Sludge discharging device for sewage treatment

Abstract

The application relates to the sewage treatment technical field, and particularly discloses a sludge discharging device for sewage treatment, which comprises a box body, a stirring tank is arranged at the upper end of the box body, a water outlet pipe is arranged on the side wall of the box body, a stirring assembly is arranged in the stirring tank, and a separation mechanism is arranged in the box body; sewage is added into the stirring tank; the stirring assembly in the application can strip the sludge wrapped on the surface of the stone, thereby reducing the separation difficulty of the subsequent sludge and the stone, improving the separation effect of the sludge and the stone, the stirred sewage enters into the box body, the separation mechanism can separate the sludge and the stone and respectively output to the outside of the box body, thereby realizing the separation of the sludge and the stone in the sewage, improving the resource recovery efficiency, reducing the disposal cost, and the water outlet pipe can discharge the upper layer water in the bottom of the box body after the separation.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a sludge discharge device for wastewater treatment. Background Technology

[0002] Wastewater refers to waste water containing organic matter, heavy metals, pathogens, sludge, and stones discharged from domestic and industrial production. If discharged directly without treatment, it will lead to eutrophication of water bodies, accumulation of heavy metals in soil, and the spread of diseases such as cholera. Therefore, wastewater must be treated to meet standards before it can be discharged. Effective separation of sludge and stones in wastewater during wastewater treatment is the core link in realizing the secondary utilization of resources. Organic sludge can be converted into biogas through anaerobic digestion, and inorganic stones can be crushed into aggregates for building materials. However, existing technologies are difficult to achieve efficient separation, resulting in resource waste and increased disposal costs.

[0003] In existing technologies, sludge removal devices for wastewater treatment mainly employ a combination of a chain-plate scraper and an air-lift sludge removal system. The structure includes an inclined sedimentation tank, a rotary scraper, and a submersible pump, with rigid connections between the components. The sludge is pumped to the dewatering workshop, where a motor-driven sprocket moves the scraper along a track at the bottom of the tank. The collected sludge flows through a sludge collection pit into the pump inlet and is then transported to the filter press via a flanged steel pipe. While this device enables continuous sludge discharge, it cannot distinguish stones within the sludge, leading to frequent damage to the filter cloth in the subsequent dewatering machine and increased maintenance costs.

[0004] Regarding the aforementioned technologies, since both the scraper and the submersible pump are indiscriminate conveying structures, they may not be able to separate sludge from stones during the sludge discharge process. When the mixed sludge enters the dewatering equipment, the sharp edges of the stones will scratch the filter cloth, leading to increased maintenance costs. Furthermore, the calorific value of the mixed sludge cannot meet the requirements for incineration power generation, and the stones cannot be recycled, resulting in both sludge and stones losing their utilization value. Therefore, improvements are needed. Utility Model Content

[0005] In order to separate sludge from stones in sewage, this application provides a sludge discharge device for sewage treatment.

[0006] The sludge removal device for wastewater treatment provided in this application adopts the following technical solution:

[0007] A sludge discharge device for sewage treatment includes a housing, an inlet on the inner top wall of the housing, a mixing tank above the inlet, a water outlet pipe on the side wall of the housing, a mixing assembly for peeling sludge off the surface of stones inside the mixing tank, and a separation mechanism for separating sludge from stones in sewage and discharging them separately inside the housing.

[0008] By adopting the above technical solution, wastewater is added to the mixing tank. The mixing component in this application can peel off the sludge covering the surface of the stones, thereby reducing the difficulty of subsequent separation of sludge and stones, improving the separation effect and efficiency of sludge and stones. The mixed wastewater enters the tank through the inlet. The separation mechanism can separate the sludge and stones in the wastewater and output them to the outside of the tank respectively, thereby realizing the separation of sludge and stones in the wastewater, improving resource recovery efficiency, and reducing disposal costs. After separation, the outlet pipe can discharge the upper layer of water at the bottom of the tank.

[0009] Optionally, the stirring assembly includes a first drive motor, a rotating shaft, and stirring rods. The first drive motor is disposed above the stirring tank. The rotating shaft is fixedly connected to the output end of the first drive motor. The rotating shaft is rotatably installed inside the stirring tank and passes through the inner top wall of the stirring tank. Multiple sets of stirring rods are provided, and the multiple sets of stirring rods are spaced apart on the outer peripheral wall of the rotating shaft.

