Building sewage treatment device and method

Abstract

The invention discloses a building sewage treatment device and method, and belongs to the technical field of building sewage treatment.The building sewage treatment device comprises a mounting frame, a first treatment tank and a second treatment tank are fixedly mounted on the mounting frame, and filtering mechanisms are arranged at the upper ends of the first treatment tank and the second treatment tank; according to the sewage treatment device, the rotating shaft capable of moving up and down and the mounting cylinder matched with the rotating shaft are arranged, so that the working state can be changed by adjusting the height of the rotating shaft, the two treatment tanks independently operate or cooperatively work, and the adaptability and flexibility of the sewage treatment device are improved; when one treatment tank operates, energy and operation cost can be saved, and when a large amount of sewage is treated, the two treatment tanks work together, so that the treatment efficiency can be improved, the sewage can be quickly treated, and pollution to the environment is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of building sewage treatment, and in particular relates to a building sewage treatment device and method. Background Art

[0002] With the continuous acceleration of urbanization and the vigorous development of the construction industry, the amount of sewage generated during construction is also increasing, which needs to be treated by sewage treatment equipment. The Chinese patent announcement number CN116081786B discloses an environmentally friendly sewage treatment equipment for construction. The environmentally friendly sewage treatment equipment for construction has a high degree of automation and does not require frequent control of the circulation of sewage. The disinfectant can be put in line with the input of sewage, reducing waste.

[0003] The problem with the existing technology is that existing building sewage treatment devices often have only one fixed working mode, which means that in different scenarios, different sewage production amounts and different sewage compositions, these devices cannot flexibly adjust their working status to adapt to actual needs. For example, when the amount of sewage is large, the sewage treatment device with a single working mode will not be able to process such a large amount of sewage in time due to its limited processing capacity, resulting in sewage accumulation. When processing a small amount of sewage, a large amount of energy is still consumed, resulting in energy waste. Summary of the invention

[0004] In response to the problems existing in the prior art, the present invention provides a building sewage treatment device, which has the advantages of flexible adjustment, adaptability to different working scenarios, energy saving and improved efficiency, and solves the problems of the existing sewage treatment devices having a single working mode and low adaptability and flexibility.

[0005] The present invention is implemented as follows: a building sewage treatment device comprises a mounting frame, on which a first treatment tank and a second treatment tank are fixedly mounted, a filtering mechanism is arranged at the upper ends of the first treatment tank and the second treatment tank, the first treatment tank and the second treatment tank are connected via a connecting pipe, a discharge pipe is arranged at the bottom of the first treatment tank and the second treatment tank, the filtering mechanism at the upper end is arranged at the water outlet of the feed pipe, a stirring mechanism is arranged in the middle of the first treatment tank and the second treatment tank, the stirring mechanism comprises an electric telescopic rod and a mounting cylinder, a motor is installed at the output end of the electric telescopic rod, a rotating shaft is fixedly connected to the output end of the motor, the rotating shaft is sleeved in the mounting cylinder, and a plurality of mixing plates are arranged on the circumference of the mounting cylinder.

[0006] As a preferred embodiment of the present invention, the electric telescopic rod is fixedly installed on the top of the first processing tank, the output end of the electric telescopic rod is fixedly connected to the lifting plate, the motor is fixedly installed on the lifting plate, the two ends of the lifting plate are respectively slidably connected to the guide column, and the bottom of the guide column is fixedly connected to the top of the first processing tank.

[0007] As a preferred embodiment of the present invention, a connecting piece is rotatably installed on the shaft body, a rack is fixedly connected to one side of the connecting piece, the top of the rack is fixedly connected to the lower surface of the lifting plate, and two mounting tubes are provided, and the bottom is rotatably installed on the middle of the bottom inner wall of the first processing tank and the second processing tank respectively.

