Sewage filtering structure of water-power engineering sand mixing system and vertical flow sewage filtering settling tank

Abstract

The utility model discloses a water-power engineering sand mixing system sewage filtering structure and a vertical flow sewage filtering sedimentation tank, and relates to the technical field of wastewater sedimentation, the water-power engineering sand mixing system sewage filtering structure comprises a supporting assembly, the supporting assembly comprises a top plate, a top frame and a bottom frame, and the two ends of the top frame are connected with the top plate and the bottom frame respectively; the cleaning assembly comprises a driving part, a cleaning part and a suspension part, the driving part is arranged at the top of the top plate, an output shaft of the driving part faces the bottom frame, the cleaning part is connected to the output shaft of the driving part, and the suspension part is connected to the top frame; the conveying assembly comprises a center pipe and an inlet pipe, the inlet pipe is connected to the side wall of the top of the center pipe, the center pipe is arranged at the bottom of the top plate, the containing assembly comprises a containing tank and a sludge hopper connected to the bottom end of the containing tank, and the top of the containing tank is connected with the top plate; the sedimentation tank disclosed by the utility model solves the problem that the operation of sludge backflow and sludge discharge is relatively complicated in the existing sedimentation tank.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater sedimentation, in particular to a sewage filtering structure of a sand mixing system of a hydropower project and a vertical flow sewage filtering sedimentation tank. Background Art

[0002] Vertical flow sedimentation tank, also known as vertical sedimentation tank, is a sedimentation tank in which wastewater flows vertically. The plane figure of the tank is circular or square. Water enters the tank from top to bottom through the water inlet pipe located in the center of the tank. An umbrella-shaped baffle is installed under the pipe to make the wastewater evenly distributed in the tank and then slowly rise along the entire water flow section. Suspended matter settles into the conical sedimentation hopper at the bottom of the tank, and clarified water flows out from the surrounding overflow weirs around the tank.

[0003] In small sewage treatment sites, due to limited investment, short construction period, and low excavation depth, the height of the sedimentation tank is often limited. In order to ensure sufficient sludge discharge under the condition of limited sedimentation tank height, one method is to set up multiple mud buckets at the bottom. This method is costly, and the operation of sludge return and sludge discharge is relatively complicated, or there are many electromechanical equipment such as sludge pumps, air compressors, water backwashing, and air backwashing systems, which requires a large workload for equipment maintenance and consumes a lot of energy; if only one mud bucket is set, the mud bucket area is large, there is a dead zone, and the sludge is not fully discharged. The remaining sludge in the sedimentation tank not only occupies the tank capacity, but also produces N2 due to denitrification reaction due to lack of oxygen. The N2 escape process will carry the sludge to float, resulting in more floating sludge in the effluent, and the effluent sensory and water quality are poor. In addition, due to differences in on-site construction technology levels, the horizontal accuracy of the foundation or base plate is difficult to meet the design requirements, which is easy to affect the sedimentation depth and thus the sedimentation effect. Utility Model Content

[0004] In view of the problem that the operation of sludge return and sludge discharge in the above-mentioned existing sedimentation tanks is relatively complicated, the present utility model is proposed.

[0005] Therefore, the utility model aims to provide a sewage filtering structure for a sand-mixing system of a hydropower project, which aims to assist in the smooth discharge of bottom sludge by setting a scraping and stirring mechanism.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions: a sewage filtering structure of a sand-mixing system of a hydropower project, which includes a supporting assembly, including a top plate, a top frame and a bottom frame, and the two ends of the top frame are respectively connected to the top plate and the bottom frame; a sewage cleaning assembly, including a driving member, a cleaning member and a suspension member, the driving member is arranged at the top of the top plate, and its output shaft faces the bottom frame, the cleaning member is connected to the output shaft of the driving member, and the suspension member is connected to the top frame; and a conveying assembly, including a central pipe and an inlet pipe, the inlet pipe is connected to the top side wall of the central pipe, and the central pipe is arranged at the bottom of the top plate.

[0007] As a preferred solution of the sewage filtering structure of the sand-mixing system of a hydropower project of the utility model, the top frame includes circumferentially arranged vertical beams and a first sliding ring fixed at the bottom thereof, and a top sealing plate is also connected to the top of the first sliding ring between the vertical beams; a matching slide is opened inside the vertical beam, and a first spring is fixed to the inner wall of the bottom end of the matching slide.

