Ecological aquaculture sewage multi-stage biological purification device

Abstract

The invention relates to the technical field of purification devices, in particular to an ecological aquaculture sewage multi-stage biological purification device which comprises a foundation plate, a first-stage purification pond, a second-stage purification pond and a third-stage purification pond are fixedly arranged on the foundation plate, and multi-stage biological purification of sewage is achieved through the first-stage purification pond, the second-stage purification pond and the third-stage purification pond; the biological membrane bearing plates are respectively positioned in the first-stage purification tank, the second-stage purification tank and the third-stage purification tank and are used for forming biological membranes to realize biological purification of the sewage; when the biological membrane bearing plates are installed, the biological membrane bearing plates only need to be connected to the installation bearing blocks in a sleeving mode, then the hydraulic rod pieces are started, the multiple biological membrane bearing plates can be automatically fixed, manual fixing operation on the biological membrane bearing plates is not needed, the operation is very convenient and rapid, meanwhile, the biological membrane bearing plates can be driven to move into the corresponding purification ponds, and the working efficiency is improved. The mounting efficiency of the biological membrane bearing plate is improved to a great extent, and the working intensity of workers is relieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of purification devices, in particular to an ecological aquaculture wastewater multi-stage biological purification device. BACKGROUND

[0002] In the process of ecological aquaculture, water pollution will be caused, and the wastewater needs to be treated. The commonly used purification method is multi-stage biological purification. The core of the method is to simulate the natural water self-purification process, to realize efficient purification of wastewater by scientifically controlling microbial community and reaction conditions. The biological membrane carrier plate is the key to biological purification. The biological membrane carrier plate is an important carrier for microbial biofilm formation. It generally needs to be fixedly installed in the purification tank. In order to ensure the purification effect of each stage, multiple biological membrane carrier plates are installed in each purification tank. For the installation of the biological membrane carrier plate, the synchronous installation and removal of multiple biological membrane carrier plates cannot be realized, which makes the installation and removal process of the biological membrane carrier plate more cumbersome, thereby affecting the work efficiency of cleaning and maintaining the biological membrane carrier plate, and also making the work intensity of the workers larger, which often needs to spend more time and effort on the installation and removal of the biological membrane carrier plate. SUMMARY

[0003] The purpose of the present application is to provide an ecological aquaculture wastewater multi-stage biological purification device to solve the problem of being unable to synchronously install and remove multiple biological membrane carrier plates as described in the background art.

[0004] To achieve the above purpose, the present application provides the following technical scheme: The ecological aquaculture wastewater multi-stage biological purification device comprises a foundation plate, a first-stage purification tank, a second-stage purification tank and a third-stage purification tank fixedly arranged on the foundation plate, and realizes multi-stage biological purification of wastewater through the first-stage purification tank, the second-stage purification tank and the third-stage purification tank; A biological membrane carrier plate is arranged in the first-stage purification tank, the second-stage purification tank and the third-stage purification tank respectively, and is used to form a biological membrane to realize biological purification of wastewater; A moving support assembly is used to support the biological membrane carrier plate and stably install it in the first-stage purification tank, the second-stage purification tank and the third-stage purification tank; A carrier plate position adjusting assembly is installed on the moving support assembly and is used to adjust the position of the biological membrane carrier plate to ensure accurate positioning; A carrier plate fixing assembly is also installed on the moving support assembly and is moved by the carrier plate position adjusting assembly to fixedly support the biological membrane carrier plate.

[0005] Further, an installation matching block is fixedly arranged at the upper end of the biological membrane carrier plate, and an installation matching hole is formed in the installation matching block.

[0006] Furthermore, the movable support assembly includes: a hydraulic rod, which is fixedly installed on the ground plate, and a cooperating movable strip is fixedly installed on the hydraulic rod; Support strips, of which there are three, are respectively installed in the primary purification tank, the secondary purification tank and the tertiary purification tank; A driving strip is located above a supporting strip, and a connecting spring is provided between the driving strip and the supporting strip; The movable support block is movably mounted on the support strip and is movably connected to the drive strip.