[0010] By adopting the above technical solution, the first drive motor is started, and the output end of the first drive motor rotates to drive the rotating shaft to rotate. The rotation of the rotating shaft drives multiple sets of stirring rods to rotate, thereby peeling off the sludge covering the surface of the stone, reducing the binding force between the sludge and the stone, reducing the difficulty of subsequent separation of sludge and stone, and improving the separation effect and efficiency of sludge and stone.

[0011] Optionally, the separation mechanism includes a second drive motor, a first propeller blade, a separation cylinder, and a sludge discharge assembly. The second drive motor is disposed on the side wall of the housing. A stone discharge pipe is disposed on the side wall of the housing away from the second drive motor. The separation cylinder is inclinedly disposed in the housing and one end is connected to the stone discharge pipe. The first propeller blade is rotatably installed in the separation cylinder. The output end of the second drive motor passes through the side wall of the housing and the end of the separation cylinder and is fixedly connected to the end of the first propeller blade near the second drive motor. Multiple sets of sludge discharge grids are formed on the outer peripheral wall of the separation cylinder. The sludge discharge assembly is disposed in the housing and is used to discharge sludge from the sewage to the outside of the housing.

[0012] By adopting the above technical solution, the second drive motor is started, and the output end of the second drive motor rotates to drive the first propeller blade to rotate. The rotation of the first propeller blade can output sludge and stones in the separation cylinder. During output, sludge and sewage can be discharged at the sludge discharge grid, and stones can be discharged at the stone discharge pipe, thereby separating sludge and stones in sewage and outputting stones to the outside of the tank, thereby improving resource recycling efficiency. The inclined installation of the separation cylinder can improve the separation effect of sludge and stones.

[0013] Optionally, the sludge discharge assembly includes a third drive motor, a second propeller blade, and a sludge discharge cylinder. The third drive motor is disposed on the side wall of the housing and located below the second drive motor. A sludge discharge channel is provided on the side wall of the housing away from the third drive motor. The sludge discharge cylinder is fixedly disposed in the housing and one end is connected to the sludge discharge channel. The second propeller blade is rotatably installed inside the sludge discharge cylinder. The output end of the third drive motor is disposed through the side wall of the housing and the end of the sludge discharge cylinder and is fixedly connected to the end of the second propeller blade near the third drive motor. Multiple sets of drainage holes are provided on the outer peripheral wall of the sludge discharge cylinder.

[0014] By adopting the above technical solution, the third drive motor is started, and the output end of the third drive motor rotates to drive the second propeller blade to rotate. The rotation of the second propeller blade can output sludge in the sludge discharge cylinder. During the output, the sewage in the sludge can be discharged through the drain hole, and the sludge can be discharged through the sludge discharge channel. This achieves the filtering out of sludge from sewage and discharges the sludge to the outside of the tank, thereby improving the quality of recycled resources and reducing disposal costs.

[0015] Optionally, a water pump is provided on one side of the housing, the water inlet of the water pump is connected to the bottom of the housing, and the water outlet of the water pump is connected to a spray pipe, which is located above the separation cylinder.

[0016] By adopting the above technical solution, the water pump is started, which can transport the bottom water in the tank to the spray pipe. The spray pipe can wash the stones in the separation cylinder, thereby reducing the sludge residue on the surface of the stones, further improving the separation effect between sludge and stones, and improving the cleanliness of the stones.

[0017] Optionally, an elastic telescopic rod is provided on the side wall of the sludge discharge channel, and a top plate is fixedly connected to the telescopic end of the elastic telescopic rod. The top plate is located at the end of the sludge discharge cylinder away from the third drive motor.

[0018] By adopting the above technical solution, when the sludge is transported to the end of the sludge discharge cylinder near the sludge discharge channel, the top plate can prevent the sludge from being discharged directly under the action of the elastic telescopic rod. When the second propeller blade continuously outputs sludge, it can squeeze the sludge in the sludge discharge cylinder, thereby further dewatering the sludge and reducing the sludge moisture content. When the force of the sludge at the end separates the top plate from the sludge discharge channel, the sludge can be discharged at the sludge discharge channel.

[0019] Optionally, the connection between the separation cylinder and the sludge discharge cylinder and the side wall of the box body is provided with a sludge-blocking strip to prevent the accumulation of stones and sludge.

[0020] By adopting the above technical solution, the sludge barrier strip can prevent stones and sludge from accumulating at the connection between the separation cylinder and the sludge discharge cylinder and the side wall of the tank, thereby improving the separation effect of sludge and stones and reducing the frequency of maintenance and cleaning difficulty.

