Landfill leachate pretreatment device

Abstract

The utility model discloses a landfill leachate pretreatment device, and relates to the technical field of landfill leachate pretreatment, the landfill leachate pretreatment device senses the water level in a filter tank through a water level sensing assembly so as to judge whether the filter tank is blocked or not, and drives a suction mechanism, a sewage storage tank and a brushing mechanism to move back and forth through a moving mechanism; the brushing mechanism attaches filtered matters on the bottom surface of the inner wall of the filter box to the surface of the brushing mechanism when the brushing mechanism attaches to the bottom wall of the filter box and rotates while moving back and forth, and the filtered matters attached to the surface of the brushing mechanism are scraped by the front and back scrapers and retained in the dirt storage box, and are finally sucked and discharged by the suction mechanism; according to the technical scheme, the working state of the filter box does not need to be manually monitored, it can be ensured that the filter box can continuously and stably filter the landfill leachate, and the situation that after the filter box is blocked, workers cannot find and treat the landfill leachate in time, and consequently the leachate overflows and cannot smoothly enter a sludge pool for standing and settling is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of garbage leachate pretreatment, in particular to a garbage leachate pretreatment device. Background Art

[0002] Leachate refers to a high-concentration organic wastewater formed by the seepage of the garbage layer and the covering soil layer in the landfill. Compared with general urban sewage, leachate has the characteristics of higher metal content, large changes in water quality and quantity, higher ammonia nitrogen content, and imbalance in the proportion of microbial nutrients. Therefore, the leachate cannot be treated together with urban sewage and needs to be purified separately. Before treating the leachate, it needs to be pretreated in order to reduce the workload of subsequent equipment.

[0003] In the prior art, a Chinese patent with authorization announcement number CN219929848U discloses a pretreatment device for leachate, which allows impurities in the leachate to precipitate in a sludge tank. Because the sludge pipe fits the inclined side wall of the sludge tank, the precipitation will not block the sludge pipe, and the sludge pump will pump out the precipitated sludge; large particles of impurities in the leachate are filtered by the filter screen, and when the filter screen needs to be cleaned, the upper cover is opened, and a tool is used to hook the pull ring to take out the filter screen; the leachate discharged from the outlet pipe is filtered by the filter screen cylinder, so that the residual impurities in the leachate are filtered to obtain pure leachate.

[0004] The above-mentioned existing technical solutions have the following defects: there is a lack of detection mechanism and automatic cleaning mechanism for whether the filter is blocked. When the filter is blocked, the staff cannot find and deal with it in time, resulting in leachate overflowing and unable to smoothly enter the sludge tank for static sedimentation.

[0005] For this purpose, a landfill leachate pretreatment device is proposed. Utility Model Content

[0006] The purpose of the utility model is to solve the problems mentioned in the above background technology, and provide a garbage leachate pretreatment device.

[0007] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:

[0008] The garbage leachate pretreatment device comprises an outer box body, on the inner wall surface of the outer box body, a static box and a filter box are fixedly installed, the filter box is arranged directly above the static box, a box cover is fixedly installed on the top surface of the filter box, a suction mechanism is penetrated through the surface of the box cover, an input end of the suction mechanism is fixedly connected to a dirt storage box, a brushing mechanism for brushing the bottom wall of the filter box is arranged on the lower end surface of the dirt storage box, scrapers are fixedly installed on the lower ends of the front and rear side surfaces of the inner wall of the dirt storage box, the upper ends of the scrapers are located in the dirt storage box and the upper ends are arranged in contact with the side surfaces of the brushing mechanism, a moving mechanism for driving the suction mechanism to move forward and backward is arranged on the top surface of the box cover, a liquid inlet pipe is fixedly inserted on the surface of the box cover and a water level sensing component is fixedly installed on the bottom surface, a solenoid valve is arranged on the surface of the liquid inlet pipe, and a liquid discharge component is fixedly installed on the surface of the outer box body.