[0007] Furthermore, the movable strip is movably connected to the support plate strip, and the movable strip drives the support plate strip to move up and down.

[0008] Furthermore, an installation block is fixedly provided on the movable support block, and the installation block cooperates with the installation mating hole on the installation mating block to position and support the biofilm support plate.

[0009] Furthermore, the plate adjustment assembly is an adjustment plate, which is movably mounted on a movable support block and moved by the movable support block.

[0010] Furthermore, when the adjusting plate moves downward relative to the movable support block, the adjusting plate adjusts the position of the biofilm support plate and fixes the biofilm support plate.

[0011] Furthermore, the bearing plate fixing assembly includes: a counterweight bar, which is movably mounted on the support plate bar; A connecting block is also movably mounted on the support strip and movably connected to the counterweight strip. Support strips are installed on movable support blocks and are movably connected to connecting support blocks.

[0012] Furthermore, when the connecting block moves, it drives the supporting strip to move as well.

[0013] Furthermore, a stabilizing insert is fixedly provided on the supporting strip, and the biofilm support plate is fixed by the cooperation of the stabilizing insert with the biofilm support plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the present invention has a reasonable structural design and strong functionality, and has the following advantages: 1. When installing biofilm support plates, simply attach them to the mounting block and then activate the hydraulic rods to automatically fix multiple biofilm support plates without the need for manual fixing. This is very convenient and quick. At the same time, it can also move the biofilm support plates into the corresponding purification tank, which greatly improves the installation efficiency of biofilm support plates and reduces the workload of staff.

[0015] 2. During the fixing process of the biofilm support plate, the movement of the support strips will also drive the adjustment plate to move. Under the action of the adjustment plate, when the position of the biofilm support plate is offset, the position of the biofilm support plate can be adjusted to ensure accurate positioning and to initially fix the biofilm support plate.

[0016] 3. In addition, as the adjusting plate moves, it will drive the counterweight strip to move. Under the action of the counterweight strip, the supporting plate strip will move, so that the supporting plate strip and the biofilm plate can cooperate to further support and lock the biofilm plate, ensuring its stability during operation. Attached Figure Description

[0017] Figure 1 A first-view schematic diagram of the assembly of the ground substrate.

[0018] Figure 2 A second-view schematic diagram of the assembly of the ground substrate.

[0019] Figure 3 A first-person view diagram of the supporting slat assembly.

[0020] Figure 4 A second-view schematic diagram of the supporting slat assembly.

[0021] Figure 5 A third-view diagram of the supporting slat assembly.

[0022] Figure 6 This is an assembly diagram of the support strips, drive strips, movable bearing blocks, adjusting bearing plates, counterweight strips, and support strips.

[0023] Figure 7 This is a structural diagram of the supporting slats.

[0024] Figure 8 A first-view schematic diagram of the cooperation between the biofilm support plate and the movable support block.

[0025] Figure 9 A second-view schematic diagram showing the cooperation between the biofilm support plate and the movable support block.

[0026] Figure 10 A schematic diagram of the structure for adjusting the bearing plate.

[0027] Figure 11 This is a schematic diagram of the assembly of the counterweight strip and the support strip.