[0008] As a preferred embodiment of the present invention, a first limit block is fixedly connected to the inner wall of the mounting cylinder located in the first processing tank, a second limit block is fixedly connected to the inner wall of the mounting cylinder located in the second processing tank, and a first clamping block and a second clamping block are fixedly connected to the shaft bodies at the upper and lower ends of the rotating shaft, respectively, and the first clamping block and the second clamping block are respectively abutted against the side walls of the first limit block and the second limit block.

[0009] As a preferred embodiment of the present invention, the filtering mechanism includes a first filtering assembly and a second filtering assembly, and the first filtering assembly and the second filtering assembly are fixedly connected to a mounting shaft at one end close to the rotating shaft, and a gear is fixedly sleeved on the mounting shaft, and the gear is meshingly connected to the rack.

[0010] As a preferred embodiment of the present invention, fixed plates are provided on both sides of the first filter assembly and the second filter assembly, guide rods are slidably penetrated at both ends of the fixed plates, springs are sleeved on the guide rods, and baffles are fixedly connected to one end of the guide rod and the spring away from the fixed plate, and the baffles on both sides abut against both sides of the first filter assembly and the second filter assembly.

[0011] The present invention also provides a method for using a building sewage treatment device, which specifically comprises the following steps: The construction sewage is transported to the filter mechanism through the feed pipe, filtered by the filter mechanism, and then flows into the first treatment tank. The corresponding operation mode is selected according to the amount of construction sewage to be treated: S1: When the amount of sewage is large, open the valve on the connecting pipe to allow the sewage to flow into the first treatment tank and the second treatment tank, start the electric telescopic rod to drive the motor and the rotating shaft to move, so that the rotating shaft is clamped with the upper and lower mounting cylinders, and the motor is started to drive the rotating shaft to rotate, thereby driving the mixing plates in the first treatment tank and the second treatment tank to rotate synchronously, fully mixing the added flocculant with the sewage, adsorbing the suspended particles in the sewage to form larger flocs, accelerating the sedimentation of the particles, effectively removing fine suspended particles such as silt and clay, and making the treated water clearer; S2: When the amount of sewage is small and relatively turbid, open the valve on the connecting pipe, and the sewage is filtered by the upper filtering mechanism and enters the first treatment tank, and then filtered by the lower filtering mechanism, and then all enters the second treatment tank for mixing, realizing double-layer filtration. The rotating shaft is driven downward by the electric telescopic rod to disengage the rotating shaft from the clamping connection with the upper mounting cylinder and maintain the clamping connection with the lower mounting cylinder, and only the mixing plate in the second treatment tank rotates; S3: When the amount of sewage is small but relatively clear, close the valve on the connecting pipe. After the sewage is filtered by the upper filtering mechanism, it enters the first treatment tank for mixing. The rotating shaft is driven upward by the electric telescopic rod to disengage the rotating shaft from the clamping connection with the lower end mounting cylinder and maintain the clamping connection with the upper end mounting cylinder. Only the mixing plate in the first treatment tank rotates.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a rotating shaft that can move up and down and a mounting cylinder matched therewith, and can change the working state by adjusting the height of the rotating shaft, so that the two treatment tanks can operate independently or work together, thereby improving the adaptability and flexibility of the sewage treatment device. When one treatment tank is in operation, energy and operating costs can be saved. When treating a large amount of sewage, the two treatment tanks can work together to improve the treatment efficiency, ensure that the sewage can be quickly treated, and avoid pollution to the environment.