[0009] Furthermore, the suction mechanism includes a storage box, which is slidably mounted on the top surface of the box cover, a fan is fixedly mounted on the top wall of the storage box, a filter is fixedly mounted on the top surface of the inner wall of the storage box, a suction pipe is fixedly mounted on the bottom surface of the storage box, the bottom end of the suction pipe is fixedly mounted on the top wall of the dirt storage box, a sealing door is hinged on the front side of the storage box, and the sealing door and the surface of the storage box are provided with buckles for fixing the sealing door.

[0010] Furthermore, the brushing mechanism includes a motor box, which is fixedly installed on the side of the dirt storage box. A first motor is fixedly installed inside the motor box. A rotating shaft is fixedly connected to the output end of the first motor. The rotating shaft is rotatably installed between the left and right side walls of the dirt storage box. A roller brush for brushing the bottom wall of the filter box is fixedly mounted on the surface of the rotating shaft, and the upper end of the scraper is arranged to fit the side of the roller brush.

[0011] Furthermore, the moving mechanism includes a slide groove, a through groove and a second motor, the slide groove and the through groove are both opened on the top surface of the box cover, the suction tube is slidably arranged relative to the inner wall surface of the through groove, the number of the slide grooves is two, the second motor is fixedly installed on the outer surface of the outer box body, the output end of the second motor is fixedly connected to a threaded rod, the threaded rod is rotatably arranged relative to the front and rear side surfaces of the inner wall of the slide groove on one side and the side wall of the outer box body, a slider is slidably installed on the inner wall surface of the slide groove, the storage box is fixedly installed on the top surface of the slider, and the surface of the threaded rod is threadedly connected to the slider.

[0012] Furthermore, the water level sensing component includes a mounting tube and a pressure sensor, the mounting tube is fixedly installed on the bottom surface of the box cover, the pressure sensor is fixedly installed on the bottom surface of the mounting tube, and the drainage component includes a drainage pipe, the drainage pipe is fixedly inserted into the side wall of the outer box body, and a drainage pump is provided on the surface of the drainage pipe.

[0013] Furthermore, the static box includes a bucket-shaped box body, a sludge extraction pipe and a sludge extraction pump. The bucket-shaped box body is fixedly installed on the inner wall surface of the outer box body and is arranged directly below the filter box. The sludge extraction pipe passes through the side wall of the outer box body and the side wall of the bucket-shaped box body. The sludge extraction pipe is located at one end inside the bucket-shaped box body and is arranged close to the bottom of the bucket-shaped box body. The sludge extraction pump is arranged on the surface of the sludge extraction pipe.

[0014] The beneficial effects of the utility model are as follows:

[0015] The water level in the filter box is sensed by the water level sensing component to determine whether the filter box is blocked. The moving mechanism drives the suction mechanism, the dirt storage box and the brushing mechanism to move forward and backward. The brushing mechanism adheres to the bottom wall of the filter box while rotating and moving forward and backward. The filtered material on the bottom of the inner wall of the filter box is attached to its own surface. The scrapers arranged at the front and back are used to scrape the filtered material attached to the surface of the brushing mechanism and retain it in the dirt storage box. Finally, it is sucked out by the suction mechanism. There is no need to manually monitor the working status of the filter box to ensure that the filter box can continuously and stably filter the leachate, so as to avoid the situation where the staff cannot find and deal with the blockage of the filter box in time, resulting in the leachate overflowing and unable to smoothly enter the sludge pool for static sedimentation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0017] Figure 2 It is a front cross-sectional view of the three-dimensional structure of the utility model;

[0018] Figure 3 This is a front cross-sectional view of the three-dimensional structure of the utility model sewage storage box;

[0019] Figure 4 It is a partial right side sectional view of the three-dimensional structure of the dirt storage box of the utility model;