[0008] As a preferred solution of the sewage filtering structure of the sand mixing system of the hydropower project of the utility model, the suspended part includes a suspended filter plate and a sliding plate connected to its circumferential side wall, and the suspended filter plate is provided with at least one group of first filter holes, and a through hole is also provided in the middle thereof; the sliding plate is slidably inserted into the matching slideway and connected to the first spring.

[0009] As a preferred solution of the sewage filtering structure of the sand-mixing system of a hydropower project of the utility model, the bottom frame includes a circumferentially arranged support beam and a second sliding ring and a bottom mounting platform fixed at both ends thereof, and a fixed beam is fixed to the circumferential outer wall of the bottom mounting platform; a rotating slideway is formed between the first sliding ring and the second sliding ring.

[0010] As a preferred solution of the sewage filtration structure of the sand-mixed system of a hydropower project of the utility model, the fixed beam includes a fixed vertical plate and a top cross beam and a bottom cross beam vertically fixed at both ends thereof, and the other ends of the top cross beam and the bottom cross beam are respectively fixed to the vertical beam and the outer wall of the mounting platform.

[0011] As a preferred solution of the sewage filtering structure of the sand mixing system of the hydropower project of the utility model, wherein: the cleaning member includes a first scraper and a second scraper, the first scraper is arranged on the top of the second scraper; the first scraper includes a symmetrically arranged first scraper plate and a first connecting sleeve connected therebetween, a first set of holes is opened in the middle of the first connecting sleeve, and the inner wall of the first set of holes is symmetrically connected with a clamping strip.

[0012] As a preferred solution of the sewage filtering structure of the sand mixing system of the hydropower project of the utility model, the second scraper includes a second connecting sleeve and a connecting rod, a baffle, a sliding block and a second scraper symmetrically connected on both sides thereof in sequence, and the bottom end of the first scraper is fixed to the top of the connecting rod; a second set of holes is opened in the middle of the second connecting sleeve, and the second set of holes is coaxially arranged with the first set of holes, and the sliding block slides in cooperation in the rotating slideway.

[0013] As a preferred solution of the sewage filtering structure of the sand mixing system of the hydropower project of the utility model, wherein: a protective sleeve is fixedly connected to the top of the mounting platform, the rotating shaft connected to the output shaft of the driving member is rotatably inserted into the protective sleeve, and the circumferential outer wall of the rotating shaft close to the top plate is symmetrically connected with slots, and the clamping strip is fixedly clamped in the slots; the central tube includes a flow tube and a flow stabilizing tube, the flow stabilizing tube is fixed at the bottom of the flow tube, and the top of the flow tube is fixedly connected to the top plate; the flow tube is sleeved on the outside of the protective sleeve, and the bottom end of the flow stabilizing tube is connected to the top sealing plate.

[0014] As a preferred solution of the sewage filtering structure of the sand-mixing system of the hydropower project of the utility model, a separation filter plate is fixed on the inner wall of the circumferentially arranged support beam, a sinking hole is opened in the middle of the separation filter plate, and at least one group of second filter holes are opened inside the separation filter plate.

[0015] In order to solve the above technical problems, the utility model also provides the following technical solutions: a vertical flow filtration and sedimentation tank, which includes the above-mentioned filtration structure of the sand-mixing system of the hydropower project, and also includes a containing assembly, including a containing tank and a sludge hopper connected to the bottom end thereof, the top of the containing tank is connected to the top plate, and the cleaning assembly and the conveying assembly are both arranged in the conveying assembly; the outer wall of the top of the containing tank is respectively provided with a suspension discharge hole and a mounting hole, the inlet pipe is cooperated to pass through the mounting hole, the suspension discharge hole is connected to a first discharge pipe, and the bottom of the sludge hopper is connected to a second discharge pipe; the circumferential inner wall of the containing tank is provided with an installation slot, and the fixed vertical plate can be plugged and fixed in the installation slot.

[0016] Beneficial effects of the utility model:

[0017] By fixing the top plate on the top of the vertical flow tank, it is convenient to install and fix the subsequent top frame and bottom frame, which can fully stabilize the normal operation of the device as a whole; the cleaning part is driven by the driving part to rotate in the tank, and the cleaning part can remove the stubborn sludge on the inner wall of the tank. The suspension part can limit the larger suspended matter to the bottom of the tank to prevent the top sewage outlet from being blocked.

