technical solution, the drain pipe includes a main pipe and multiple branch pipes. The inlet is connected to the main pipe, and the multiple branch pipes are respectively arranged at intervals on both sides of the main pipe. The inner end of the branch pipe is connected to the main pipe, and multiple outlet holes are arranged at the top and bottom of the branch pipe.

[0019] And / or, the outer wall of the housing is also provided with a cleaning and drainage port that communicates with the chamber, and the cleaning and drainage port is located near the bottom of the chamber.

[0020] In the above technical solution, a nut that is screwed to the screw is rotatably installed on the top of the housing. The driving part includes a drive motor and a transmission component. The drive motor is installed on the top of the housing and drives multiple nuts to rotate synchronously via the transmission component.

[0021] In the above technical solution, the top wall of the box is a perforated plate, and the drive unit is mounted on the perforated plate;

[0022] And / or, a ladder is provided on the side wall of the box, a guardrail is provided at the top outer edge of the box, and a notch is provided on one side of the guardrail facing the ladder.

[0023] In the above technical solution, the top of the housing is provided with a sleeve that matches the screw. Each sleeve is sleeved on the outside of one of the screws. The bottom of the sleeve is installed on the top surface of the housing. Photoelectric sensors facing the inside of the sleeve are installed above and below the sleeve, respectively. The photoelectric sensors are electrically connected to the drive unit.

[0024] Due to the application of the above-mentioned technical solution, the present invention has the following advantages compared with the prior art:

[0025] 1. In this invention, a fixed perforated plate and a movable perforated plate are set in the chamber, and a sponge filter media with corresponding bacteria is set between the fixed perforated plate and the movable perforated plate to treat the sewage, so that it has strong biochemical treatment and filtration capabilities, can simultaneously remove organic matter, total nitrogen and suspended solids in the sewage, and can reduce space occupation and reduce costs.

[0026] 2. In this invention, a movable perforated plate is used. The moving screw is driven by the driving unit to move the movable perforated plate closer to or away from the fixed perforated plate. This allows the movable perforated plate and the fixed perforated plate to squeeze the sponge filter material. The sludge in the sponge filter material is discharged by squeezing. There is no need to use a sedimentation tank design, which can effectively reduce space occupation and improve sewage treatment efficiency.

[0027] 3. In this invention, a telescopic sleeve is provided on the outside of the screw, which can prevent the sponge filter material from leaking out of the screw's spiral groove, prevent the loss of the sponge filter material, ensure sewage treatment efficiency, reduce costs, and also prevent the sponge filter material from clogging the screw's spiral groove, causing the screw to move sluggishly, thus reducing the maintenance rate.

[0028] 4. In this invention, not only is the movement and guidance of the movable orifice plate driven by the screw, but the vertical guide rail and slide groove are also used to guide and limit the movement of the movable orifice plate. Furthermore, the guide wheel is set to effectively ensure the smoothness and stability of the movement of the movable orifice plate. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure in Embodiment 1 of the present invention;

[0030] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure;

[0031] Figure 3 This is a three-dimensional structural diagram of the top of the box in Embodiment 1 of the present invention (the perforated plate part is not shown);

[0032] Figure 4 This is a structural schematic diagram of the box body in the open state in Embodiment 1 of the invention (fixed perforated plate, movable perforated plate, and perforated plate parts are not shown);

[0033] Figure 5 yes Figure 4 A magnified view of the connection between the central vertical guide rail and the slide groove;

[0034] Figure 6 This is a partial structural diagram of the connection between the movable perforated plate and the inner wall of the cavity in Embodiment 1 of the present invention;

[0035] Figure 7 This is a cross-sectional view of the connection between adjacent sheaths in Embodiment 1 of the present invention;

[0036] Figure 8 This is a schematic diagram of the drainage pipe in Embodiment 1 of the present invention.