[0028] In the diagram: 1. Ground substrate; 11. Primary purification tank; 12. Secondary purification tank; 13. Tertiary purification tank; 14. Assembly support plate; 15. Support guide plate; 16. Support guide channel; 17. Matching support upright; 18. Limiting top strip; 2. Hydraulic rod; 21. Matching moving strip; 22. First connecting strip; 3. Support plate; 31. First moving guide hole; 32. External connecting support plate; 33. Connecting vertical plate; 34. Mounting support plate; 35. Matching support hole; 36. Connecting support frame; 37. Matching channel; 371. Displacement channel; 38. Support plate; 381. Limiting guide hole; 39. Support bottom block; 391. Limiting support rod; 4. Biofilm support plate; 41. Support stabilizing groove; 42. Mounting matching block; 43. Mounting matching hole; 44. 1. Inclined adjustment platform; 45. Rectangular mating column; 5. Drive strip; 51. Second moving guide hole; 52. Connecting spring; 53. Second connecting bar; 6. Movable support block; 60. Mounting support rod; 61. Mounting support block; 62. Mating insertion hole; 63. Mating connecting plate; 64. Support rod; 7. Adjustment support plate; 71. Mating insertion rod; 72. Adjustment push plate; 73. Mating support frame; 74. Connecting column; 8. Counterweight bar; 81. Mating inclined surface; 82. Insertion connecting rod; 83. Connecting top plate; 84. Third connecting bar; 85. Connecting support block; 86. Support through hole; 87. Support channel; 9. Support strip; 91. Stabilizing insert; 92. Top connecting plate; 93. Rectangular mating channel; 94. Support insertion hole; 95. Movable support plate. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] This invention provides a technical solution: like Figure 1 and Figure 2As shown, the ecological multi-stage biological purification device for aquaculture wastewater includes: a ground substrate 1, a biofilm support plate 4, a movable support assembly, a support plate adjustment assembly, and a support plate fixing assembly. A primary purification tank 11, a secondary purification tank 12, and a tertiary purification tank 13 are constructed on the ground substrate 1. Multi-stage biological purification of wastewater is achieved through these three tanks. Wastewater is transferred between the primary, secondary, and tertiary tanks via a water pump. The biofilm support plate 4 is located in each of the primary, secondary, and tertiary tanks to form a biofilm, thus achieving biological purification of the wastewater. This is the primary purification tank. 11. The biofilms formed on the biofilm support plates 4 in the secondary purification tank 12 and the tertiary purification tank 13 are of different types, thus achieving multi-stage biological purification. The movable support component is used to support the biofilm support plate 4 and drive the biofilm support plate 4 to move, so that it is stably installed in the primary purification tank 11, the secondary purification tank 12 and the tertiary purification tank 13. The support plate adjustment component is installed on the movable support component and is used to adjust the position of the biofilm support plate 4 to ensure its accurate positioning and easy fixation. The support plate fixing component is also installed on the movable support component and is driven to move by the support plate adjustment component to fix and support the biofilm support plate 4, ensuring its stability during operation.

[0031] like Figure 8 and Figure 9 As shown, an installation mating block 42 is integrally formed and fixedly installed on the upper end of the biofilm support plate 4. The installation mating block 42 has an installation mating hole 43. An inclined adjustment platform 44 is also integrally formed and symmetrically fixedly installed on the installation mating block 42. The surface of the inclined adjustment platform 44 is smooth and burr-free. In addition, a rectangular mating column 45 is symmetrically welded and fixed on the installation mating block 42 by welding process. The surface of the rectangular mating column 45 is smooth and burr-free. Support stabilizing grooves 41 are symmetrically opened on both sides of the biofilm support plate 4.

[0032] like Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, an assembly support plate 14 is built on the base plate 1. Supporting guide plates 15 are welded and fixed to the primary purification tank 11, the secondary purification tank 12 and the tertiary purification tank 13 respectively by welding process. Supporting guide channels 16 are opened on the supporting guide plates 15. The inner wall of the supporting guide channels 16 is smooth and burr-free. The upper ends of the primary purification tank 11, the secondary purification tank 12 and the tertiary purification tank 13 are respectively welded and fixed to the upper ends by welding process. Limiting top strips 18 are welded and fixed to the upper ends of the supporting top strips 17 by welding process.

[0033] The movable support assembly includes: a hydraulic rod 2, a support strip 3, a drive strip 5, and a movable support block 6. The hydraulic rod 2 is fixedly mounted on the mounting plate 14 on the base plate 1 by screws, and a mating movable strip 21 is fixedly mounted on the hydraulic rod 2 by screws. The mating movable strip 21 is inserted into the support guide channel 16 on the support guide plate 15 and contacts the inner wall of the support guide channel 16. The support guide plate 15 is supported by the cooperation between the support guide channel 16 and the support guide plate 15.