[0018] The sewage flows into the central pipe through the inlet pipe, and finally is discharged into the tank body from the bottom opening of the central pipe, which is convenient for the sedimentation and discharge of the sludge, and is discharged outside the holding tank through the sludge hopper. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0020] Figure 1 It is a schematic diagram of the overall structure of the sewage filtering structure of the sand-mixing system of a hydropower project of the utility model.

[0021] Figure 2 This is a schematic diagram of the support component structure of the sewage filtering structure of the sand-mixing system of a hydropower project of the utility model.

[0022] Figure 3 This is a schematic diagram of the structure of the pollution cleaning components of the sewage filtering structure of the sand-mixing system of a hydropower project according to the utility model.

[0023] Figure 4 This is a schematic diagram of the structure of the conveying components of the sewage filtering structure of the sand-mixing system of a hydropower project according to the utility model.

[0024] Figure 5 It is a schematic diagram of the overall structure of the vertical flow filter sedimentation tank of the utility model.

[0025] Figure 6 It is a schematic diagram of the internal structure of the vertical flow filter sedimentation tank of the utility model. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0029] Secondly, the utility model is described in detail with reference to the schematic diagram. When describing the embodiments of the utility model, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general proportion, and the schematic diagrams are only examples, which should not limit the scope of protection of the utility model. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0030] Example 1

[0031] Reference Figure 1, which is the first embodiment of the utility model, provides a sewage filtering structure for a sand-mixing system of a hydropower project, which includes a support assembly 100, including a top plate 101, a top frame 102 and a bottom frame 103, and the two ends of the top frame 102 are respectively connected to the top plate 101 and the bottom frame 103.

[0032] Among them, the top plate 101 is installed at the top opening of the sedimentation tank to play a supporting and sealing role. The top frame 102 is fixedly connected below the top plate 101, and the bottom frame 103 is installed below the top frame 102. In this embodiment, the support assembly 100 is preferably made of stainless steel structure as a whole, which must meet the support rigidity.

[0033] The cleaning component 200 includes a driving member 201, a cleaning member 202 and a suspension member 203. The driving member 201 is arranged on the top of the top plate 101, and its output shaft faces the bottom frame 103. The cleaning member 202 is connected to the output shaft of the driving member 201, and the suspension member 203 is connected to the top frame 102.

[0034] Among them, the driving part 201 preferably adopts a servo motor, which can flexibly drive the cleaning part 202 to rotate forward and reverse, and more efficiently remove the mud and dirt attached to the inner wall of the tank body. The suspension part 203 is slidably installed on the top frame 102, and can be passively raised or lowered according to the height of the dirt accumulated at the bottom.

[0035] The conveying assembly 300 includes a central tube 301 and an inlet tube 302 . The inlet tube 302 is connected to the top side wall of the central tube 301 . The central tube 301 is disposed at the bottom of the top plate 101 .

[0036] During use, sewage flows from the inlet pipe 302 into the central pipe 301, and is finally discharged into the vertical flow tank from the bottom of the central pipe 301. The sewage gradually fills the interior of the vertical flow tank from bottom to top, and the sludge, flocculent suspended matter or other dirt in the sewage settles at the bottom of the vertical flow tank. The lighter suspended matter also moves upward as the sewage rises and the height of the bottom accumulation changes.

[0037] Furthermore, the suspended matter with a light weight but a large volume is filtered by the suspension member 203 and is still piled up at the bottom of the tank body. After a long period of squeezing and piling up, it eventually forms muddy dirt and is discharged from the bottom sewage system.

[0038] Example 2

[0039] Reference Figure 1 to Figure 4, which is the second embodiment of the utility model. This embodiment is different from the first embodiment in that: the top frame 102 includes circumferentially arranged vertical beams 102a and a first sliding ring 102b fixed at the bottom thereof, and the top of the first sliding ring 102b between the vertical beams 102a is also connected to a top sealing plate 102c; a matching slide 102a-1 is opened inside the vertical beam 102a, and a first spring T1 is fixed to the inner wall of the bottom end of the matching slide 102a-1.

[0040] The suspension member 203 includes a suspension filter plate 203a and a sliding plate 203b connected to its circumferential side wall. The suspension filter plate 203a is provided with at least one group of first filter holes 203a-1, and a through hole 203a-2 is also provided in the middle thereof. The sliding plate 203b is slidably inserted into the matching slideway 102a-1 and connected to the first spring T1.

[0041] The top of the vertical beam 102a can be welded or connected to the bottom of the top plate 101 by bolts.

[0042] In the natural state, the suspended filter plate 203a is restricted in the middle of the vertical beam 102a by the action of the first spring T1. When it is pushed upward by the force, the first spring T1 is stretched.