[0013] 2. By setting filters with different apertures, when treating a large amount of water, the sewage can be filtered through double layers of filters with different apertures, and the filtering effect is better. Since the aperture of the second filter is relatively large, it can avoid affecting the water inlet speed. When treating a small amount of water and it is relatively turbid, the double-layer filtration is maintained while adjusting the operating state to improve the filtering effect. When treating a small amount of water and it is relatively clear, the third filter is facing upward to ensure the filtering effect. After the sewage is filtered through the third filter, it is mixed with the agent in the first treatment tank to improve the treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the top view of the structure of the present invention; Figure 3 For the present invention Figure 1 Schematic diagram of the local structure; Figure 4 It is a schematic diagram of the three-dimensional structure of the first filter component and the second filter component of the present invention; Figure 5 For the present invention Figure 2 Schematic diagram of the three-dimensional structure of the middle AA section; Figure 6 For the present invention Figure 2 Schematic diagram of the three-dimensional structure of the middle BB section; Figure 7 For the present invention Figure 5 A magnified view of the structure at C in the middle; Figure 8 It is a schematic diagram of the local structure of the rotating shaft in the present invention; Fig. 9 It is a schematic diagram of the structure of the rotating shaft and the mounting cylinder in the present invention.

[0015] In the figure: 1. mounting frame; 2. stirring mechanism; 21. motor; 211. lifting plate; 212. guide column; 22. rotating shaft; 221. connecting piece; 222. rack; 223. first clamping block; 224. second clamping block; 23. electric telescopic rod; 24. mounting cylinder; 241. first limit block; 242. second limit block; 25. mixing plate; 3. filtering mechanism; 31. fixing plate; 32. guide rod; 33. spring; 34. baffle; 35. first filtering assembly; 351. frame; 352. first filter screen; 353. second filter screen; 354. third filter screen; 36. mounting shaft; 37. gear; 38. second filtering assembly; 4. first processing tank; 5. second processing tank; 6. feed pipe; 7. discharge pipe; 8. connecting pipe. DETAILED DESCRIPTION

[0016] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.

[0017] The structure of the present invention is described in detail below in conjunction with the accompanying drawings.

[0018] like Figures 1 to 9 As shown, a building sewage treatment device provided by an embodiment of the present invention includes a mounting frame 1, on which a first treatment tank 4 and a second treatment tank 5 are fixedly mounted, a filtering mechanism 3 is arranged at the upper end of the first treatment tank 4 and the second treatment tank 5, the first treatment tank 4 and the second treatment tank 5 are connected through a connecting pipe 8, a discharge pipe 7 is arranged at the bottom of the first treatment tank 4 and the second treatment tank 5, the upper end filtering mechanism 3 is arranged at the water outlet of the feed pipe 6, a stirring mechanism 2 is arranged in the middle of the first treatment tank 4 and the second treatment tank 5, the stirring mechanism 2 includes an electric telescopic rod 23 and a mounting cylinder 24, a motor 21 is installed at the output end of the electric telescopic rod 23, a rotating shaft 22 is fixedly connected to the output end of the motor 21, the rotating shaft 22 is sleeved in the mounting cylinder 24, and a plurality of mixing plates 25 are arranged on the circumference of the mounting cylinder 24.

[0019] Furthermore, the electric telescopic rod 23 is fixedly installed on the top of the first processing tank 4, the output end of the electric telescopic rod 23 is fixedly connected to the lifting plate 211, the motor 21 is fixedly installed on the lifting plate 211, the two ends of the lifting plate 211 are respectively slidably sleeved on the guide column 212, the bottom of the guide column 212 is fixedly connected to the top of the first processing tank 4, the shaft 22 is rotatably installed with a connecting piece 221, one side of the connecting piece 221 is fixedly connected to a rack 222, the top of the rack 222 is fixedly connected to the lower surface of the lifting plate 211, and the installation cylinder There are two 24, and the bottom is rotatably installed on the middle part of the bottom inner wall of the first processing tank 4 and the second processing tank 5 respectively. The first limit block 241 is fixedly connected to the inner wall of the installation cylinder 24 located in the first processing tank 4, and the second limit block 242 is fixedly connected to the inner wall of the installation cylinder 24 located in the second processing tank 5. The first clamping block 223 and the second clamping block 224 are fixedly connected to the shaft body at the upper and lower ends of the rotating shaft 22, respectively, and the first clamping block 223 and the second clamping block 224 are respectively abutted against the side walls of the first limit block 241 and the second limit block 242.