[0020] 1. Outer box; 2. Filter box; 3. Box cover; 4. Suction mechanism; 401. Storage box; 402. Fan; 403. Filter; 404. Suction pipe; 405. Sealing door; 406. Buckle; 5. Dirt storage box; 6. Brushing mechanism; 601. Motor box; 602. First motor; 603. Rotating shaft; 604. Rolling brush; 7. Scraper; 8. Moving mechanism; 801. Slide; 802. Through groove; 803. Second motor; 804. Threaded rod; 805. Sliding block; 9. Water level sensing assembly; 901. Mounting pipe; 902. Pressure sensor; 10. Liquid inlet pipe; 11. Solenoid valve; 12. Standing box; 121. Bucket-shaped box; 122. Silt extraction pipe; 123. Silt extraction pump; 13. Drainage assembly; 131. Drainage pipe; 132. Drainage pump. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0024] The electrical components mentioned in this article are all connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device for controlling a computer or the like.

[0025] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] like Figures 1 to 4As shown, the garbage leachate pretreatment device comprises an outer box body 1, on the inner wall surface of the outer box body 1, a static box 12 and a filter box 2 are fixedly installed, the filter box 2 is arranged just above the static box 12, a box cover 3 is fixedly installed on the top surface of the filter box 2, a suction mechanism 4 is penetrated on the surface of the box cover 3, a dirt storage box 5 is fixedly connected to the input end of the suction mechanism 4, a brushing mechanism 6 for brushing the bottom wall of the filter box 2 is arranged on the lower end surface of the dirt storage box 5, scrapers 7 are fixedly installed on the lower ends of the front and rear sides of the inner wall of the dirt storage box 5, the upper ends of the scrapers 7 are located in the dirt storage box 5 and the upper ends are arranged in contact with the side of the brushing mechanism 6, a moving mechanism 8 for driving the suction mechanism 4 to move forward and backward is arranged on the top surface of the box cover 3, a liquid inlet pipe 10 is fixedly inserted on the surface of the box cover 3, and a water level sensing component 9 is fixedly installed on the bottom surface, a solenoid valve 11 is arranged on the surface of the liquid inlet pipe 10, and a liquid discharge component 13 is fixedly installed on the surface of the outer box body 1.

[0027] More specifically, when the filter box 2 is blocked, the water level in the filter box 2 rises, and when the leachate contacts the water level sensing component 9 and is sensed by the water level sensing component 9, the water level sensing component 9 controls the solenoid valve 11 to close through an external controller to prevent the leachate from continuing to enter the filter box 2, and at the same time, the moving mechanism 8, the suction mechanism 4 and the brushing mechanism 6 are turned on, and the suction mechanism 4, the dirt storage box 5 and the brushing mechanism 6 are driven by the moving mechanism 8 to move forward and backward. The brushing mechanism 6 adheres to the bottom wall of the filter box 2 while rotating and moving forward and backward, so that the filtered material on the bottom surface of the inner wall of the filter box 2 is attached to its own surface, thereby cleaning and unblocking the filter box 2, and the filtered material is brought to the inside of the dirt storage box 5 under the action of inertia. Since the upper ends of the scrapers 7 on the front and rear sides are both arranged to fit the side of the brushing mechanism 6, when the brushing mechanism 6 is transferred into the dirt storage box 5 The scraper 7 will not scrape off the objects carried on the surface of the brushing mechanism 6. When the brushing mechanism 6 rotates out of the dirt storage box 5, the filtered objects carried on its surface will be scraped off by the scraper 7, so that the filtered objects remain in the dirt storage box 5, and the filtered objects in the dirt storage box 5 are extracted by the suction action of the suction mechanism 4, which is convenient for centralized cleaning. There is no need to manually monitor the working status of the filter box 2, so as to ensure that the filter box 2 can continuously and stably filter the garbage leachate, and avoid the situation where the staff cannot find and deal with the blockage of the filter box 2 in time, resulting in the overflow of the leachate and unable to smoothly enter the sludge pool for static sedimentation. The filtered garbage leachate enters the static box 12 for static sedimentation, and then the clarified leachate overflows the static box 12 into the outer box body 1, and is finally extracted through the drainage component 13 to transport the leachate to subsequent treatment equipment.