[0043] Furthermore, the flocculent suspension with a lighter weight and a smaller volume passes through the first filter hole 203a-1 and is finally discharged from the top of the tank body, whereas the flocculent suspension with a larger volume is blocked by the suspension filter plate 203a at the bottom of the tank body.

[0044] The bottom frame 103 includes a circumferentially arranged support beam 103a and a second slide ring 103b and a bottom mounting platform 103c fixed at both ends thereof. A fixed beam 103c-1 is fixed to the circumferential outer wall of the bottom mounting platform 103c; a rotating slideway A is formed between the first slide ring 102b and the second slide ring 103b.

[0045] The fixed beam 103c-1 includes a fixed vertical plate 103c-1a and a top crossbeam 103c-1b and a bottom crossbeam 103c-1c vertically fixed at both ends thereof, and the other ends of the top crossbeam 103c-1b and the bottom crossbeam 103c-1c are respectively fixed to the vertical beam 102a and the outer wall of the mounting platform 103c.

[0046] The fixed beam 103c-1 fixes the vertical beam 102a and the bottom frame 103, and the bottom frame 103 and the top frame 102 form a whole to support the cleaning component 200 and ensure the normal operation of the cleaning part 202 and the suspension part 203.

[0047] The cleaning piece 202 includes a first scraper 202a and a second scraper 202b, and the first scraper 202a is arranged on the top of the second scraper 202b; the first scraper 202a includes a symmetrically arranged first scraper plate 202a-1 and a first connecting sleeve 202a-2 connected therebetween, a first set of holes 202a-2a is opened in the middle of the first connecting sleeve 202a-2, and the inner wall of the first set of holes 202a-2a is symmetrically connected with a clamping strip 202a-2b.

[0048] The second scraper 202b includes a second connecting sleeve 202b-1 and a connecting rod 202b-2, a baffle 202b-3, a sliding block 202b-4 and a second scraper 202b-5 symmetrically connected on both sides thereof. The bottom end of the first scraper 202a-1 is fixed to the top of the connecting rod 202b-2.

[0049] A second set of holes 202b-1a is opened in the middle of the second connecting sleeve 202b-1. The second set of holes 202b-1a is coaxially arranged with the first set of holes 202a-2a. The sliding block 202b-4 slides in the rotating slideway A.

[0050] A protective sleeve 103c-2 is fixedly connected to the top of the mounting platform 103c, and the rotating shaft 201a connected to the output shaft of the driving member 201 is rotatably inserted into the protective sleeve 103c-2. The circumferential outer wall of the rotating shaft 201a close to the top plate 101 is symmetrically connected with a slot 201a-1, and the clamping strip 202a-2b is fixedly clamped in the slot 201a-1.

[0051] During use, the driving member 201 is started, driving the rotating shaft 201a to rotate, and the clamping strip 202a-2b is vertically clamped in the slot 201a-1, so the rotating shaft 201a can further drive the first connecting sleeve 202a-2 to rotate. At this time, the first scraper 202a rotates as a whole outside the protective sleeve 103c-2.

[0052] Furthermore, the connecting rod 202b-2 in the second scraper 202b is fixed to the first scraper 202a-1 in the first scraper 202a, and the second connecting sleeve 202b-1 is rotatably sleeved outside the protective sleeve 103c-2, so the second scraper 202b should also rotate outside the protective sleeve 103c-2.

[0053] Furthermore, the sliding block 202b-4 rotates circumferentially in the rotating slideway A, and the rotating slideway A can maintain the overall height of the cleaning member 202, and during the rotation of the second scraper 202b, the second scraper 202b-5 moves inside the fixed beam 103c-1.

[0054] The center tube 301 includes a flow tube 301a and a flow stabilizing tube 301b. The flow stabilizing tube 301b is fixed at the bottom of the flow tube 301a, and the top of the flow tube 301a is fixedly connected to the top plate 101; the flow tube 301a is sleeved on the outside of the protective shaft sleeve 103c-2, and the bottom end of the flow stabilizing tube 301b is connected to the top sealing plate 102c.

[0055] A separation filter plate 103a-1 is fixed to the inner wall of the circumferentially arranged support beam 103a. A sinking hole 103a-1a is provided in the middle of the separation filter plate 103a-1, and at least one set of second filter holes 103a-1b is provided inside the separation filter plate 103a-1.