[0021] Optionally, scrapers are provided at the ends of the multiple sets of stirring rods away from the rotating shaft.

[0022] By adopting the above technical solution, the rotation of the stirring rod can drive the scraper to rotate synchronously. The rotation of the scraper can scrape off the sludge adhering to the inner wall of the mixing tank, thereby reducing the impact of the adhering sludge on subsequent processes and reducing cleaning costs.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The stirring assembly in this application can peel off the sludge covering the surface of the stones. When the first drive motor is started, the output end of the first drive motor rotates, which drives the rotating shaft to rotate. The rotation of the rotating shaft drives multiple sets of stirring rods to rotate, thereby peeling off the sludge covering the surface of the stones, reducing the binding force between the sludge and the stones, reducing the difficulty of subsequent separation of sludge and stones, and improving the separation effect and efficiency of sludge and stones.

[0025] 2. The separation mechanism in this application can separate sludge and stones in sewage and output them separately. When the second drive motor is started, the output end of the second drive motor rotates, which drives the first propeller blade to rotate. The rotation of the first propeller blade can output sludge and stones in the separation cylinder. During output, sludge and sewage can be discharged at the sludge discharge grid, and stones can be discharged at the stone discharge pipe, thereby realizing the separation of sludge and stones in sewage and outputting stones to the outside of the tank, thereby improving resource recycling efficiency. The inclined installation of the separation cylinder can improve the separation effect of sludge and stones.

[0026] 3. The sludge discharge assembly in this application can output sludge from the sewage to the outside of the tank. When the third drive motor is started, the output end of the third drive motor rotates, which drives the second propeller to rotate. The rotation of the second propeller can output the sludge from the sludge discharge cylinder. During the output, the sewage in the sludge can be discharged through the drain hole, and the sludge can be discharged through the sludge discharge channel, thereby filtering out the sludge from the sewage and discharging the sludge to the outside of the tank, thereby improving the quality of the recycled resources and reducing the disposal cost.

[0027] 4. The water pump and spray pipe in this application can use the bottom water in the tank to wash the stones. When the water pump is started, it can deliver the bottom water in the tank to the spray pipe, which can wash the stones in the separation cylinder, thereby reducing the sludge remaining on the surface of the stones, further improving the separation effect between sludge and stones, and improving the cleanliness of the stones. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0030] Figure 2 yes Figure 1 Partial structural diagram;

[0031] Figure 3 This is a schematic diagram of another part of the structure.

[0032] Reference numerals: 1. Box body; 11. Feed inlet; 12. Mixing tank; 13. Water outlet pipe; 2. Mixing assembly; 21. First drive motor; 22. Rotating shaft; 23. Mixing rod; 231. Scraper; 3. Separation mechanism; 31. Second drive motor; 32. First propeller blade; 33. Separation cylinder; 34. Stone discharge pipe; 35. Sludge discharge grid; 4. Sludge discharge assembly; 41. Third drive motor; 42. Second propeller blade; 43. Sludge discharge cylinder; 44. Sludge discharge channel; 45. Drainage hole; 5. Water pump; 51. Spray pipe; 6. Elastic telescopic rod; 61. Top plate; 7. Sludge barrier strip. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0034] This application discloses a sludge removal device for wastewater treatment, referring to... Figure 1 , Figure 2 and Figure 3 The sludge removal device for sewage treatment includes a box body 1. An inlet 11 is provided on the inner top wall of the box body 1. A mixing tank 12 is fixedly installed above the inlet 11. A water outlet pipe 13 is fixedly installed on the side wall of the box body 1. A mixing assembly 2 is installed inside the mixing tank 12. A separation mechanism 3 is installed inside the box body 1.

[0035] Wastewater is added to the mixing tank 12. In this embodiment, the mixing component 2 can peel off the sludge covering the surface of the stones, thereby reducing the difficulty of subsequent separation of sludge and stones, improving the separation effect and efficiency of sludge and stones. The mixed wastewater enters the tank 1 through the feed inlet 11. The separation mechanism 3 can separate the sludge and stones in the wastewater and output them to the outside of the tank 1 respectively, thereby realizing the separation of sludge and stones in the wastewater, improving resource recovery efficiency, and reducing disposal costs. After separation, the outlet pipe 13 can discharge the upper layer of water at the bottom of the tank 1.