[0020] Specifically, two guide columns 212 are respectively arranged on both sides of the electric telescopic rod 23, the lifting plate 211 is slidably sleeved on the guide columns 212, the motor 21 is fixedly installed on the lifting plate 211, the upper end of the rotating shaft 22 passes through the top of the first treatment tank 4, and the lower end passes through the first treatment tank 4 and is inserted into the inside of the mounting cylinder 24 in the second treatment tank 5. One end of the connecting piece 221 is sleeve-shaped and rotatably sleeved on the rotating shaft 22. A retaining ring for limiting the upper and lower positions of the connecting piece 221 is provided on the rotating shaft 22. The mixing plate 25 is V-shaped, and the through holes on both sides are staggered. During the rotation process, the sewage enters the middle part of the V-shape through the through hole on one side, and flows out from the staggered through holes after being blocked, which can improve the stirring effect and efficiency.

[0021] During operation, the rotating shaft 22 is driven to move up and down through the telescopic movement of the electric telescopic rod 23, and the lifting plate 211 is lifted up and down along the guide column 212. The guide column 212 provides a stable guiding effect for the movement of the lifting plate 211, ensuring that it moves in a predetermined direction during the lifting process without deviation or shaking. The connecting piece 221 is rotatably sleeved on the rotating shaft 22, so that it will not rotate synchronously with the rotating shaft 22 when it rotates, and maintain a relatively independent state. The retaining ring plays a limiting role, so that the rotating shaft 22 drives the connecting piece 221 to move synchronously when it moves up and down, thereby driving the rack 222 to move synchronously. The top of the rack 222 is fixedly connected to the lifting plate 211, and one side is connected to the connecting piece 221, which ensures the stability of its engagement with the gear 37.

[0022] Specifically, when the output end of the electric telescopic rod 23 is extended to the middle, the bottom of the first clamping block 223 is flush with the bottom of the first limit block 241, and the top of the second clamping block 224 is flush with the top of the second limit block 242. When the rotating shaft 22 rotates, it drives the first clamping block 223 and the second clamping block 224 to rotate synchronously. Since the first clamping block 223 fits with the first limit block 241 and the second clamping block 224 fits with the second limit block 242, the two mounting cylinders 24 are driven to rotate synchronously, thereby rotating the mixing plates 25 in the first treatment tank 4 and the second treatment tank 5. When both the first treatment tank 4 and the second treatment tank 5 are treating sewage, the reagent can be stirred; When the output end of the electric telescopic rod 23 is extended to the longest, the first clamping block 223 and the second clamping block 224 move upward, the first clamping block 223 maintains contact with the first limit block 241, and the second clamping block 224 is out of contact with the second limit block 242. At this time, the rotating shaft 22 rotates, only driving the installation cylinder 24 in the first treatment tank 4 to rotate, and the installation cylinder 24 in the second treatment tank 5 does not rotate, which is suitable for the case where only the first treatment tank 4 treats sewage; When the output end of the electric telescopic rod 23 is contracted to the shortest, the first clamping block 223 and the second clamping block 224 move downward, the first clamping block 223 is out of contact with the first limit block 241, and the second clamping block 224 maintains contact with the second limit block 242. At this time, the rotating shaft 22 rotates, only driving the installation cylinder 24 in the second treatment tank 5 to rotate, and the installation cylinder 24 in the first treatment tank 4 does not rotate, which is suitable for the case where only the second treatment tank 5 treats sewage.

[0023] By making the two treatment tanks operate independently or work together, the working status can be flexibly adjusted according to the actual sewage treatment needs, thereby improving the adaptability and flexibility of the sewage treatment device. When one treatment tank is in operation, energy and operating costs can be saved. When treating a large amount of sewage, the two treatment tanks working together can improve the treatment efficiency, ensure that the sewage can be treated quickly, and avoid pollution to the environment.