[0056] The sewage flows from the inlet pipe 302 to the flow pipe 301a, and finally is discharged from the opening of the flow stabilizing pipe 301b.

[0057] Furthermore, the opening of the flow stabilizing tube 301b is conical and diffuses outward, and the sewage diffuses and flows out from the center to the outside. The sludge in the sewage falls downward from the sinking hole 103a-1a and gradually accumulates at the bottom of the tank. The separation filter plate 103a-1 can squeeze the gradually accumulated sludge flat.

[0058] Furthermore, the remaining sewage, along with the dirt, flows upward from the gaps such as the rotating slideway A, and then passes through the first filter hole 203a-1 of the suspended filter plate 203a and is discharged from the top.

[0059] The remaining structures are the same as those of Example 1.

[0060] Example 3

[0061] Reference Figure 1 to Figure 6 , which is the third embodiment of the utility model. This embodiment is different from the second embodiment in that it provides a vertical flow filtration and sedimentation tank, which includes the filtration structure of the hydropower engineering sand mixing system in the above embodiment, and also includes a containing component 400, including a containing tank 401 and a sludge hopper 402 connected to its bottom end, the top of the containing tank 401 is connected to the top plate 101, and the cleaning component 200 and the conveying component 300 are both arranged in the conveying component 300.

[0062] The top outer wall of the holding tank 401 is respectively provided with a suspension discharge hole 401a and a mounting hole 401b, and the inlet pipe 302 passes through the mounting hole 401b. The suspension discharge hole 401a is connected to a first discharge pipe 401a-1, and the bottom of the sludge hopper 402 is connected to a second discharge pipe 402a.

[0063] The sewage enters the central pipe 301 from the inlet pipe 302, the heavier sludge is discharged from the second discharge pipe 402a at the bottom, and the sewage filtered by the suspension 203 is discharged from the first discharge pipe 401a-1.

[0064] A mounting slot 401c is provided on the circumferential inner wall of the container 401, and the fixed vertical plate 103c-1a can be inserted and fixed in the mounting slot 401c.

[0065] When installing the bottom frame 103 , align the fixed vertical plate 103 c - 1 a of the fixed beam 103 c - 1 with the installation slot 401 c and insert it, and push the fixed beam 103 c - 1 upwards. At this time, the bottom frame 103 will be pushed into the containing tank 401 .

[0066] Furthermore, due to the vertical insertion and fixation of the installation slot 401c and the fixed vertical plate 103c-1a, combined with the fixation of the top of the vertical beam 102a and the top plate 101, the support assembly 100 can be ensured to be installed smoothly.

[0067] The remaining structure is the same as that of Example 2.

[0068] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A sewage filtration structure for a sand-mixing system of a hydropower project, characterized by: include, A support assembly (100) comprises a top plate (101), a top frame (102) and a bottom frame (103), wherein two ends of the top frame (102) are respectively connected to the top plate (101) and the bottom frame (103); A dirt cleaning assembly (200) comprises a driving member (201), a cleaning member (202) and a suspension member (203), wherein the driving member (201) is arranged on the top of the top plate (101), and its output shaft faces the bottom frame (103), the cleaning member (202) is connected to the output shaft of the driving member (201), and the suspension member (203) is connected to the top frame (102); and; The conveying assembly (300) comprises a central tube (301) and an inlet tube (302), wherein the inlet tube (302) is connected to the top side wall of the central tube (301), and the central tube (301) is arranged at the bottom of the top plate (101).

2. The sewage filtering structure of the sand-mixing system of a hydropower project according to claim 1 is characterized by: The top frame (102) comprises circumferentially arranged vertical beams (102a) and a first sliding ring (102b) fixed at the bottom thereof, and a top sealing plate (102c) is also connected to the top of the first sliding ring (102b) between the vertical beams (102a); A matching slideway (102a-1) is provided inside the vertical beam (102a), and a first spring (T1) is fixed to the inner wall of the bottom end of the matching slideway (102a-1).

3. The sewage filtering structure of the sand-mixing system of a hydropower project according to claim 2 is characterized by: The suspension member (203) comprises a suspension filter plate (203a) and a sliding plate (203b) connected to the circumferential side wall thereof, the suspension filter plate (203a) is provided with at least one group of first filter holes (203a-1), and a through hole (203a-2) is also provided in the middle thereof; The sliding plate (203b) is slidably inserted into the matching slideway (102a-1) and connected to the first spring (T1).