[0037] The components are as follows: 1. Chamber; 2. Box body; 3. Inlet; 4. Outlet; 5. Fixed orifice plate; 6. Moving orifice plate; 7. Filler space; 8. Screw; 9. Telescopic sleeve; 10. Cleaning and drain outlet; 11. Sealing cover; 12. Sleeve; 13. First sealing sleeve; 14. Second sealing sleeve; 15. Vertical guide rail; 16. Slide groove; 17. Flexible plate; 18. Guide wheel; 19. Drain pipe; 20. Main pipe; 21. Branch pipe; 22. Outlet hole; 23. Drive motor; 24. Intermediate transmission rod; 25. Front transmission rod; 26. Rear transmission rod; 27. Orifice plate; 28. Ladder; 29. ​​Sleeve; 30. Photoelectric sensor; 31. Guardrail. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0039] Example 1: See Figures 1-8 As shown, a sewage treatment device includes a box 2 with an internal chamber 1. The box 2 has an inlet 3 and an outlet 4 communicating with the chamber 1, respectively, on the lower and upper sides of its side wall.

[0040] A fixed perforated plate 5 is provided above the chamber 1, and a movable perforated plate 6 is provided below the chamber 1. The fixed perforated plate 5 and the movable perforated plate 6 form a filling space 7, and a sponge filter material (not shown in the figure) is placed in the filling space 7.

[0041] It is also provided with a driving device for driving the movable perforated plate 6 to move vertically. The driving device includes at least two screws 8 and a driving part that simultaneously drives multiple screws 8 to move up and down. The driving part is installed on the top of the housing 2. The bottom of each screw 8 is fixedly connected to the movable perforated plate 6. The top of each screw 8 passes through the fixed perforated plate 5 and the top of the housing 2, and is located above the top of the housing 2 and connected to the driving part.

[0042] Each screw 8 is further provided with a telescopic sleeve 9 on its outside. The bottom of the telescopic sleeve 9 is connected to the movable hole plate 6, and the top of the telescopic sleeve 9 is connected to the fixed hole plate 5.

[0043] Different types of bacteria can grow on the sponge filter media. In the filter layer closer to the inlet (i.e., the water inlet end), the organic matter content of the wastewater is higher, and denitrifying bacteria are dominant. Under anaerobic conditions, denitrifying bacteria multiply rapidly, converting nitrate nitrogen in the wastewater into nitrogen gas for removal, thus achieving denitrification. Therefore, in this invention, the sponge filter media contains denitrifying bacteria. These bacteria have strong adhesion to the sponge filter media and, once formed, are not easily detached. Therefore, during use, wastewater enters the chamber through the inlet, submerging the sponge filter media. After filtration by the sponge filter media, the wastewater is discharged through the outlet. In this process, the use of sponge filter media, with its larger specific surface area, provides a better growth environment for microorganisms, facilitating biofilm formation and stable operation. It maintains a high biomass both on and within the sponge filter media, resulting in a much higher microbial density per unit volume compared to activated sludge processes (reaching 10-15 g / L). This high concentration of microorganisms increases the volumetric load of the tank, reducing the required tank volume and floor space, thus significantly lowering infrastructure costs. Furthermore, during denitrification using denitrifying bacteria, the sponge filter media's strong mechanical retention and the adsorption effect of microorganisms and metabolically produced viscous substances on its surface result in very low SS (suspended solids) levels in the effluent, generally not exceeding 10 mg / L. This eliminates the need for a secondary sedimentation tank, further reducing infrastructure costs. It not only denitrifies but also effectively removes organic matter and suspended solids from wastewater.

[0044] In this embodiment, since the sponge filter media has an upper limit to its adsorption capacity, it cannot adsorb any more sludge after adsorbing a certain amount. To quickly remove the sludge, minimize manual intervention, avoid adding more sponge filter media and corresponding bacteria, and prevent leakage from the drain outlet, a fixed perforated plate and a movable perforated plate are provided. The fixed perforated plate is fixedly installed on the upper inner wall of the chamber, while the movable perforated plate is vertically moved within the chamber below the fixed perforated plate. Both the fixed and movable perforated plates have permeable holes for water flow, and the size of these holes is smaller than the size of the compressed sponge filter media. When sludge needs to be discharged, the drive unit drives the screw upwards, simultaneously moving the movable perforated plate upwards, reducing the distance between the fixed and movable perforated plates. The elasticity of the sponge filter media itself, along with the compressive force between the movable and fixed perforated plates, compresses the sponge filter media, discharging the sludge and restoring its original performance, allowing it to continue wastewater treatment (the denitrifying bacteria within the sponge filter media remain). After the sludge is squeezed out of the sponge filter media, the drive unit drives the screw to move downwards, which in turn moves the moving orifice plate downwards to detach from the fixed orifice plate. Due to gravity and its elastic recovery properties, the sponge filter media falls and returns to its original shape, waiting for the next batch of sewage to enter the chamber for sewage filtration.