[0034] There are three support strips 3, which are respectively installed in the primary purification tank 11, the secondary purification tank 12 and the tertiary purification tank 13. Specifically, a first movable guide hole 31 is opened on the support strip 3, and a matching support rod 17 is inserted into the first movable guide hole 31. The movable installation of the support strip 3 is realized through the cooperation between the first movable guide hole 31 and the matching support rod 17, and the matching support rod 17 guides and limits the support strip 3.

[0035] An outer connecting plate 32 is integrally formed and fixed on the support strip 3. The lower end of the outer connecting plate 32 is welded and fixed to the connecting vertical plate 33. A first connecting rod 22 is hinged to the moving strip 21. The upper end of the first connecting rod 22 is hinged to the connecting vertical plate 33. The first connecting rod 22 realizes the movable connection between the moving strip 21 and the support strip 3, and thus the support strip 3 can be moved up and down by the moving strip 21.

[0036] A second movable guide hole 51 is provided on the drive plate 5, and a matching support rod 17 is inserted into the second movable guide hole 51. The drive plate 5 is guided and limited by the cooperation between the second movable guide hole 51 and the matching support rod 17, so that the drive plate 5 can only move up and down along the matching support rod 17. The drive plate 5 is located on the upper side of the support plate 3, and a connecting spring 52 is provided between the drive plate 5 and the support plate 3. In addition, the connecting spring 52 is sleeved on the matching support rod 17, and the upper end of the connecting spring 52 is welded to the drive plate 5, and the lower end of the connecting spring 52 is welded to the support plate 3.

[0037] A mounting plate 34 is welded to the support strip 3. A mating hole 35 is provided on the mounting plate 34. A mounting rod 60 is welded to the movable support block 6. The mounting rod 60 is inserted into the mating hole 35. The movable support block 6 is supported by the mating of the mounting rod 60 and the mating hole 35. The movable support block 6 is movably mounted on the support strip 3. A mating connecting plate 63 is also welded to the movable support block 6. A second connecting rod 53 is hinged to the mating connecting plate 63. The upper end of the second connecting rod 53 is hinged to the drive strip 5. The movable connection between the movable support block 6 and the drive strip 5 is realized through the second connecting rod 53.

[0038] The movable support block 6 is fixedly welded with an installation support block 61 by welding process. The surface of the installation support block 61 is smooth and burr-free. The installation support block 61 cooperates with the installation mating hole 43 on the installation mating block 42 to position and support the biofilm support plate 4. That is, at this time, the installation support block 61 is inserted into the installation mating hole 43, and the installation mating block 42 is in contact with the movable support block 6.

[0039] In addition, the upper end of the movable support block 6 is provided with a mating insertion hole 62, and the two sides of the movable support block 6 are symmetrically welded and fixed with support rods 64 by welding process.

[0040] The mounting plate 34 is symmetrically welded to both sides by a welding process to form a connecting bracket 36. A mating channel 37 is provided on the connecting bracket 36, and a displacement channel 371 is connected to the mating channel 37. The inner walls of the mating channel 37 and the displacement channel 371 are smooth and burr-free, and their internal dimensions are the same. The upper surface of the mounting plate 34 is symmetrically welded to both sides to form a support plate 38. A limit guide hole 381 is provided on the support plate 38. In addition, the lower end face of the mounting plate 34 is welded to a support base block 39. Limit support rods 391 are symmetrically welded to both sides of the support base block 39 by a welding process.

[0041] like Figure 3 , Figure 5 , Figure 7 and Figure 10 As shown, the plate adjustment assembly is an adjustment plate 7. A mating plug rod 71 is welded and fixed to the lower end surface of the adjustment plate 7 by welding. The mating plug rod 71 is inserted into the mating plug hole 62. The mating plug rod 71 and the mating plug hole 62 limit the adjustment plate 7, and the adjustment plate 7 is movably installed on the movable support block 6 by the cooperation of the two. The movable support block 6 drives it to move.

