Sedimentation tank used in multi-stage filtration sewage treatment process

Abstract

The invention relates to the technical field of sewage treatment, and discloses a settling tank in a multistage filtration sewage treatment process, the settling tank comprises a base and a treatment cylinder, the treatment cylinder is internally provided with a sewage treatment structure and a sludge aggregation structure; the sewage treatment structure comprises an inner cylinder, a bottom cylinder, a filter plate, a drainage pipe, a sludge discharge pipe I, a sludge discharge pipe II and a water inlet pipe which are arranged in the center of the interior of the treatment cylinder; wherein the inner cylinder is fixedly connected with the bottom cylinder, the middle cylinder is located between the inner cylinder and the processing cylinder, and a sealing plate is arranged between the inner cylinder and the inner wall of the middle cylinder in a sealing and sleeving mode. According to the invention, injected sewage is enabled to vortex in the bottom cylinder, so that most of silt can be deposited in the bottom cylinder, water subjected to primary treatment enters the treatment cylinder to be deposited again, and after the water is blocked by the filter plate, clean treated water can overflow from the edge ring and is discharged; according to the step design, large-scale low-cost sewage treatment can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, in particular to a sedimentation tank in a multi-stage filtration sewage treatment process. Background Art

[0002] Sedimentation equipment refers to equipment that uses gravity to precipitate solid particles or droplets suspended in liquid. It is mainly used in solid-liquid separation and extraction processes to filter, dehydrate and fix particles.

[0003] An existing patent discloses a multi-stage filtration sewage treatment device (CN118359244A), which includes a support frame, a sedimentation tank fixedly connected to the support frame, a sewage inlet pipe connected to one side of the sedimentation tank, a sewage discharge pipe connected to the bottom of the sedimentation tank, a fixed shell fixed to the sedimentation tank, a filter element fixed to the sedimentation tank, an overflow port connected to the fixed shell, and a linear array of inclined plates fixed to the sedimentation tank. The lower side of the inclined plates is provided with an inverted V-shaped surface distributed in a linear array. The technology disclosed in this patent has low sewage treatment efficiency and is not suitable for large-scale sewage treatment. In addition, sludge is prone to sedimentation to one side of the tank. Summary of the Invention

[0004] The main technical problem solved by the present invention is to provide a sedimentation tank in a multi-stage filtration sewage treatment process, which solves the problems in the above-mentioned background technology.

[0005] To solve the above technical problems, according to one aspect of the present invention, more specifically, a sedimentation tank in a multi-stage filtration sewage treatment process comprises a base and a treatment barrel, wherein a sewage treatment structure and a sludge accumulation structure are provided inside the treatment barrel;

[0006] The sewage treatment structure includes an intermediate cylinder, an inner cylinder, a bottom cylinder, a filter plate, a drainage pipe, a first mud discharge pipe, a second mud discharge pipe and a water inlet pipe arranged at the center of the treatment cylinder;

[0007] The inner cylinder is fixedly connected to the bottom cylinder, the intermediate cylinder is located between the inner cylinder and the treatment cylinder, and a sealing plate is provided between the inner cylinder and the inner wall of the intermediate cylinder. A water outlet hole is provided on the upper surface of the inner cylinder, wherein the water outlet hole is located below the sealing plate, and the filter plate is located between the intermediate cylinder and the treatment cylinder;

[0008] The sludge gathering structure comprises an outer slide rail, an inner slide rail, a pulley, a connecting plate and a scraper at the bottom of the treatment cylinder, and both ends of the outer slide rail and the inner slide rail are fixedly connected to a stand.

[0009] Furthermore, an edge ring is provided on the inner surface of the treatment cylinder and above the filter plate, wherein one end of the drain pipe passes through the inner side of the edge ring, and the edge ring is used to collect water overflowing from the filtration. An overflow pipe is provided above the treatment cylinder, and the other end of the overflow pipe passes through the top of the intermediate cylinder.