[0045] In this system, after the moving and fixed perforated plates squeeze the sludge out of the sponge filter media, the sludge falls downwards to the bottom of the chamber. To prevent subsequent wastewater from entering the chamber and causing the sludge to be discharged from the outlet or reabsorbed by the sponge filter media, a cleaning and drain outlet 10 communicating with the chamber 1 is provided on the outer wall of the housing. The cleaning and drain outlet 10 is located near the bottom of the chamber 1. After the sludge is squeezed out of the sponge filter media and falls to the bottom of the chamber, it can be cleaned through the cleaning and drain outlet. Furthermore, since the amount of sludge is relatively large, the cleaning and drain outlet can be a cleaning and drain outlet with a gate, or a larger cleaning and drain outlet that allows personnel to enter and exit. A removable sealing cover 11 is provided on it for opening or closing the cleaning and drain outlet.

[0046] A cleaning and drainage outlet with a gate is used. This structure requires flushing a certain amount of water into the inlet to wash away the sludge at the bottom of the chamber. Then, the gate is opened, and the sludge and water are discharged through the cleaning and drainage outlet. Because the sludge is quite heavy, water may not be able to wash it away completely. Therefore, a cleaning and drainage outlet that allows personnel access can be used, equipped with a sealed cover. Operators open the sealed cover and enter the chamber through the cleaning and drainage outlet to manually clean the sludge at the bottom of the chamber, thereby improving the cleaning effect.

[0047] More preferably, there are two drainage outlets. One drainage outlet has a valve, which is relatively small in size. The other drainage outlet has a sealing cap, which is larger in size, to facilitate the entry and exit of cleaning personnel. Therefore, it can both drain water and facilitate the entry and exit of personnel to clean up sludge.

[0048] Meanwhile, in this embodiment, since a screw is used to lift the moving orifice plate, and the outer surface of the screw has threads and a threaded groove beside the threads, and because the size of the housing is relatively large, in order to lift the moving orifice plate, ensure the strength of the screw, and prevent it from breaking, the diameter of the screw is relatively large, and the size of the threaded groove is also relatively large. The sponge filter material is an elastic material, and it may enter the threaded groove. As a result, the upward-moving screw will carry the sponge filter material out of the chamber simultaneously, causing the loss of the sponge filter material, which in turn affects the efficiency and effect of sewage treatment.

[0049] See Figure 4 , 7 As shown, the telescopic sleeve 9 includes at least two sleeves 12. The bottom of the upper sleeve 12 is inserted into the adjacent lower sleeve 12. The top of the uppermost sleeve 12 is connected to the fixed hole plate 5, and the bottom of the lowermost sleeve 12 is connected to the movable hole plate 6.

[0050] In this embodiment, since the distance between the moving orifice plate and the fixed orifice plate decreases when the moving orifice plate moves upward and increases when the moving orifice plate moves downward, a telescopic sleeve is used. The upper sleeve is inserted into the lower sleeve, and the two can move axially relative to each other. The inner diameter of the lower sleeve is larger than the outer diameter of the upper sleeve, thus ensuring the telescopic sleeve can extend and retract during the movement of the moving orifice plate. When the moving orifice plate moves upward, the bottommost sleeve moves upward, which may simultaneously push the upper sleeve upward, or after the bottommost sleeve moves upward to a certain position, another sleeve above the bottommost sleeve abuts against the moving orifice plate, and the moving orifice plate continues to push that sleeve upward until the moving orifice plate moves to its upper position. When the moving orifice plate moves downward, it will drive the bottommost sleeve downward. After the bottommost sleeve moves downward to a certain position, it will pull the upper sleeve downward, or other methods can be used to achieve the extension and retraction of the telescopic sleeve. In this method, the telescopic sleeve is set outside the screw, so that the sponge filter material will not come into contact with the screw, preventing the screw from carrying the sponge filter material out of the chamber when the moving orifice plate moves up (that is, there is no need to frequently check whether the sponge filter material is lacking and to carry out maintenance and add sponge filter material, thus reducing the maintenance rate).