[0042] Adjustment push plates 72 are symmetrically and integrally formed and fixed on the adjustment support plate 7. The surface of the adjustment push plate 72 is smooth and burr-free. On the lower end face of the adjustment support plate 7, a matching support frame 73 is symmetrically welded and fixed by welding process. A connecting column 74 is welded and fixed on the end of the matching support frame 73 away from the adjustment support plate 7 by welding process. The surface of the connecting column 74 is smooth and burr-free. When the biofilm support plate 4 is fixedly installed on the movable support block 6, the connecting column 74 is inserted into the matching channel 37 and contacts the inner wall of the matching channel 37.

[0043] When the adjusting plate 7 moves downward relative to the movable support block 6, if the biofilm support plate 4 is not accurately positioned, the adjusting push plate 72 on the adjusting plate 7 will contact the inclined surface on the inclined adjusting platform 44 to adjust the position of the biofilm support plate 4 so that it is accurately positioned, and the adjusting push plate 72 contacts the inclined adjusting platform 44 to fix the biofilm support plate 4.

[0044] like Figure 3 , Figure 5 , Figure 6 and Figure 11 As shown, the bearing plate fixing assembly includes: a counterweight bar 8, a connecting block 85, and a supporting plate 9. The lower end face of the counterweight bar 8 is integrally formed with a mating bevel 81, and the surface of the counterweight bar 8 is smooth and burr-free. The upper end of the counterweight bar 8 is welded and fixed with a connecting rod 82. The connecting rod 82 is inserted into the limiting guide hole 381. The counterweight bar 8 is movably installed on the supporting plate 3 through the cooperation between the connecting rod 82 and the limiting guide hole 381. A connecting top plate 83 is welded and fixed to the upper end of the connecting rod 82. In addition, when the connecting column 74 is in the mating channel 37, it is in contact with the lower end face of the counterweight bar 8.

[0045] The connecting block 85 has a support through hole 86, and a limiting support rod 391 is inserted into the support through hole 86. The connecting block 85 is also movably installed on the support strip 3 through the cooperation of the support through hole 86 and the limiting support rod 391, and the connecting block 85 is limited and supported by the cooperation of the support through hole 86 and the limiting support rod 391, so that the connecting block 85 can only move along the limiting support rod 391. In addition, a third connecting rod 84 is hinged on the connecting top plate 83. The lower end of the third connecting rod 84 is hinged to the connecting block 85, and the movable connection between the connecting block 85 and the counterweight strip 8 is realized through the third connecting rod 84.

[0046] An upper connecting plate 92 is integrally formed and fixedly installed on the upper end of the supporting strip 9. A support insertion hole 94 is opened on the upper connecting plate 92, and a supporting rod 64 is inserted into the support insertion hole 94. The supporting strip 9 is movably installed on the movable support block 6 through the cooperation of the support insertion hole 94 and the supporting rod 64, and the support insertion hole 94 and the supporting rod 64 support and guide the supporting strip 9, so that the supporting strip 9 can move along the supporting rod 64. In addition, a movable support plate 95 is welded and fixed on the upper connecting plate 92 through a welding process, and on the connecting support block 85 A support channel 87 is also provided, in which a movable support plate 95 is inserted and contacts the inner wall of the support channel 87. The cooperation between the movable support plate 95 and the support channel 87 can further support the support strip 9. The cooperation between the movable support plate 95 and the support channel 87 also enables the movable connection between the support strip 9 and the connecting block 85. When the connecting block 85 moves, it can drive the support strip 9 to move. In addition, the movable support plate 95 can move along the support channel 87.