[0028] The suction mechanism 4 includes a storage box 401, which is slidably installed on the top surface of the box cover 3, a fan 402 is fixedly installed on the top wall of the storage box 401, a filter 403 is fixedly installed on the top surface of the inner wall of the storage box 401, a suction pipe 404 is fixedly inserted on the bottom surface of the storage box 401, and the bottom end of the suction pipe 404 is fixedly inserted on the top wall of the dirt storage box 5, a sealing door 405 is hinged on the front side of the storage box 401, and a buckle 406 for fixing the sealing door 405 is provided on the surface of the sealing door 405 and the storage box 401.

[0029] Specifically, after the fan 402 is turned on, the wind force generated will suck the filtered material in the dirt storage box 5 into the storage box 401 through the suction pipe 404 for storage. The filter plate 403 is used to prevent the filtered material from being discharged through the fan 402. When the filtered material stored in the storage box 401 needs to be cleaned, the buckle 406 is disconnected so that the sealing door 405 can rotate relative to the storage box 401, and the inside of the storage box 401 can be cleaned.

[0030] The brushing mechanism 6 includes a motor box 601, which is fixedly installed on the side of the dirt storage box 5. A first motor 602 is fixedly installed inside the motor box 601. A rotating shaft 603 is fixedly connected to the output end of the first motor 602. The rotating shaft 603 is rotatably installed between the left and right side walls of the dirt storage box 5. A roller brush 604 for brushing the bottom wall of the filter box 2 is fixedly mounted on the surface of the rotating shaft 603, and the upper end of the scraper 7 is arranged to fit the side of the roller brush 604.

[0031] Specifically, after the first motor 602 is turned on, it drives the rotating shaft 603 and the roller brush 604 to rotate. The roller brush 604 scrapes the bottom surface of the inner wall of the filter box 2, so that the filtered material on the bottom surface of the inner wall of the filter box 2 adheres to the surface of the roller brush 604, and the side of the roller brush 604 that rotates toward the inside of the dirt storage box 5 will not be scraped by the scraper 7, while the side of the roller brush 604 that rotates toward the outside of the dirt storage box 5 will be scraped by the scraper 7, so that the filtered material attached to the surface of the roller brush 604 can be scraped off and remain inside the dirt storage box 5, and finally sucked and cleaned by the suction mechanism 4.

[0032] The moving mechanism 8 includes a slide groove 801, a through groove 802 and a second motor 803. The slide groove 801 and the through groove 802 are both opened on the top surface of the box cover 3. The suction tube 404 is slidably arranged relative to the inner wall surface of the through groove 802. There are two slide grooves 801. The second motor 803 is fixedly installed on the outer surface of the outer box body 1. The output end of the second motor 803 is fixedly connected with a threaded rod 804. The threaded rod 804 is rotatably arranged relative to the front and rear side surfaces of the inner wall of the slide groove 801 on one side and the side wall of the outer box body 1. A slider 805 is slidably installed on the inner wall surface of the slide groove 801. The storage box 401 is fixedly installed on the top surface of the slider 805. The surface of the threaded rod 804 is threadedly connected to the slider 805.

[0033] Specifically, the through groove 802 is used for smooth movement of the suction tube 404. When the second motor 803 is turned on, its output end drives the threaded rod 804 to rotate. Since the threaded rod 804 is threadedly connected to the slider 805 and the slider 805 is slidably installed in the slide groove 801, the rotation of the threaded rod 804 will drive the slider 805 to slide back and forth along the inner wall surface of the slide groove 801, and then drive the storage box 401 fixedly installed on the top surface of the slider 805 to move back and forth, and finally realize the synchronous movement of the suction mechanism 4, the dirt storage box 5, the brushing mechanism 6 and the scraper 7 back and forth.

[0034] The water level sensing component 9 includes a mounting tube 901 and a pressure sensor 902. The mounting tube 901 is fixedly mounted on the bottom surface of the box cover 3. The pressure sensor 902 is fixedly mounted on the bottom surface of the mounting tube 901. The drainage component 13 includes a drainage pipe 131. The drainage pipe 131 is fixedly inserted into the side wall of the outer box body 1. A drainage pump 132 is provided on the surface of the drainage pipe 131.