[0051] See Figure 7 As shown, a protective positioning member is provided between adjacent sheaths 12. The protective positioning member includes a first sealing sleeve 13 and a second sealing sleeve 14. The first sealing sleeve 13 is installed on the bottom outer surface of the upper sheath 12, and the second sealing sleeve 14 is installed on the top inner surface of the lower sheath 12. The second sealing sleeve 14 is positioned above the first sealing sleeve 13.

[0052] The outer surface of the upper sheath 12 is in contact with the inner surface of the second sealing sleeve 14; the outer surface of the first sealing sleeve 13 is in contact with the inner surface of the lower sheath 12.

[0053] In this embodiment, both the first and second sealing sleeves are made of elastic materials, such as rubber. The inner surface of the first sealing sleeve is fixedly connected to the outer surface of the upper sleeve, while its outer surface is in close contact with the inner surface of the lower sleeve. The outer surface of the second sealing sleeve is fixedly connected to the top inner surface of the lower sleeve, while its inner surface is in close contact with the outer surface of the upper sleeve. This not only blocks the gap between the two adjacent sleeves, preventing the sponge filter material from entering the sleeve and being carried out by the screw, but also serves as an axial movement limiter. When the moving orifice plate moves downwards and drives the lower sleeve downwards, the sealing contact between the corresponding sealing sleeve and the sleeve synchronously drives the upper sleeve to move accordingly. Even if it does not move, after the first and second sealing sleeves come into contact, when the lower sleeve moves downwards, the limit between the first and second sealing sleeves pulls the upper sleeve downwards, preventing the two sleeves from separating and ensuring the connection effect.

[0054] See Figure 4 , 5 As shown, at least two inner walls of the chamber 1 are provided with a vertical guide rail 15, and the outer edge of the movable perforated plate 6 is provided with a sliding groove 16 that matches the vertical guide rail 15. The movable perforated plate 6 is slidably connected to the vertical guide rail 15 via the sliding groove 16.

[0055] There is a gap between the outer edge of the movable perforated plate 6 and the inner wall of the chamber 1;

[0056] A flexible plate 17 is also installed at the outer edge of the movable perforated plate 6, and the outer surface of the flexible plate is in contact with the inner wall of the chamber 1; the sliding groove 16 is disposed on the flexible plate 17.

[0057] In this embodiment, the chamber is a cuboid structure with six sides: front, rear, left, right, top, and bottom. At least one vertical guide rail is provided on each of the four sides: front, rear, left, and right. The vertical guide rail is parallel to the screw. The movable orifice plate has a rectangular cross-section, and its front, rear, left, and right side walls are respectively provided with grooves that match the corresponding vertical guide rails. To ensure the strength of the housing, both the housing and the movable perforated plate are made of metal materials, such as stainless steel or iron. The housing is relatively large, making it difficult to guarantee machining precision and causing self-deformation. To ensure smooth movement of the movable perforated plate and prevent rigid friction with the inner wall of the housing during movement, the size of the movable perforated plate is slightly smaller than the cross-sectional size of the chamber. To prevent the sponge filter material from leaking out of the gap between the movable perforated plate and the chamber and falling below the movable perforated plate (as the movable perforated plate moves upward, it cannot squeeze out the sludge from the sponge filter material that has fallen below it), flexible plates are installed at its outer edges. That is, flexible plates are installed on the front, back, left, and right sides of the movable perforated plate. The outer surface of the flexible plates is in close contact with the inner wall of the chamber, confining the sponge filter material between the fixed and movable perforated plates. Simultaneously, in this embodiment, since the fixed perforated plate does not need to move, its outer surface contacts the inner wall of the chamber, preventing the sponge filter material from leaking out from above the fixed perforated plate.