4. The sewage filtering structure of the sand-mixing system of a hydropower project according to claim 2 or 3, characterized in that: The bottom frame (103) comprises a circumferentially arranged support beam (103a) and a second sliding ring (103b) and a bottom mounting platform (103c) fixed at both ends thereof, and a fixed beam (103c-1) is fixed on the circumferential outer wall of the bottom mounting platform (103c); A rotating slideway (A) is formed between the first slide ring (102b) and the second slide ring (103b).

5. The sewage filtering structure of the sand-mixing system of a hydropower project according to claim 4 is characterized by: The fixed beam (103c-1) comprises a fixed vertical plate (103c-1a) and a top crossbeam (103c-1b) and a bottom crossbeam (103c-1c) vertically fixed at both ends thereof, and the other ends of the top crossbeam (103c-1b) and the bottom crossbeam (103c-1c) are respectively fixed to the vertical beam (102a) and the outer wall of the mounting platform (103c).

6. The sewage filtering structure of the sand-mixing system of a hydropower project according to claim 5 is characterized by: The cleaning member (202) comprises a first scraping member (202a) and a second scraping member (202b), wherein the first scraping member (202a) is arranged on the top of the second scraping member (202b); The first scraper (202a) comprises a symmetrically arranged first scraper plate (202a-1) and a first connecting sleeve (202a-2) connected therebetween; a first set of holes (202a-2a) is provided in the middle of the first connecting sleeve (202a-2); and a clamping strip (202a-2b) is symmetrically connected to the inner wall of the first set of holes (202a-2a).

7. The sewage filtering structure of the sand-mixing system of a hydropower project according to claim 6 is characterized by: The second scraper (202b) comprises a second connecting sleeve (202b-1) and a connecting rod (202b-2), a baffle (202b-3), a sliding block (202b-4) and a second scraper (202b-5) symmetrically connected on both sides thereof in sequence, and the bottom end of the first scraper (202a-1) is fixed to the top of the connecting rod (202b-2); A second set of holes (202b-1a) is provided in the middle of the second connecting sleeve (202b-1), the second set of holes (202b-1a) is coaxially arranged with the first set of holes (202a-2a), and the sliding block (202b-4) slides in the rotating slideway (A).

8. The sewage filtering structure of the sand-mixing system of a hydropower project according to claim 6 or 7, characterized in that: The top of the mounting platform (103c) is fixedly connected with a protective sleeve (103c-2); the rotating shaft (201a) connected to the output shaft of the driving member (201) is rotatably inserted into the protective sleeve (103c-2); the circumferential outer wall of the rotating shaft (201a) on one side close to the top plate (101) is symmetrically connected with a slot (201a-1); and the clamping strip (202a-2b) is fixedly clamped in the slot (201a-1); The central tube (301) comprises a flow tube (301a) and a flow stabilizing tube (301b), wherein the flow stabilizing tube (301b) is fixed to the bottom of the flow tube (301a), and the top of the flow tube (301a) is fixedly connected to the top plate (101); The flow tube (301a) is sleeved on the outside of the protective shaft sleeve (103c-2), and the bottom end of the flow stabilizing tube (301b) is connected to the top sealing plate (102c).

9. The sewage filtering structure of the sand-mixing system of a hydropower project according to claim 8 is characterized by: A separation filter plate (103a-1) is fixed to the inner wall of the circumferentially arranged support beam (103a), a sinking hole (103a-1a) is provided in the middle of the separation filter plate (103a-1), and at least one group of second filter holes (103a-1b) is provided inside the separation filter plate (103a-1).

10. A vertical flow filtration sedimentation tank, characterized in that: The method comprises the sewage filtering structure of the sand-mixing system of a hydropower project as claimed in any one of claims 5 to 9, and further comprises: The containing assembly (400) comprises a containing tank (401) and a sludge hopper (402) connected to the bottom end thereof, the top of the containing tank (401) is connected to the top plate (101), and the cleaning assembly (200) and the conveying assembly (300) are both arranged in the conveying assembly (300); The top outer wall of the holding tank (401) is respectively provided with a suspension discharge hole (401a) and a mounting hole (401b); the inlet pipe (302) passes through the mounting hole (401b); the suspension discharge hole (401a) is connected to a first discharge pipe (401a-1); and the bottom of the sludge hopper (402) is connected to a second discharge pipe (402a); The circumferential inner wall of the containing tank (401) is provided with a mounting slot (401c), and the fixed vertical plate (103c-1a) can be plugged and fixed in the mounting slot (401c).

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