[0047] A stabilizing insert 91 is integrally formed and fixed on the supporting strip 9. The stabilizing insert 91 is inserted into the support stabilizing groove 41 on the biofilm support plate 4 and contacts the inner wall of the support stabilizing groove 41. The biofilm support plate 4 is fixed by its cooperation with the support stabilizing groove 41. In addition, a rectangular mating channel 93 is also opened on the top connecting plate 92. When the stabilizing insert 91 is inserted into the support stabilizing groove 41, the rectangular mating column 45 is also inserted into the rectangular mating channel 93, which can further support and fix the biofilm support plate 4.

[0048] When the biofilm support plate 4 needs to be disassembled, cleaned, or maintained, the hydraulic rod 2 is activated to drive the mating moving strip 21 to move away from the assembly support plate 14. As the mating moving strip 21 moves, it will push the support strip 3 upward under the action of the first connecting strip 22. As the support strip 3 moves upward, it will drive the biofilm support plate 4 in the primary purification tank 11, the secondary purification tank 12, and the tertiary purification tank 13 to move out of the primary purification tank 11, the secondary purification tank 12, and the tertiary purification tank 13, respectively. When the driving strip 5 contacts the limiting top strip 18, the biofilm support plate 4 is completely removed from the purification tank.

[0049] After the biofilm support plate 4 in the primary purification tank 11, secondary purification tank 12, and tertiary purification tank 13 is removed from the primary purification tank 11, secondary purification tank 12, and tertiary purification tank 13 respectively, as the support strip 3 moves further upward, the drive strip 5 will no longer move under the restriction of the limiting top strip 18. As the support strip 3 moves upward, the distance between the drive strip 5 and the support strip 3 will decrease, causing the connecting spring 52 to be in a compressed state. Thus, under the action of the second connecting bar 53, the movable support block 6 will move away from the drive strip 5, thereby moving the biofilm support plate 4 to the side of the purification tank for easy removal by the staff.

[0050] As the movable support block 6 moves away from the driving strip 5, it also drives the adjusting support plate 7 to move, which in turn causes the connecting column 74 on the adjusting support plate 7 to move in the mating channel 37 until the connecting column 74 moves to the position of the mating slope 81. At this time, as the connecting column 74 moves, the counterweight 8 loses its support, and then moves downward under its own weight. As the counterweight 8 moves downward, it pushes the connecting support block 85 away from the mounting support plate 34 under the action of the third connecting bar 84, which in turn drives the support plate 9 to move away from the biofilm support plate 4. This allows the stabilizing insert 91 on the support plate 9 to exit the support stabilizing groove 41, and at the same time, it causes the rectangular mating column 45 on the biofilm support plate 4 to exit the rectangular mating channel 93.

[0051] In addition, as the movable support block 6 continues to move, the connecting column 74 will move into the displacement channel 371. With the cooperation of the displacement channel 371 and the connecting column 74, the adjusting support plate 7 will move upward, and the adjusting push plate 72 will move upward, no longer contacting the inclined adjusting platform 44. This allows the biofilm support plate 4 to be unlocked, and multiple biofilm support plates 4 can be unlocked simultaneously without having to unlock them one by one.

[0052] During the installation of the biofilm support plate 4, the mounting mating block 42 is fitted onto the mounting support block 61 through the mounting mating hole 43 to position the biofilm support plate 4. After the biofilm support plates 4 at the primary purification tank 11, secondary purification tank 12, and tertiary purification tank 13 are all positioned, the hydraulic rod 2 can be activated to move the mating moving strip 21 towards the assembly support plate 14. As the mating moving strip 21 moves, it will drive the support plate 3 to move downward. At this time, under the action of the connecting spring 52, the driving plate 5 is kept in close contact with the limiting top strip 18 and does not move. This increases the distance between the support strip 3 and the drive strip 5, causing the movable support block 6 to move towards the drive strip 5. During this movement, the adjustment support plate 7 moves downward under the action of the displacement channel 371. If the positioning of the biofilm support plate 4 is off, the adjustment push plate 72 will contact the inclined surface on the inclined adjustment platform 44, thereby pushing the inclined adjustment platform 44 to move, so that the installation mating block 42 contacts the movable support block 6, making the biofilm support plate 4 accurately positioned. Finally, it can be initially fixed by the adjustment support plate 7.