[0058] Furthermore, in order to ensure that the screw is not deformed due to the radial force of the moving orifice plate during vertical movement (deformation of the screw can cause it to jam or become unable to move), a vertical guide rail and a slide are also provided to limit the movement of the moving orifice plate.

[0059] Furthermore, since the sliding groove is located on the flexible plate, its limiting effect may not be particularly strong. Therefore, at least one guide wheel 18 is rotatably mounted on each side of the bottom of the movable perforated plate 6. The outer surface of the guide wheel 18 abuts against the inner wall of the corresponding side of the chamber 1. (See [reference]) Figure 4 , 6 As shown.

[0060] In this embodiment, two guide wheels are provided at the front, rear, left, and right sides of the bottom of the movable orifice plate. The two guide wheels are spaced apart. The guide wheels ensure the stability of the movable orifice plate during vertical movement, prevent the screw from being subjected to radial force, ensure the vertical state of the screw, extend its service life, and reduce the maintenance rate.

[0061] The inlet 3 is located below the movable orifice plate 6, and the outlet 4 is located above the fixed orifice plate 5.

[0062] In this embodiment, sewage enters the chamber below the moving perforated plate from the inlet. The sewage flows upward through the permeable holes of the moving perforated plate, is first treated by the sponge filter material, and then flows out through the permeable holes of the fixed perforated plate. Finally, clean water is discharged from the outlet.

[0063] See Figure 4 , 8 As shown, a drain pipe 19 is arranged in the chamber 1, and the water inlet 3 is connected to the drain pipe 19. The drain pipe 19 is located below the movable orifice plate 6 and is located near the bottom of the chamber 1.

[0064] The drain pipe allows water supplied from the inlet to be discharged into the chamber through the drain pipe.

[0065] See Figure 8 As shown, the drain pipe 19 includes a main pipe 20 and multiple branch pipes 21. The inlet 3 is connected to the main pipe 20. The multiple branch pipes 21 are respectively arranged at intervals on both sides of the main pipe 20, and the inner end of the branch pipe 21 is connected to the main pipe 20. Multiple outlet holes 22 are respectively arranged at the top and bottom of the branch pipe 21.

[0066] In this embodiment, the main pipe is longitudinally positioned in the lower center of the chamber. Multiple branch pipes are arranged on the left and right sides of the main pipe, spaced apart from front to back. This allows wastewater to enter the chamber from various positions at the bottom, reducing the scouring of sludge settled at the bottom and extending the service life of the sponge filter media, thus increasing the frequency of bottom sludge cleaning. Furthermore, an inlet pipe and inlet are connected to the outer wall of the chamber. A tee is installed on the inlet pipe, with one port connected to the inlet and the other two ports equipped with valves. The two valved ports are connected to a wastewater outlet and a clean water outlet, respectively. The wastewater outlet is used to send wastewater into the chamber for filtration by the sponge filter media. The clean water outlet is used to send clean water into the chamber to clean the chamber after the sludge has been expelled from the sponge filter media. Simultaneously, outlet holes are provided at the top and bottom of the branch pipes. When clean water is flushed into the drain pipe, the bottom of the chamber and the moving perforated plate can be cleaned through these outlet holes.

[0067] The top of the housing 2 is rotatably mounted with a nut (not shown in the figure) that is screwed to the screw 8. The drive unit includes a drive motor 23 and a transmission component. The drive motor 23 is mounted on the top of the housing 2. The drive motor 23 drives multiple nuts to rotate synchronously through the transmission component. When the nuts rotate, they drive the screw to move up and down.