[0010] Furthermore, the bottom tube is thin at the upper and lower ends and thick in the middle. The other end of the water inlet pipe passes through the waist of the bottom tube and is connected to the water outlet pipe. The two ends of the water outlet pipe have opposite water outlet directions.

[0011] One end of the mud discharge pipe 1 passes through the bottom of the bottom cylinder, and one end of the mud discharge pipe 2 passes through the bottom of the treatment cylinder. A support rod is provided below the filter plate, and the support rod is fixedly connected to the base.

[0012] Furthermore, the stand is fixedly connected to the base, and the connecting plate is located between the outer slide rail and the inner slide rail.

[0013] Furthermore, there are four pulleys, which are respectively located at the four ends of the connecting plate. The bottom end of the connecting plate is fixedly connected to the scraper, wherein connecting rods are provided on both sides of the scraper, and the other end of the connecting rod is connected to the lower surface of the connecting plate.

[0014] Furthermore, a driving box is provided between the bottom end of the inner cylinder and the middle cylinder, an inner rotating cylinder and an outer rotating cylinder are provided below the driving box, a first soft rope is wound around the surface of the inner rotating cylinder, and a second soft rope is wound around the surface of the outer rotating cylinder;

[0015] A smooth hole is provided on the top of the two upright frames. The other end of the soft rope one passes through the smooth hole on the inner upright frame and is connected to one end of the connecting plate. The other end of the soft rope two passes through the smooth hole on the outer upright frame and is connected to the other end of the connecting plate.

[0016] Furthermore, the drive box includes a sealed cavity at the top, a connecting shaft is provided through the bottom end of the sealed cavity, and the upper and lower ends of the connecting shaft are respectively provided with a right-angle gear and an outer bevel gear three, the surface of the inner rotating cylinder is coaxially connected with the outer bevel gear two, and the surface of the outer rotating cylinder is coaxially connected with the outer bevel gear one, and the outer bevel gear three is respectively meshed with the outer bevel gear one and the outer bevel gear two.

[0017] Furthermore, a fixed rotating rod is provided through the interior of the sealed cavity, water wheels are sleeved on both ends of the fixed rotating rod, a gear column is sleeved on the middle surface of the fixed rotating rod, and the water wheel is used to receive the power of the water overflowing from the water outlet;

[0018] Vertical plates are fixedly connected to the inside of the sealed cavity and on the left and right sides of the right-angle gear. A movable rotating rod that can move left and right is provided above the vertical plates. Two limiting rings are sleeved on the surface of the movable rotating rod and located between the two vertical plates. A right bevel gear, a movable gear and a left bevel gear are sleeved on the surface of the movable rotating rod and located between the two limiting rings, wherein the movable gear can always be engaged with the gear column.

[0019] Furthermore, the left end of the movable rotating rod is provided with two limit rings 2, and the left end of the movable rotating rod and the surface movable sleeve located on the two limit rings 2 are provided with a push plate. An electric push rod is also provided inside the sealed cavity, and the output shaft of the electric push rod is fixedly connected to the other end of the push plate. The electric push rod is used to drive the movable rotating rod to move left or right.

[0020] Furthermore, a lower rotating rod is provided between the two vertical plates and below the movable rotating rod, two limiting rings three are sleeved on the surface of the lower rotating rod and located between the two vertical plates, a left transmission gear, a lower bevel gear and a right transmission gear are sleeved on the surface of the lower rotating rod and located between the two limiting rings three, wherein the right transmission gear is meshed with the right-angle gear, and an angle sensor is provided on the right side of the interior of the sealed cavity, wherein the right end of the lower rotating rod passes through the angle sensor.

[0021] Beneficial effects:

[0022] 1. The present invention allows the injected sewage to swirl in the bottom cylinder, so that most of the sediment can be deposited inside the bottom cylinder, and the preliminarily treated water enters the treatment cylinder for further deposition. After being blocked by the filter plate, the clean treated water can overflow from the edge ring and be discharged. The above-mentioned step design can achieve large-scale and low-cost sewage treatment.