[0024] Furthermore, the filtering mechanism 3 includes a first filtering assembly 35 and a second filtering assembly 38. The first filtering assembly 35 and the second filtering assembly 38 are fixedly connected to a mounting shaft 36 at one end close to the rotating shaft 22. A gear 37 is fixedly sleeved on the mounting shaft 36. The gear 37 is meshed and connected with the rack 222. The first filtering assembly 35 includes a frame 351. One end of the frame 351 is fixedly connected to the mounting shaft 36, and the other end is rotatably connected to the top of the first processing tank 4. The first filter screen 352, the second filter screen 353 and the first filter screen 354 are fixedly installed on the three adjacent sides of the frame 351. There are three filters 354, the aperture of the first filter 352 is the same as that of the second filter 353, and is larger than that of the third filter 354, the aperture of the second filter assembly 38 is the same as that of the third filter 354, and fixed plates 31 are provided on both sides of the first filter assembly 35 and the second filter assembly 38, and guide rods 32 are slidingly penetrated at both ends of the fixed plate 31, and a spring 33 is sleeved on the rod body of the guide rod 32, and a baffle 34 is fixedly connected to the end of the guide rod 32 and the spring 33 away from the fixed plate 31, and the baffles 34 on both sides abut against the first filter assembly 35 and the second filter assembly 38.

[0025] Specifically, the two ends of the baffles 34 on both sides are staggered and slidably matched, and a reserved notch is set in the middle. The installation shaft 36 and the shaft at the other end are located in the reserved notch. The baffles 34 on both sides are pressed against the first filter component 35 under the elastic force of the spring 33, and the two ends are closed. When the rack 222 moves up and down, the gear 37 rotates, driving the installation shaft 36 and the first filter component 35 to rotate synchronously. The first filter component 35 pushes the baffles 34 to both sides to shrink the spring 33. When the first filter component 35 returns to the normal state, the baffles 34 are pressed against the first filter component 35 again under the action of the spring 33 to avoid water leakage. The structures of the filtering mechanisms 3 at the upper and lower ends are generally the same. The difference is that the apertures of the three filter screens on the second filter component 38 are the same as the third filter screen 354.

[0026] When treating a large amount of water, the first treatment tank 4 and the second treatment tank 5 work simultaneously, the second filter screen 353 faces upward, and the sewage enters the first treatment tank 4 after being filtered by the second filter screen 353, and then enters the second treatment tank 5 after being filtered by the second filter assembly 38. Therefore, the sewage is filtered through two layers, and the filtering effect is better. Since the aperture of the second filter screen 353 is relatively large, it can avoid affecting the water inlet speed. When treating a small amount of turbid water, the electric telescopic rod 23 drives the rotating shaft 22 to move downward, so that the second filter 353 rotates to the right side, and the first filter 352 faces upward. The sewage is filtered by the first filter 352 and then filtered by the second filter assembly 38, thereby improving the filtering effect. When a smaller amount of water is to be treated and the water is relatively clear, the electric telescopic rod 23 drives the rotating shaft 22 to move upward, so that the second filter 353 rotates to the left side and the third filter 354 faces upward. After the sewage is filtered by the third filter 354, it is mixed with the reagent in the first treatment tank 4 to improve the treatment efficiency.