[0068] In this embodiment, four screws are provided, forming a parallelogram structure. Four nuts are also provided. The drive motor is located inside the parallelogram structure formed by the four screws. Using a combination of the drive motor and transmission components, multiple nuts are driven to rotate synchronously. In this embodiment, two screws are spaced apart and close to the front of the housing, while the other two screws are spaced apart and close to the rear of the housing. The transmission components include a middle transmission rod 24, a front transmission rod 25, and a rear transmission rod 26. The middle transmission rod is perpendicular to the front and rear transmission rods. The drive motor is connected to the middle transmission rod, driving it to rotate. The middle and both ends of the front and rear transmission rods are rotatably connected to the top of the housing. The middle transmission rod has first gears at both ends, and the middle of the front and rear transmission rods has second gears that mesh with the first gears at the ends of the middle transmission rod. When the middle transmission rod rotates, it drives the front and rear transmission rods to rotate simultaneously. Simultaneously, a third gear is provided at both ends of the front and rear transmission rods, and a fourth gear meshing with the third gear is provided on the outer surface or end face of each nut. When the front and rear transmission rods rotate, they synchronously drive the nut to rotate, and when the nut rotates, it synchronously drives the screw to move vertically. In this embodiment, the first, second, third, and fourth gears (not shown in the gear diagram) can be helical gears, spur gears, or a combination of helical and spur gears, enabling the corresponding gears to mesh with each other, so that the drive motor drives the intermediate transmission rod, the front transmission rod, and the rear transmission rod to rotate simultaneously, and synchronously drives the four screws to move vertically. Of course, a belt system can also be used, with pulleys provided on the outer surface or end of the nut, and pulleys also provided on the output shaft of the drive motor. Four belts are provided, each belt connected to the pulley at the nut and the pulley on the drive motor, respectively. When the drive motor rotates, it synchronously drives the four screws to move vertically via the belts.

[0069] See Figures 1-4 As shown, the top wall of the housing 2 is a perforated plate 27, and the drive unit is mounted on the perforated plate 27.

[0070] The top wall of the enclosure also uses a perforated plate, and the drive unit is installed on the perforated plate. When performing subsequent maintenance or checking the internal condition of the enclosure, one can stand on the perforated plate to check the internal condition of the enclosure, making it easier to detect and deal with problems in a timely manner.

[0071] See Figures 1-4 As shown, a ladder 28 is provided on the side wall of the box 2, and a guardrail 31 is provided at the top outer edge of the box 2. A notch is provided on one side of the guardrail 31 facing the ladder 28.

[0072] The enclosure is relatively tall, so a ladder and guardrails are installed on the side wall of the enclosure to facilitate maintenance and inspection. Maintenance personnel can climb the ladder and access the top of the enclosure through the gap to inspect and repair. The guardrails provide protection and ensure the safety of maintenance and operation.

[0073] See Figures 1-4 As shown, the top of the housing 2 is provided with a sleeve 29 that matches the screw 8. Each sleeve 29 is sleeved on the outside of one screw 8. The bottom of the sleeve 29 is installed on the top surface of the housing 2. Photoelectric sensors 30 are installed above and below the sleeve 29, facing the inside of the sleeve 29. The photoelectric sensors 30 are electrically connected to the drive motor 23.

[0074] In this embodiment, four sleeves are installed on the top of the housing. Photoelectric sensors are respectively installed on the upper and lower side walls of the sleeves. Holes communicating with the interior of the sleeves are opened on the sleeves, and the detection ends of the photoelectric sensors are inserted into these holes. When the drive motor moves the screw upwards, if the upper photoelectric sensor detects the screw, it indicates that the moving plate has moved to the correct position. The photoelectric sensor transmits a signal to the drive motor, causing the drive motor to pause, preventing the moving plate from continuing to move upwards. After a set time or after the next drive signal, the drive motor reverses direction, moving the screw upwards. When the lower photoelectric sensor detects the top of the screw, it transmits a signal to the drive motor, causing the drive motor to stop. At this point, the moving plate moves downwards to the predetermined position.

[0075] In this invention, the telescopic sleeve also serves to prevent sewage from contacting the screw and to prevent the screw from rusting, thereby ensuring the smooth connection between the screw and the nut, preventing jamming, and ensuring that the screw can move up and down normally.