[0036] Reference Figure 2 To reduce the binding force between sludge and stones in sewage, the stirring assembly 2 in this embodiment includes a first drive motor 21, a rotating shaft 22, and stirring rods 23. The first drive motor 21 is bolted to the top of the mixing tank 12. The rotating shaft 22 is fixedly connected to the output end of the first drive motor 21. The rotating shaft 22 is rotatably installed inside the mixing tank 12 and penetrates the inner top wall of the mixing tank 12. Multiple sets of stirring rods 23 are provided, and multiple sets of stirring rods 23 are welded to the outer peripheral wall of the rotating shaft 22 at intervals.

[0037] When wastewater is added into the mixing tank 12, the first drive motor 21 is started. The output end of the first drive motor 21 rotates, which drives the rotating shaft 22 to rotate. The rotation of the rotating shaft 22 drives multiple sets of stirring rods 23 to rotate, thereby peeling off the sludge covering the surface of the stones, reducing the binding force between the sludge and the stones, reducing the difficulty of subsequent separation of sludge and stones, and improving the separation effect and efficiency of sludge and stones.

[0038] Reference Figure 2 and Figure 3 When the stirred wastewater enters the tank 1, the sludge and stones need to be separated, and the separated stones and sludge are output separately. Therefore, the separation mechanism 3 in this embodiment includes a second drive motor 31, a first propeller blade 32, a separation cylinder 33, and a sludge discharge assembly 4. The second drive motor 31 is bolted to the side wall of the tank 1. A stone discharge pipe 34 is fixedly installed on the side wall of the tank 1 away from the second drive motor 31. The separation cylinder 33 is installed at an angle inside the tank 1, and one end is connected to the stone discharge pipe 34. The first propeller blade 32 is rotatably installed inside the separation cylinder 33. The output end of the second drive motor 31 is set through the side wall of the tank 1 and the end of the separation cylinder 33, and is fixedly connected to the end of the first propeller blade 32 near the second drive motor 31. Multiple sets of sludge discharge grids 35 are opened on the outer peripheral wall of the separation cylinder 33. The sludge discharge assembly 4 is installed inside the tank 1.

[0039] The second drive motor 31 is started, and the output end of the second drive motor 31 rotates, which drives the first propeller blade 32 to rotate. The rotation of the first propeller blade 32 can output sludge and stones in the separation cylinder 33. During output, sludge and sewage can be discharged at the sludge discharge grid 35, and stones can be discharged at the stone discharge pipe 34, thereby separating sludge and stones in sewage and outputting stones to the outside of the box 1, thereby improving resource recycling efficiency. The inclined installation of the separation cylinder 33 can improve the separation effect of sludge and stones. In this embodiment, the separation mechanism 3 is provided in two sets, which are adjacent and parallel to each other. In addition, the two sets of separation mechanisms 3 can improve the separation efficiency of sludge and stones.

[0040] Reference Figure 2 and Figure 3 In this embodiment, the sludge discharge assembly 4 can filter out sludge from sewage and discharge the sludge to the outside of the housing 1. It includes a third drive motor 41, a second propeller blade 42, and a sludge discharge cylinder 43. The third drive motor 41 is bolted to the side wall of the housing 1 and is located below the second drive motor 41. A sludge discharge channel 44 is fixedly installed on the side wall of the housing 1 away from the third drive motor 41. The sludge discharge cylinder 43 is fixedly installed inside the housing 1 and one end is connected to the sludge discharge channel 44. The second propeller blade 42 is rotatably installed inside the sludge discharge cylinder 43. The output end of the third drive motor 41 is set through the side wall of the housing 1 and the end of the sludge discharge cylinder 43 and is fixedly connected to the end of the second propeller blade 42 near the third drive motor 41. Multiple sets of drainage holes 45 are opened on the outer peripheral wall of the sludge discharge cylinder 43.

[0041] When wastewater enters the sludge discharge cylinder 43, the third drive motor 41 is started. The output end of the third drive motor 41 rotates, which drives the second propeller blade 42 to rotate. The rotation of the second propeller blade 42 can output the sludge from the sludge discharge cylinder 43. During the output, the wastewater in the sludge can be discharged through the drain hole 45, and the sludge can be discharged through the sludge discharge channel 44. This achieves the filtration of sludge from the wastewater and discharges the sludge to the outside of the tank 1, thereby improving the quality of the recycled resources and reducing the disposal cost.