[0027] like Figure 1-Figure 9 As shown, a method for using a building sewage treatment device provided by an embodiment of the present invention comprises the following steps: The construction sewage is transported to the filter mechanism 3 through the feed pipe 6, filtered by the filter mechanism 3, and then flows into the first treatment tank 4. The corresponding operation mode is selected according to the amount of construction sewage to be treated: S1: When the amount of sewage is large, open the valve on the connecting pipe 8 to allow the sewage to flow into the first treatment tank 4 and the second treatment tank 5, start the electric telescopic rod 23 to drive the motor 21 and the rotating shaft 22 to move, so that the rotating shaft 22 is clamped with the upper and lower mounting tubes 24, and the rotating shaft 22 is driven by the motor 21 to rotate, and the rotating shaft 22 drives the first clamping block 223 and the second clamping block 224 to rotate synchronously. Since the first clamping block 223 fits with the first limit block 241, and the second clamping block 224 fits with the second limit block 242, the two mounting tubes 24 are driven to rotate synchronously, thereby rotating the mixing plates 25 in the first treatment tank 4 and the second treatment tank 5, fully mixing the added flocculant with the sewage, adsorbing the suspended particles in the sewage, forming larger flocs, accelerating the sedimentation of the particles, and effectively removing fine suspended particles such as silt and clay, so that the treated water quality is clearer; S2: When the amount of sewage is small and relatively turbid, the valve on the connecting pipe 8 is opened, and the sewage is filtered by the upper filtering mechanism 3 and enters the first treatment tank 4, and then filtered by the lower filtering mechanism 3 and enters the second treatment tank 5, realizing double-layer filtration. The rotating shaft 22 is driven downward by the electric telescopic rod 23, so that the first clamping block 223 and the second clamping block 224 move downward, the first clamping block 223 is separated from the contact with the first limit block 241, and the second clamping block 224 maintains the contact with the second limit block 242. At this time, the rotating shaft 22 rotates, and only the installation cylinder 24 in the second treatment tank 5 is driven to rotate, thereby reducing energy consumption; S3: When the amount of sewage is small but relatively clear, close the valve on the connecting pipe 8, and after the sewage is filtered by the upper filtering mechanism 3, it enters the first processing tank 4 for mixing, and the rotating shaft 22 is driven upward by the electric telescopic rod 23 to disengage the rotating shaft 22 from the clamping connection with the lower end mounting cylinder 24 and maintain the clamping connection with the upper end mounting cylinder 24. Only the mixing plate 25 in the first processing tank 4 rotates, so as to achieve rapid processing and save operating costs.

[0028] To sum up: this kind of building sewage treatment device, by providing a rotating shaft 22 that can move up and down and a mounting cylinder 24 that matches it, can change the working state by adjusting the height of the rotating shaft 22, so that the two treatment tanks can operate independently or work together, thereby improving the adaptability and flexibility of the sewage treatment device. When one treatment tank is in operation, energy and operating costs can be saved. When treating a large amount of sewage, the two treatment tanks working together can improve the treatment efficiency, ensure that the sewage can be quickly treated, and avoid pollution to the environment.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A building sewage treatment device, comprising a mounting frame (1), characterized in that: A first processing tank (4) and a second processing tank (5) are fixedly mounted on the mounting frame (1); a filtering mechanism (3) is arranged at the upper end of the first processing tank (4) and the second processing tank (5); the first processing tank (4) and the second processing tank (5) are connected via a connecting pipe (8); a discharge pipe (7) is arranged at the bottom of each of the first processing tank (4) and the second processing tank (5); the filtering mechanism (3) is arranged at the upper end at the water outlet of the feed pipe (6); a stirring mechanism (2) is arranged at the middle of the first processing tank (4) and the second processing tank (5); the stirring mechanism (2) comprises an electric telescopic rod (23) and a mounting cylinder (24); a motor (21) is mounted at the output end of the electric telescopic rod (23); a rotating shaft (22) is fixedly connected to the output end of the motor (21); the rotating shaft (22) is sleeved in the mounting cylinder (24); and a plurality of mixing plates (25) are arranged on the circumference of the mounting cylinder (24).

2. The construction sewage treatment device according to claim 1, characterized in that: The electric telescopic rod (23) is fixedly mounted on the top of the first processing tank (4); the output end of the electric telescopic rod (23) is fixedly connected to a lifting plate (211); the motor (21) is fixedly mounted on the lifting plate (211); both ends of the lifting plate (211) are respectively slidably sleeved on guide columns (212); and the bottom of the guide column (212) is fixedly connected to the top of the first processing tank (4).