[0076] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0077] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. For instance, the two components can be mechanically connected by contact or abutting; they can also be directly hooked or connected by an intermediate medium; or they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

Claims

1. A wastewater treatment device, characterized in that: The container includes a chamber inside, with an inlet and an outlet communicating with the chamber located on the lower and upper sides of the side wall of the container, respectively. A fixed perforated plate is provided above the chamber, and a movable perforated plate is provided below the chamber. The fixed perforated plate and the movable perforated plate form a filling space, and sponge filter material is placed in the filling space. It is also provided with a driving device for driving the movable perforated plate to move vertically. The driving device includes at least two screws and a driving part that drives multiple screws to move up and down at the same time. The driving part is installed on the top of the housing. The bottom of each screw is fixedly connected to the movable perforated plate. The top of each screw passes through the fixed perforated plate and the top of the housing respectively and is located above the top of the housing and connected to the driving part. Each screw is further provided with a telescopic sleeve on its outside. The bottom of the telescopic sleeve is connected to the movable hole plate, and the top of the telescopic sleeve is connected to the fixed hole plate.

2. The wastewater treatment device according to claim 1, characterized in that: The telescopic sleeve includes at least two sleeve sections. The bottom of the upper sleeve is inserted into the adjacent lower sleeve. The top of the uppermost sleeve is connected to the fixed hole plate, and the bottom of the lowermost sleeve is connected to the movable hole plate.

3. The wastewater treatment device according to claim 2, characterized in that: A protective positioning element is provided between adjacent sheaths. The protective positioning element includes a first sealing sleeve and a second sealing sleeve. The first sealing sleeve is installed on the bottom outer surface of the upper sheath, and the second sealing sleeve is installed on the top inner surface of the lower sheath. The second sealing sleeve is positioned above the first sealing sleeve. The outer surface of the sheath described above is in contact with the inner surface of the second sealing sleeve; The outer surface of the first sealing sleeve is in contact with the inner surface of the lower sheath.

4. The wastewater treatment device according to claim 1, characterized in that: At least two inner walls of the chamber are provided with a vertical guide rail, and the outer edge of the movable orifice plate is provided with a sliding groove that matches the vertical guide rail. The movable orifice plate is slidably connected to the vertical guide rail via the sliding groove.

5. The wastewater treatment device according to claim 4, characterized in that: There is a gap between the outer edge of the movable perforated plate and the inner wall of the chamber; A flexible plate is also installed at the outer edge of the movable perforated plate, and the outer surface of the flexible plate is in contact with the inner wall of the chamber; the sliding groove is disposed on the flexible plate.

6. The wastewater treatment device according to claim 1, characterized in that: At least one guide wheel is rotatably mounted on each side of the bottom of the movable perforated plate, and the outer surface of the guide wheel abuts against the inner wall of the corresponding side of the chamber.

7. The wastewater treatment device according to claim 1, characterized in that: The inlet is located below the movable orifice plate, and the outlet is located above the fixed orifice plate. A drain pipe is arranged in the chamber, and the water inlet is connected to the drain pipe. The drain pipe is located below the movable orifice plate and is positioned near the bottom of the chamber.

8. The wastewater treatment device according to claim 7, characterized in that: The drain pipe includes a main pipe and multiple branch pipes. The inlet is connected to the main pipe. The multiple branch pipes are respectively arranged at intervals on both sides of the main pipe, and the inner end of the branch pipe is connected to the main pipe. Multiple outlet holes are arranged at the top and bottom of the branch pipes respectively. And / or, the outer wall of the housing is also provided with a cleaning and drainage port that communicates with the chamber, and the cleaning and drainage port is located near the bottom of the chamber.

9. The wastewater treatment device according to claim 1, characterized in that: The top of the housing is rotatably mounted with a nut that is screwed to the screw rod. The driving unit includes a drive motor and a transmission component. The drive motor is mounted on the top of the housing and drives multiple nuts to rotate synchronously via the transmission component.

10. The wastewater treatment device according to claim 1, characterized in that: The top wall of the housing is a perforated plate, and the drive unit is mounted on the perforated plate; And / or, a ladder is provided on the side wall of the box, a guardrail is provided at the top outer edge of the box, and a notch is provided on one side of the guardrail facing the ladder.

11. The wastewater treatment device according to claim 1, characterized in that: The top of the housing is provided with a sleeve that matches the screw. Each sleeve is fitted over the outside of one of the screws. The bottom of the sleeve is installed on the top surface of the housing. Photoelectric sensors facing the inside of the sleeve are installed above and below the sleeve, respectively. The photoelectric sensors are electrically connected to the drive unit.

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