[0035] Specifically, when the filter box 2 is blocked but the leachate continues to enter the filter box 2 through the liquid inlet pipe 10, the water level in the filter box 2 will rise. When the water level rises to the point where it contacts the pressure sensor 902, the pressure sensor 902 senses the pressure and generates a corresponding sensor signal. After the signal is transmitted to the external controller, the external controller controls the solenoid valve 11 to close, preventing the leachate from continuing to enter the filter box 2 and overflowing. At the same time, the suction mechanism 4, the brushing mechanism 6, and the moving mechanism 8 are controlled to start working. When the leachate after standing overflows from the standing box 12 into the outer box body 1, the leachate is sucked by the drainage pump 132 and discharged to the subsequent processing equipment through the drainage pipe 131.

[0036] The static box 12 includes a bucket-shaped box body 121, a silt extraction pipe 122 and a silt extraction pump 123. The bucket-shaped box body 121 is fixedly installed on the inner wall surface of the outer box body 1 and is arranged directly below the filter box 2. The silt extraction pipe 122 penetrates the side wall of the outer box body 1 and the side wall of the bucket-shaped box body 121. The silt extraction pipe 122 is located at one end inside the bucket-shaped box body 121 and is arranged close to the bottom of the bucket-shaped box body 121. The silt extraction pump 123 is arranged on the surface of the silt extraction pipe 122.

[0037] Specifically, the leachate filtered by the filter box 2 continues to fall into the bucket-shaped box 121. After being fully stationary in the bucket-shaped box 121, solid matter is deposited at the bottom of the bucket-shaped box 121. Therefore, the sediment at the bottom of the bucket-shaped box 121 is sucked out by the cooperation of the sludge extraction pump 123 and the sludge extraction pipe 122. The leachate continues to enter the bucket-shaped box 121 for stationary. As the amount of deposited solid matter increases, the water level will gradually rise, and eventually overflow from the bucket-shaped box 121 into the outer box 1.

[0038] In summary: the water level in the filter box 2 is sensed by the water level sensing component 9 to determine whether the filter box 2 is blocked, and the suction mechanism 4, the dirt storage box 5 and the brushing mechanism 6 are driven to move forward and backward through the moving mechanism 8. The brushing mechanism 6 adheres to the bottom wall of the filter box 2 while rotating and moving forward and backward, and the filtered material on the bottom surface of the inner wall of the filter box 2 is attached to its own surface. The scrapers 7 arranged at the front and back are used to scrape the filtered material attached to the surface of the brushing mechanism 6 and retain it in the dirt storage box 5, and finally it is sucked out by the suction mechanism 4. There is no need to manually monitor the working status of the filter box 2, so as to ensure that the filter box 2 can continuously and stably filter the garbage leachate, and avoid the situation that the staff cannot find and deal with the blockage of the filter box 2 in time, resulting in the leachate overflowing and unable to smoothly enter the sludge pool for static sedimentation.

[0039] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the utility model. The utility model may be subject to various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A landfill leachate pretreatment device, characterized in that: The invention comprises an outer box body (1), wherein a stationary box (12) and a filter box (2) are fixedly mounted on the inner wall surface of the outer box body (1), wherein the filter box (2) is arranged directly above the stationary box (12), wherein a box cover (3) is fixedly mounted on the top surface of the filter box (2), wherein a suction mechanism (4) is provided through the surface of the box cover (3), wherein the input end of the suction mechanism (4) is fixedly connected to a dirt storage box (5), wherein a brushing mechanism (6) for brushing the bottom wall of the filter box (2) is provided on the lower end surface of the dirt storage box (5), wherein the dirt storage box (5) is provided with a brushing mechanism (6) for brushing the bottom wall of the filter box (2 ... A scraper (7) is fixedly installed at the lower ends of the front and rear side surfaces of the wall, the upper end of the scraper (7) is located in the dirt storage box (5) and the upper end is arranged in contact with the side of the brushing mechanism (6), the top surface of the box cover (3) is provided with a moving mechanism (8) for driving the suction mechanism (4) to move forward and backward, the surface of the box cover (3) is fixedly inserted with a liquid inlet pipe (10) and the bottom surface is fixedly installed with a water level sensing component (9), the surface of the liquid inlet pipe (10) is provided with a solenoid valve (11), and the surface of the outer box body (1) is fixedly installed with a liquid discharge component (13).