[0042] Reference Figure 1 and Figure 2 After the stones are separated from the sludge, a small amount of sludge may remain on the surface of the stones. Therefore, in this embodiment, a water pump 5 is fixedly installed on one side of the tank 1. The water inlet of the water pump 5 is connected to the bottom of the tank 1, and the water outlet of the water pump 5 is connected to a spray pipe 51. The spray pipe 51 is fixedly installed above the separation cylinder 33. When the water pump 5 is started, the water pump 5 can transport the bottom water in the tank 1 to the spray pipe 51. The spray pipe 51 can rinse the stones in the separation cylinder 33, thereby reducing the sludge remaining on the surface of the stones, further improving the separation effect between sludge and stones, and improving the cleanliness of the stones.

[0043] Reference Figure 2 and Figure 3 To further dewater the sludge, an elastic telescopic rod 6 is fixedly installed on the side wall of the sludge discharge channel 44 in this embodiment. The telescopic end of the elastic telescopic rod 6 is fixedly connected to a top plate 61. The top plate 61 is located at the end of the sludge discharge cylinder 43 away from the third drive motor 41. When the sludge is transported to the end of the sludge discharge cylinder 43 near the sludge discharge channel 44, the top plate 61 can prevent the sludge from being discharged directly under the action of the elastic telescopic rod 6. When the second propeller blade 42 continuously outputs sludge, it can squeeze the sludge in the sludge discharge cylinder 43, thereby further dewatering the sludge and reducing the sludge moisture content. When the force of the sludge at the end separates the top plate 61 from the sludge discharge channel 44, the sludge can be discharged at the sludge discharge channel 44.

[0044] Reference Figure 2 and Figure 3 Sludge and stones may accumulate at the connection between the separation cylinder 33 and the sludge discharge cylinder 43 and the side wall of the box body 1. Therefore, in this embodiment, a mud-blocking strip 7 is fixedly installed at the connection between the separation cylinder 33 and the sludge discharge cylinder 43 and the side wall of the box body 1 to prevent the accumulation of stones and sludge. The mud-blocking strip 7 can prevent stones and sludge from accumulating at the connection between the separation cylinder 33 and the sludge discharge cylinder 43 and the side wall of the box body 1, thereby improving the separation effect of sludge and stones, reducing the frequency of maintenance and cleaning difficulty. In this embodiment, mud-blocking strips 7 are also provided at the connection between the two sets of separation cylinders 33 and the two sets of sludge discharge cylinders 43 to prevent stones and sludge from accumulating at the connection between the two sets of separation cylinders 33 and the two sets of sludge discharge cylinders 43.

[0045] Reference Figure 2 In order to scrape off the sludge adhering to the inner wall of the mixing tank 12, scraper 231 is welded to the ends of the multiple sets of stirring rods 23 away from the rotating shaft 22 in this embodiment. The rotation of the stirring rods 23 can drive the scraper 231 to rotate synchronously. The rotation of the scraper 231 can scrape off the sludge adhering to the inner wall of the mixing tank 12, thereby reducing the impact of the adhering sludge on subsequent processes and reducing cleaning costs.

[0046] The implementation principle of a sludge removal device for wastewater treatment according to an embodiment of this application is as follows:

[0047] The first drive motor 21 is started. The output end of the first drive motor 21 rotates, which drives the rotating shaft 22 to rotate. The rotation of the rotating shaft 22 drives multiple sets of stirring rods 23 to rotate, thereby peeling off the sludge covering the surface of the stone, reducing the binding force between the sludge and the stone, reducing the difficulty of subsequent separation of sludge and stone, and improving the separation effect and efficiency of sludge and stone.

[0048] When the stirred wastewater enters the tank 1, the second drive motor 31 is started. The output end of the second drive motor 31 rotates, which drives the first propeller blade 32 to rotate. The rotation of the first propeller blade 32 can output sludge and stones in the separation cylinder 33. During the output, sludge and wastewater can be discharged at the sludge discharge grid 35, and stones can be discharged at the stone discharge pipe 34, thereby separating sludge and stones in wastewater and outputting stones to the outside of the tank 1, thereby improving resource recycling efficiency. The inclined installation of the separation cylinder 33 can improve the separation effect of sludge and stones.

[0049] The third drive motor 41 is started. The output end of the third drive motor 41 rotates, which drives the second propeller blade 42 to rotate. The rotation of the second propeller blade 42 can output sludge into the sludge discharge cylinder 43. During the output, the sewage in the sludge can be discharged through the drain hole 45, and the sludge can be discharged through the sludge discharge channel 44, thereby filtering out the sludge from the sewage and discharging the sludge to the outside of the box 1, thereby improving the quality of the recycled resources and reducing the disposal cost.