[0053] As the movable support block 6 moves toward the drive strip 5, when the connecting column 74 moves to the position of the mating inclined surface 81, the mating of the connecting column 74 and the mating inclined surface 81 will push the counterweight strip 8 upward. Under the action of the third connecting bar 84, the connecting support block 85 will move toward the mounting plate 34, which in turn will move the support strip 9 toward the biofilm plate 4. The support strip 9 can then further fix the biofilm plate 4. As the support strip 3 moves downward, it can drive the drive strip 5 to move downward synchronously, which will also move the biofilm plate 4 into the purification tank. This allows for the synchronous fixing and installation of multiple biofilm plates 4, which is very convenient.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An ecological multi-stage biological purification device for aquaculture wastewater, characterized in that: include: A ground substrate, on which a primary purification tank, a secondary purification tank, and a tertiary purification tank are fixedly installed, thereby achieving multi-stage biological purification of wastewater through the primary, secondary, and tertiary purification tanks; Biofilm support plates are placed in primary, secondary and tertiary purification tanks respectively, and are used to form biofilm to achieve biological purification of wastewater; A mobile support assembly is used to support the biofilm support plate so that it can be stably installed in the primary purification tank, the secondary purification tank and the tertiary purification tank. A substrate positioning assembly is installed on a movable support assembly and is used to adjust the position of the biofilm substrate to ensure accurate positioning. The substrate fixing assembly is also installed on the movable support assembly. It is moved by the substrate adjusting assembly to fix and support the biofilm substrate.

2. The ecological multi-stage biological purification device for aquaculture wastewater according to claim 1, characterized in that: An installation mating block is fixedly provided at the upper end of the biofilm support plate, and an installation mating hole is provided on the installation mating block.

3. The ecological multi-stage biological purification device for aquaculture wastewater according to claim 2, characterized in that: The movable support assembly includes: a hydraulic rod, which is fixedly installed on the ground plate, and a matching movable strip is fixedly installed on the hydraulic rod; Support strips, of which there are three, are respectively installed in the primary purification tank, the secondary purification tank and the tertiary purification tank; A driving strip is located above a supporting strip, and a connecting spring is provided between the driving strip and the supporting strip; The movable support block is movably mounted on the support strip and is movably connected to the drive strip.

4. The ecological multi-stage biological purification device for aquaculture wastewater according to claim 3, characterized in that: The movable strip is movably connected to the support plate strip, and the movable strip drives the support plate strip to move up and down.

5. The ecological multi-stage biological purification device for aquaculture wastewater according to claim 4, characterized in that: An installation block is fixedly installed on the movable support block, and the installation block cooperates with the installation mating hole on the installation mating block to position and support the biofilm support plate.

6. The ecological multi-stage biological purification device for aquaculture wastewater according to claim 5, characterized in that: The plate adjustment assembly is an adjustment plate, which is movably mounted on a movable support block and moved by the movable support block.

7. The ecological multi-stage biological purification device for aquaculture wastewater according to claim 6, characterized in that: When the adjusting plate moves downward relative to the movable support block, the adjusting plate adjusts the position of the biofilm support plate and fixes the biofilm support plate.

8. The ecological multi-stage biological purification device for aquaculture wastewater according to claim 7, characterized in that: The bearing plate fixing assembly includes: a counterweight bar, which is movably mounted on the support plate bar; A connecting block is also movably mounted on the support strip and movably connected to the counterweight strip. Support strips are installed on movable support blocks and are movably connected to connecting support blocks.

9. The ecological multi-stage biological purification device for aquaculture wastewater according to claim 8, characterized in that: When the connecting block moves, it drives the supporting strip to move.

10. The ecological multi-stage biological purification device for aquaculture wastewater according to claim 9, characterized in that: A stabilizing insert is fixedly installed on the support plate strip, and the biofilm support plate is fixed by the cooperation of the stabilizing insert and the biofilm support plate.

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