2. The landfill leachate pretreatment device according to claim 1, characterized in that: The suction mechanism (4) comprises a storage box (401), the storage box (401) is slidably mounted on the top surface of the box cover (3), a fan (402) is fixedly mounted on the top wall of the storage box (401), a filter (403) is fixedly mounted on the top surface of the inner wall of the storage box (401), a suction pipe (404) is fixedly inserted on the bottom surface of the storage box (401), the bottom end of the suction pipe (404) is fixedly inserted on the top wall of the dirt storage box (5), a sealing door (405) is hinged on the front of the storage box (401), and buckles (406) for fixing the sealing door (405) are provided on the surface of the sealing door (405) and the storage box (401).

3. The landfill leachate pretreatment device according to claim 1, characterized in that: The brushing mechanism (6) comprises a motor box (601), the motor box (601) being fixedly mounted on the side of the dirt storage box (5), a first motor (602) being fixedly mounted inside the motor box (601), a rotating shaft (603) being fixedly connected to the output end of the first motor (602), the rotating shaft (603) being rotatably mounted between the left and right side walls of the dirt storage box (5), a rolling brush (604) for brushing the bottom wall of the filter box (2) being fixedly mounted on the surface of the rotating shaft (603), and the upper end of the scraper (7) being arranged in contact with the side of the rolling brush (604).

4. The landfill leachate pretreatment device according to claim 2, characterized in that: The moving mechanism (8) comprises a slide groove (801), a through groove (802) and a second motor (803); the slide groove (801) and the through groove (802) are both provided on the top surface of the box cover (3); the suction pipe (404) is slidably arranged relative to the inner wall surface of the through groove (802); the number of the slide grooves (801) is two; the second motor (803) is fixedly installed on the outer surface of the outer box body (1); a threaded rod (804) is fixedly connected to the output end of the second motor (803); the threaded rod (804) is rotatably arranged relative to the front and rear side surfaces of the inner wall of one side of the slide groove (801) and the side wall of the outer box body (1); a slider (805) is slidably installed on the inner wall surface of the slide groove (801); the storage box (401) is fixedly installed on the top surface of the slider (805); the surface of the threaded rod (804) is threadedly connected to the slider (805).

5. The landfill leachate pretreatment device according to claim 1, characterized in that: The water level sensing component (9) comprises a mounting tube (901) and a pressure sensor (902); the mounting tube (901) is fixedly mounted on the bottom surface of the box cover (3); the pressure sensor (902) is fixedly mounted on the bottom surface of the mounting tube (901); the drainage component (13) comprises a drainage tube (131); the drainage tube (131) is fixedly inserted into the side wall of the outer box body (1); and a drainage pump (132) is provided on the surface of the drainage tube (131).

6. The landfill leachate pretreatment device according to claim 1, characterized in that: The static box (12) comprises a bucket-shaped box body (121), a silt extraction pipe (122) and a silt extraction pump (123); the bucket-shaped box body (121) is fixedly mounted on the inner wall surface of the outer box body (1) and is arranged directly below the filter box (2); the silt extraction pipe (122) penetrates the side wall of the outer box body (1) and the side wall of the bucket-shaped box body (121); one end of the silt extraction pipe (122) located inside the bucket-shaped box body (121) is arranged close to the bottom of the bucket-shaped box body (121); and the silt extraction pump (123) is arranged on the surface of the silt extraction pipe (122).

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