[0023] 2. The present invention can scrape away all the sludge accumulated inside the treatment cylinder and gather it below the second sludge discharge pipe through the sludge gathering structure, so as to avoid the phenomenon that the sludge on the left side is difficult to be processed and accumulates when only the second sludge discharge pipe is used for sludge treatment.

[0024] 3. The present invention uses a water wheel to drive the inner and outer drums to rotate, and then drives the scraper to move left and right inside the treatment drum through a soft rope. This design can reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 It is a front cross-sectional view of the present invention;

[0027] Figure 3This is a schematic structural diagram of the inner cylinder, the middle cylinder and the filter plate of the present invention;

[0028] Figure 4 It is a structural schematic diagram of the connecting plate of the present invention;

[0029] Figure 5 This is a schematic structural diagram of the drive box of the present invention from the right perspective;

[0030] Figure 6 For the present invention Figure 5 Enlarged view of area A in the middle;

[0031] Figure 7 This is a schematic structural diagram of the drive box of the present invention from the front perspective;

[0032] Figure 8 A top view of the present invention;

[0033] Figure 9 For the present invention Figure 8 Cross-sectional view of area B;

[0034] Figure 10 It is a top sectional view of the bottom tube in the present invention.

[0035] In the figure: 1. Base; 2. Treatment cylinder; 3. Overflow pipe; 4. Drain pipe; 5. Mud discharge pipe 1; 6. Mud discharge pipe 2; 7. Filter plate; 8. Edge ring; 9. Intermediate cylinder; 10. Inner cylinder; 11. Water outlet; 12. Sealing plate; 13. Water inlet pipe; 14. Bottom cylinder; 15. Water outlet pipe; 16. Angle sensor; 17. Sealing chamber; 18. Support rod; 19. Drive box; 20. Smooth hole; 21. Inner rotating cylinder; 22. Outer rotating cylinder; 23. Soft rope 1; 24. Soft rope 2; 25. Stand; 26. Outer slide rail; 27. Inner slide rail; 28. Pulley; 29. Connector Plate; 30. Scraper; 31. Connecting rod; 32. Outer bevel gear 1; 33. Outer bevel gear 2; 34. Outer bevel gear 3; 35. Water wheel; 36. Fixed rotating rod; 37. Gear column; 38. Moving gear; 39. Vertical plate; 40. Moving rotating rod; 41. Right bevel gear 1; 42. Left bevel gear 1; 43. Limiting ring 1; 44. Limiting ring 2; 45. Electric push rod; 46. Lower rotating rod; 47. Left transmission gear; 48. Right-angle gear; 49. Connecting shaft; 50. Lower bevel gear; 51. Right transmission gear; 52. Limiting ring 3; 53. Push plate. DETAILED DESCRIPTION

[0036] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] like Figure 1-3As shown, according to one aspect of the present invention, a sedimentation tank for a multi-stage filtration sewage treatment process is provided, comprising a base 1 and a treatment barrel 2, wherein a sewage treatment structure and a sludge aggregation structure are provided inside the treatment barrel 2; the sewage treatment structure comprises an intermediate barrel 9, an inner barrel 10, a bottom barrel 14, a filter plate 7, a drain pipe 4, a sludge discharge pipe 1 5, a sludge discharge pipe 2 6 and a water inlet pipe 13 arranged at the inner center of the treatment barrel 2; wherein the inner barrel 10 is fixedly connected to the bottom barrel 14, the intermediate barrel 9 is located between the inner barrel 10 and the treatment barrel 2, and a sealing plate 12 is provided in a sealing sleeve between the inner barrel 10 and the inner wall of the intermediate barrel 9, a water outlet hole 11 begins to be provided on the upper surface of the inner barrel 10, wherein the water outlet hole 11 is located below the sealing plate 12, and the filter plate 7 is located between the intermediate barrel 9 and the treatment barrel 2. The inner surface of the treatment cylinder 2 is provided with an edge ring 8 above the filter plate 7, wherein the other end of the drain pipe 4 passes through the inner side of the edge ring 8, and the edge ring 8 is used to collect the overflow filtered water. The overflow pipe 3 is provided above the treatment cylinder 2, and the other end of the overflow pipe 3 passes through the top of the intermediate cylinder 9 (such as Figure 1 As shown), the overflow pipe 3 is used to overflow the water in the inner cylinder 10 that cannot flow out of the water outlet 11 in time, so as to prevent the overflowing water from entering the edge ring 8 and causing drainage pollution.