[0050] Start the water pump 5. The water pump 5 can transport the bottom water in the tank 1 to the spray pipe 51. The spray pipe 51 can wash the stones in the separation cylinder 33, thereby reducing the sludge residue on the surface of the stones, further improving the separation effect between sludge and stones, and improving the cleanliness of the stones.

[0051] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0052] The above are all optional embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sludge removal device for wastewater treatment, characterized in that: The container includes a box (1), an inlet (11) is provided on the inner top wall of the box (1), a mixing tank (12) is provided above the inlet (11), a water outlet pipe (13) is provided on the side wall of the box (1), a mixing assembly (2) for peeling off the sludge covering the surface of the stones is provided in the mixing tank (12), and a separation mechanism (3) for separating the sludge and stones in the sewage and outputting them separately is provided in the box (1).

2. The sludge removal device for wastewater treatment according to claim 1, characterized in that: The stirring assembly (2) includes a first drive motor (21), a rotating shaft (22) and stirring rods (23). The first drive motor (21) is located above the stirring tank (12). The rotating shaft (22) is fixedly connected to the output end of the first drive motor (21). The rotating shaft (22) is rotatably installed inside the stirring tank (12) and passes through the inner top wall of the stirring tank (12). Multiple sets of stirring rods (23) are provided, and multiple sets of stirring rods (23) are spaced apart on the outer peripheral wall of the rotating shaft (22).

3. The sludge removal device for wastewater treatment according to claim 1, characterized in that: The separation mechanism (3) includes a second drive motor (31), a first propeller blade (32), a separation cylinder (33), and a sludge discharge assembly (4). The second drive motor (31) is disposed on the side wall of the housing (1). A stone discharge pipe (34) is disposed on the side wall of the housing (1) away from the second drive motor (31). The separation cylinder (33) is inclinedly disposed inside the housing (1) and one end is connected to the stone discharge pipe (34). The first propeller blade (32) is rotatably installed inside the separation cylinder (33). The output end of the second drive motor (31) passes through the side wall of the housing (1) and the end of the separation cylinder (33) and is fixedly connected to the end of the first propeller blade (32) near the second drive motor (31). Multiple sets of sludge discharge grids (35) are opened on the outer peripheral wall of the separation cylinder (33). The sludge discharge assembly (4) is disposed inside the housing (1) and is used to discharge sludge in sewage to the outside of the housing (1).

4. A sludge removal device for wastewater treatment according to claim 3, characterized in that: The sludge discharge assembly (4) includes a third drive motor (41), a second propeller blade (42), and a sludge discharge cylinder (43). The third drive motor (41) is disposed on the side wall of the housing (1) and located below the second drive motor (31). A sludge discharge channel (44) is provided on the side wall of the housing (1) away from the third drive motor (41). The sludge discharge cylinder (43) is fixedly disposed inside the housing (1) and one end is connected to the sludge discharge channel (44). The second propeller blade (42) is rotatably installed inside the sludge discharge cylinder (43). The output end of the third drive motor (41) is disposed through the side wall of the housing (1) and the end of the sludge discharge cylinder (43) and is fixedly connected to the end of the second propeller blade (42) near the third drive motor (41). Multiple sets of drainage holes (45) are opened on the outer peripheral wall of the sludge discharge cylinder (43).

5. A sludge removal device for wastewater treatment according to claim 3, characterized in that: A water pump (5) is provided on one side of the box (1). The water inlet of the water pump (5) is connected to the bottom of the box (1), and the water outlet of the water pump (5) is connected to a spray pipe (51). The spray pipe (51) is located above the separation cylinder (33).

6. A sludge removal device for wastewater treatment according to claim 4, characterized in that: An elastic telescopic rod (6) is provided on the side wall of the sludge discharge channel (44). The telescopic end of the elastic telescopic rod (6) is fixedly connected to a top plate (61). The top plate (61) is located at the end of the sludge discharge cylinder (43) away from the third drive motor (41).

7. A sludge removal device for wastewater treatment according to claim 4, characterized in that: The connection between the separation cylinder (33) and the sludge discharge cylinder (43) and the side wall of the box body (1) is provided with a mud-blocking strip (7) to prevent the accumulation of stones and sludge.

8. A sludge removal device for wastewater treatment according to claim 2, characterized in that: Each of the multiple sets of stirring rods (23) has a scraper (231) at the end away from the rotating shaft (22).

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