3. The construction sewage treatment device according to claim 2, characterized in that: A connecting piece (221) is rotatably mounted on the shaft body of the rotating shaft (22); a rack (222) is fixedly connected to one side of the connecting piece (221); the top of the rack (222) is fixedly connected to the lower surface of the lifting plate (211); two mounting tubes (24) are provided, the bottoms of which are rotatably mounted on the middle of the bottom inner walls of the first processing tank (4) and the second processing tank (5), respectively.

4. The construction sewage treatment device according to claim 3, characterized in that: A first limit block (241) is fixedly connected to the inner wall of the mounting tube (24) located in the first processing tank (4), and a second limit block (242) is fixedly connected to the inner wall of the mounting tube (24) located in the second processing tank (5). A first clamping block (223) and a second clamping block (224) are respectively fixedly connected to the shaft bodies at the upper and lower ends of the rotating shaft (22), and the first clamping block (223) and the second clamping block (224) are respectively in contact with the side walls of the first limit block (241) and the second limit block (242).

5. The construction sewage treatment device according to claim 3, characterized in that: The filtering mechanism (3) comprises a first filtering assembly (35) and a second filtering assembly (38); one end of each of the first filtering assembly (35) and the second filtering assembly (38) close to the rotating shaft (22) is fixedly connected to a mounting shaft (36); a gear (37) is fixedly sleeved on the mounting shaft (36); and the gear (37) is meshingly connected to the rack (222).

6. The construction sewage treatment device according to claim 5, characterized in that: Both sides of the first filter assembly (35) and the second filter assembly (38) are provided with fixed plates (31), both ends of the fixed plates (31) are slidably penetrated by guide rods (32), a spring (33) is sleeved on the rod body of the guide rod (32), and a baffle (34) is fixedly connected to one end of the guide rod (32) and the spring (33) away from the fixed plate (31), and the baffles (34) on both sides abut against both sides of the first filter assembly (35) and the second filter assembly (38).

7. A method for building a sewage treatment plant, characterized in that: The construction sewage treatment device according to any one of claims 1 to 6 comprises the following steps: The construction sewage is transported to the filtering mechanism (3) through the feed pipe (6), filtered by the filtering mechanism (3), and then flows into the first treatment tank (4). The corresponding operation mode is selected according to the amount of construction sewage to be treated: S1: When the amount of sewage is large, the valve on the connecting pipe (8) is opened to allow the sewage to flow into the first treatment tank (4) and the second treatment tank (5), and the electric telescopic rod (23) is started to drive the motor (21) and the rotating shaft (22) to move, so that the rotating shaft (22) is engaged with both the upper and lower mounting cylinders (24). The motor (21) is started to drive the rotating shaft (22) to rotate, thereby driving the mixing plates (25) in the first treatment tank (4) and the second treatment tank (5) to rotate synchronously, fully mixing the added flocculant with the sewage, adsorbing the suspended particles in the sewage to form larger flocs, accelerating the sedimentation of the particles, effectively removing fine suspended particles such as silt and clay, and making the treated water clearer; S2: When the amount of sewage is small and relatively turbid, the valve on the connecting pipe (8) is opened, and the sewage is filtered by the upper filtering mechanism (3) and then enters the first treatment tank (4), and then is filtered by the lower filtering mechanism (3), and then all enters the second treatment tank (5) for mixing, thereby achieving double-layer filtration. The rotating shaft (22) is driven downward by the electric telescopic rod (23), so that the rotating shaft (22) is disengaged from the clamping connection with the upper mounting cylinder (24) and remains clamped with the lower mounting cylinder (24), and only the mixing plate (25) in the second treatment tank (5) rotates; S3: When the amount of sewage is small but relatively clear, the valve on the connecting pipe (8) is closed, and the sewage is filtered by the upper filtering mechanism (3) and then enters the first processing tank (4) for mixing. The rotating shaft (22) is driven upward by the electric telescopic rod (23), so that the rotating shaft (22) is disengaged from the clamping connection with the lower end mounting cylinder (24) and remains clamped with the upper end mounting cylinder (24), and only the mixing plate (25) in the first processing tank (4) rotates.

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