[0039] In this embodiment, the bottom tube 14 is thin at the upper and lower ends and thick in the middle. The other end of the water inlet pipe 13 passes through the waist of the bottom tube 14 and is connected to the water outlet pipe 15. The two ends of the water outlet pipe 15 have opposite water outlet directions. One end of the mud discharge pipe 15 passes through the bottom of the bottom tube 14, and one end of the mud discharge pipe 2 6 passes through the bottom of the treatment tube 2. A support rod 18 is provided below the filter plate 7, and the support rod 18 is fixedly connected to the base 1. This allows the injected sewage to swirl in the bottom tube 14 (such as Figure 10 As shown), most of the sediment is deposited inside the bottom cylinder 14, and the preliminarily treated water enters the treatment cylinder 14 to be deposited again. After being blocked by the filter plate 7, the clean treated water can overflow from the edge ring 8 and be discharged.

[0040] Example 2

[0041] like Figure 1-4As shown, the sludge collection structure includes an outer slide rail 26, an inner slide rail 27, pulleys 28, a connecting plate 29, and a scraper 30 at the bottom of the treatment drum 2. Both ends of the outer slide rail 26 and the inner slide rail 27 are fixedly connected to a stand 25, which is fixedly connected to the base 1. The connecting plate 29 is located between the outer slide rail 26 and the inner slide rail 27. There are four pulleys 28, each located at the four ends of the connecting plate 29. The bottom end of the connecting plate 29 is fixedly connected to the scraper 30. Connecting rods 31 are provided on both sides of the scraper 30, and the other ends of the connecting rods 31 are connected to the bottom surface of the connecting plate 29. The sludge collection structure can scrape away all the sludge accumulated inside the treatment drum 2 and collect it below the sludge discharge pipe 2 6. This can prevent the sludge on the left side from being difficult to process and accumulating when only the sludge discharge pipe 2 6 is used for sludge treatment.

[0042] Example 3

[0043] like Figure 1-10 As shown, a driving box 19 is provided between the bottom end of the inner cylinder 10 and the middle cylinder 9, and an inner rotating cylinder 21 and an outer rotating cylinder 22 are provided below the driving box 19. A soft rope 1 23 is wound around the surface of the inner rotating cylinder 21, and a soft rope 2 24 is wound around the surface of the outer rotating cylinder 22. Smooth holes 20 are provided on the tops of the two vertical frames 25. The other end of the soft rope 1 23 passes through the smooth hole 20 on the inner vertical frame 25 and is connected to one end of the connecting plate 29. The other end of the soft rope 24 passes through the smooth hole 20 on the outer vertical frame 25 and is connected to the other end of the connecting plate 29. The drive box 19 includes a sealed chamber 17 at the top, and a connecting shaft 49 is provided at the bottom end of the sealed chamber 17. The upper and lower ends of the connecting shaft 49 are respectively provided with a right-angle gear 48 and an outer bevel gear 3 34. The surface of the inner rotating cylinder 21 is coaxially connected to the outer bevel gear 2 33, and the surface of the outer rotating cylinder 22 is coaxially connected to the outer bevel gear 1 32. The outer bevel gear 3 34 is meshed with the outer bevel gear 1 32 and the outer bevel gear 2 33 (as shown in FIG. Figure 5 As shown in the figure, the inner drum 21 and the outer drum 22 always rotate in reverse synchronously. That is, the outer drum 22 releases the second cord 24, while the inner drum 21 contracts the first cord 23. When the outer drum 22 contracts the second cord 24, the inner drum 21 releases the first cord 23.

[0044] In this embodiment, a fixed rotating rod 36 is provided inside the sealed cavity 17, and water wheels 35 are provided at both ends of the fixed rotating rod 36. A gear column 37 is provided on the middle surface of the fixed rotating rod 36, and the water wheel 35 is used to receive the power of water overflowing from the water outlet 11; the interior of the sealed cavity 17 and the left and right sides of the right-angle gear 48 are fixedly connected with vertical plates 39, and a movable rotating rod 40 that can move left and right is provided above the vertical plates 39, and two limiting rings 43 are provided on the surface of the movable rotating rod 40 and between the two vertical plates 39, and a right bevel gear 41, a movable gear 38 and a left bevel gear 42 are provided on the surface of the movable rotating rod 40 and between the two limiting rings 43, wherein the movable gear 38 can always be engaged with the gear column 37.

[0045] In this embodiment, the left end of the movable rotating rod 40 is provided with two limiting rings 2 44, and the left end of the movable rotating rod 40 and the surface movable sleeve located on the two limiting rings 2 44 is provided with a push plate 53. The inside of the sealed cavity 17 is also provided with an electric push rod 45, and the output shaft of the electric push rod 45 is fixedly connected to the other end of the push plate 53. The electric push rod 45 is used to drive the movable rotating rod 40 to move left or right.

[0046] In this embodiment, a lower rotating rod 46 is provided between the two vertical plates 39 and below the movable rotating rod 40. Two limiting rings 352 are sleeved on the surface of the lower rotating rod 46 and located between the two vertical plates 39. A left transmission gear 47, a lower bevel gear 50 and a right transmission gear 51 are sleeved on the surface of the lower rotating rod 46 and located between the two limiting rings 352. The right transmission gear 51 is meshed and connected with the right-angle gear 48. An angle sensor 16 is provided on the right side of the interior of the sealed cavity 17. The right end of the lower rotating rod 46 passes through the angle sensor 16. The angle sensor 16 is used to detect the moving state of the connecting plate 29.

[0047] The working principle of the present invention is: sewage is injected into the interior of the bottom tube 14 from the water inlet pipe 13 and discharged from both ends of the water outlet pipe 15 (such as Figure 10 As shown in the figure, since the two ends of the outlet pipe 15 have opposite water discharge directions, the discharged water will form a vortex inside the bottom tube 14. And the bottom tube 14 adopts a design with a thick waist and thin ends, so that the sewage will accumulate during the rotation inside the bottom tube 14. When the accumulated sludge submerges one end of the sludge discharge pipe 5 (as shown in the figure), the sludge will accumulate inside the bottom tube 14. Figure 2 As shown), the sludge can be pumped out through the sludge discharge pipe 5.

[0048] When sewage is continuously injected into the bottom tube 14, the excess sewage will flow into the bottom of the sealing plate 12 through the outlet hole 11 (as shown in FIG. Figure 2As shown, the sewage flows along the intermediate tube 9 into the treatment tube 2. Sludge in the sewage flowing into the intermediate tube 9 accumulates again. When the accumulated sludge covers one end of the sludge discharge pipe 6, it can be pumped out through the sludge discharge pipe 6. The sewage then overflows upward through the filter plate 7. The inclined design of the filter plate 7 prevents the sludge from being trapped below the filter plate 7. The treated water then overflows from the edge of the edge ring 8 into the inner side of the edge ring 8 and is discharged through the drain pipe 4.

[0049] When sludge accumulates inside the treatment barrel 2, if it is only pumped away by the sludge discharge pipe 2 6, the sludge will eventually accumulate mainly on the left side of the treatment barrel 2. For this reason, a sludge gathering structure is required to collect all the sludge in the treatment barrel 2 under the sludge discharge pipe 2 6 for pumping. The connecting plate 29 and the pulley 28 will move along the slide rail (as shown in FIG. Figure 4 No matter whether the connection plate 29 drives the scraper 30 to move clockwise or counterclockwise, the silt on the base 1 will be scraped and deposited below the mud discharge pipe 2 6.

[0050] The movement of the connecting plate 29 is driven by the soft rope 1 23 and the soft rope 2 24 (eg Figure 3 When the water in the water outlet 11 flows out through the inside of the drive box 19, it will drive the two water wheels 35 to rotate (as shown). Figure 5 As shown), the rotation of the water wheel 35 drives the outer bevel gear 34 to rotate through the gear column 37, the moving gear 38, the right bevel gear 1 41, the lower bevel gear 50, the right transmission gear 51 and the right angle gear 48 (as shown). Figure 5 、 6 As shown in the figure), the outer bevel gear three 34 will drive the outer bevel gear one 32 and the outer bevel gear two 33 to rotate synchronously in the opposite direction, so that the outer drum 22 will retract the soft rope two 24. At the same time, the inner drum 21 will release the soft rope one 23, and the other end of the retracted soft rope two 24 will pull the connecting plate 29 to drive the scraper 30 to move.

[0051] When the connecting plate 29 moves to the end and contacts the stand 25, the lower rotating rod 46 will eventually be difficult to continue rotating. In this way, the angle sensor 16 receives the signal that the lower rotating rod 46 stops rotating. At this time, the electric push rod 45 can be activated and the push plate 53 can be used to drive the movable rod 40 to move left (as shown in FIG. Figure 6 As shown, the left bevel gear 1 42 re-engages with the left lower bevel gear 50, and the left transmission gear 47 re-engages with the right-angle gear 48, causing the right-angle gear 48 to change its direction of rotation. This means that the outer drum 22 releases the cord 2 24, while the inner drum 21 retracts the cord 1 23.

[0052] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A sedimentation tank for a multi-stage filtration sewage treatment process, comprising a base (1) and a treatment cylinder (2), characterized in that: The treatment cylinder (2) is provided with a sewage treatment structure and a sludge aggregation structure inside; The sewage treatment structure comprises an intermediate cylinder (9), an inner cylinder (10), a bottom cylinder (14), a filter plate (7), a drainage pipe (4), a first mud discharge pipe (5), a second mud discharge pipe (6), and a water inlet pipe (13) arranged at the inner center of the treatment cylinder (2); The inner cylinder (10) is fixedly connected to the bottom cylinder (14), the intermediate cylinder (9) is located between the inner cylinder (10) and the treatment cylinder (2), and a sealing plate (12) is provided between the inner cylinder (10) and the inner wall of the intermediate cylinder (9), a water outlet hole (11) is provided on the upper surface of the inner cylinder (10), wherein the water outlet hole (11) is located below the sealing plate (12), and the filter plate (7) is located between the intermediate cylinder (9) and the treatment cylinder (2); The sludge gathering structure comprises an outer slide rail (26), an inner slide rail (27), a pulley (28), a connecting plate (29) and a scraper (30) at the bottom of the treatment cylinder (2); both ends of the outer slide rail (26) and the inner slide rail (27) are fixedly connected to a stand (25).

2. The sedimentation tank in the multi-stage filtration sewage treatment process according to claim 1, characterized in that: An edge ring (8) is sleeved on the inner surface of the treatment cylinder (2) and located above the filter plate (7), wherein one end of the drainage pipe (4) passes through the inner side of the edge ring (8), and an overflow pipe (3) is provided above the treatment cylinder (2), and the other end of the overflow pipe (3) passes through the top of the intermediate cylinder (9).

3. The sedimentation tank in the multi-stage filtration sewage treatment process according to claim 2, characterized in that: The bottom tube (14) is thin at the upper and lower ends and thick in the middle. The other end of the water inlet pipe (13) passes through the waist of the bottom tube (14) and is connected to the water outlet pipe (15). The two ends of the water outlet pipe (15) have opposite water outlet directions. One end of the mud discharge pipe 1 (5) passes through the bottom of the bottom tube (14), and one end of the mud discharge pipe 2 (6) passes through the bottom of the treatment tube (2). A support rod (18) is provided below the filter plate (7), and the support rod (18) is fixedly connected to the base (1).

4. The sedimentation tank in the multi-stage filtration sewage treatment process according to claim 1, characterized in that: The stand (25) is fixedly connected to the base (1), and the connecting plate (29) is located between the outer slide rail (26) and the inner slide rail (27).

5. The sedimentation tank in the multi-stage filtration sewage treatment process according to claim 4, characterized in that: There are four pulleys (28), which are respectively located at the four ends of the connecting plate (29). The bottom end of the connecting plate (29) is fixedly connected to the scraper (30), wherein connecting rods (31) are provided on both sides of the scraper (30), and the other end of the connecting rod (31) is connected to the lower surface of the connecting plate (29).

6. The sedimentation tank in the multi-stage filtration sewage treatment process according to claim 1, characterized in that: A driving box (19) is provided between the bottom end of the inner cylinder (10) and the middle cylinder (9), and an inner rotating cylinder (21) and an outer rotating cylinder (22) are provided below the driving box (19). A first soft rope (23) is wound around the surface of the inner rotating cylinder (21), and a second soft rope (24) is wound around the surface of the outer rotating cylinder (22). A smooth hole (20) is provided on the top of each of the two upright frames (25). The other end of the first soft rope (23) passes through the smooth hole (20) on the inner upright frame (25) and is connected to one end of the connecting plate (29). The other end of the second soft rope (24) passes through the smooth hole (20) on the outer upright frame (25) and is connected to the other end of the connecting plate (29).

7. The sedimentation tank in the multi-stage filtration sewage treatment process according to claim 6, characterized in that: The driving box (19) includes a sealed cavity (17) at the top, a connecting shaft (49) is provided through the bottom end of the sealed cavity (17), and the upper and lower ends of the connecting shaft (49) are respectively provided with a right-angle gear (48) and an outer bevel gear 3 (34), the surface of the inner rotating cylinder (21) is coaxially connected to the outer bevel gear 2 (33), and the surface of the outer rotating cylinder (22) is coaxially connected to the outer bevel gear 1 (32), and the outer bevel gear 3 (34) is respectively meshed with the outer bevel gear 1 (32) and the outer bevel gear 2 (33).

8. The sedimentation tank in the multi-stage filtration sewage treatment process according to claim 7, characterized in that: A fixed rotating rod (36) is provided inside the sealing cavity (17), water wheels (35) are sleeved on both ends of the fixed rotating rod (36), and a gear column (37) is sleeved on the middle surface of the fixed rotating rod (36); The interior of the sealing cavity (17) and the left and right sides of the right-angle gear (48) are fixedly connected with vertical plates (39), and a movable rotating rod (40) capable of moving left and right is provided above the vertical plates (39). The surface of the movable rotating rod (40) and the two limiting rings (43) are sleeved thereon, and the surface of the movable rotating rod (40) and the two limiting rings (43) are sleeved thereon, and a right bevel gear (41), a movable gear (38) and a left bevel gear (42) are sleeved thereon, wherein the movable gear (38) can always be meshed and connected with the gear column (37).

9. The sedimentation tank in the multi-stage filtration sewage treatment process according to claim 8, characterized in that: The left end of the movable rotating rod (40) is sleeved with two limiting rings (44), and the left end of the movable rotating rod (40) and the surface of the two limiting rings (44) are movably sleeved with a push plate (53). The interior of the sealed cavity (17) is also provided with an electric push rod (45), and the output shaft of the electric push rod (45) is fixedly connected to the other end of the push plate (53). The electric push rod (45) is used to drive the movable rotating rod (40) to move left or right.

10. The sedimentation tank in the multi-stage filtration sewage treatment process according to claim 9, characterized in that: A lower rotating rod (46) is provided between the two vertical plates (39) and below the movable rotating rod (40). Two limiting rings (52) are sleeved on the surface of the lower rotating rod (46) and between the two vertical plates (39). A left transmission gear (47), a lower bevel gear (50) and a right transmission gear (51) are sleeved on the surface of the lower rotating rod (46) and between the two limiting rings (52). An angle sensor (16) is provided on the right side of the interior of the sealed cavity (17), wherein the right end of the lower rotating rod (46) passes through the angle sensor (16).

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