Microfiltration device

Abstract

The utility model discloses a kind of microfiltration equipment, framework has multiple installation plate arranged along front-back direction, multiple groups of installation structure are one-to-one corresponding with each installation plate, each group of installation structure includes pressing plate and adjusting structure, pressing plate is arranged with corresponding installation plate with interval and forms extrusion groove, adjusting structure is arranged between pressing plate and corresponding installation plate and can adjust the thickness of extrusion groove;Among them, at least one filter screen is installed between each two adjacent installation plates, in the circumferential direction of sewage cavity, the opposite two sides of filter screen are inserted in the extrusion groove of corresponding two adjacent installation plates, in installation structure, pressing plate can simultaneously press in the two adjacent filter screens in extrusion groove. Thus, the connection between filter screen and framework is realized by installation structure, simple structure, also makes the installation and disassembly operation of filter screen more simple and convenient.

Description

Technical Field

[0001] This utility model relates to the field of filtration equipment technology, and in particular to a microfiltration device. Background Technology

[0002] In aquaculture, microfiltration equipment is usually needed to remove impurities such as algae and sludge from the water. Microfiltration equipment generally includes a cylindrical frame and a filter structure installed on the outer periphery of the frame. When in use, the wastewater from aquaculture is passed into the frame, and the frame is driven to rotate by a drive mechanism. The water inside the frame can flow out through the filter screen, while the impurities in the water can accumulate inside the frame due to the blocking effect of the filter screen.

[0003] To improve the pressure resistance of microfiltration equipment, the filtration structure usually includes multiple metal filter screens, all of which are installed on the outer periphery of the frame. However, the installation structure between the metal filter screen and the frame is usually extremely complex, and the filter screen cannot be installed on the frame very flat. The maintenance and replacement of the filter screen is also very difficult, resulting in time-consuming, labor-intensive, and inefficient installation and disassembly of the filter screen. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a microfiltration device with a simple connection structure between the filter screen and the frame, facilitating the installation and disassembly of the filter screen.

[0005] A microfiltration device according to an embodiment of the present invention includes: a housing arranged in a front-to-back direction, the housing having a mounting cavity and an outlet communicating with the mounting cavity; a frame rotatably mounted within the mounting cavity, dividing the mounting cavity into a wastewater cavity and a filtration cavity, the wastewater cavity being located within the frame, the frame having an inlet communicating with the wastewater cavity, the filtration cavity being arranged around the outer periphery of the frame and communicating with the outlet, the rotation axis of the frame being arranged in a front-to-back direction, and the frame having multiple mounting plates arranged in a front-to-back direction, all the mounting plates being arranged sequentially and at intervals around the outer periphery of the wastewater cavity, and multiple sets of mounting structures, each mounting plate... Each set of mounting structures includes a pressure plate and an adjustment structure. The pressure plate is arranged along the front-to-back direction and located outside the corresponding mounting plate. The pressure plate and the corresponding mounting plate are spaced apart to form a squeezing groove. The adjustment structure is located between the pressure plate and the corresponding mounting plate and can adjust the thickness of the squeezing groove. At least one filter screen is installed between each pair of adjacent mounting plates. In the circumferential direction of the sewage chamber, the opposite sides of the filter screen are inserted into the squeezing grooves of the corresponding two adjacent mounting plates. In the mounting structure, the pressure plate can simultaneously press against the two adjacent filter screens in the squeezing groove.

[0006] The microfiltration device according to the embodiments of this utility model has at least the following beneficial effects:

[0007] By employing the microfiltration device of this embodiment, during installation, the filter screen is simply inserted into the corresponding compression grooves of two adjacent mounting plates. The thickness of the compression grooves between the pressure plate and the mounting plates is then adjusted using an adjustment structure, causing the pressure plate to press against the filter screen. This confines the opposite sides of the filter screen within the corresponding compression grooves of the two adjacent mounting plates, thus achieving filter screen installation. Furthermore, the pressure plate's fixing of the filter screen improves the flatness of the installation and makes it more secure and stable. When the filter screen needs to be replaced or removed, simply loosen the pressure plate's contact with the filter screen using the adjustment structure to release the filter screen, allowing for easy removal for replacement or repair. Therefore, the microfiltration device of this embodiment achieves the connection between the filter screen and the frame through an installation structure, resulting in a simple structure and making filter screen installation and removal simpler and more convenient.

[0008] According to some embodiments of the present invention, in each set of the mounting structures, the adjustment structure includes a plurality of fasteners, all of which are arranged sequentially at intervals along the front-back direction. Each fastener is sequentially threaded onto the pressure plate and the corresponding mounting plate and is capable of adjusting the thickness of the extrusion groove.

[0009] According to some embodiments of the present invention, in the installation structure, a support member corresponding to each fastener is provided between the pressure plate and the corresponding mounting plate. The support member can support the pressure plate and arrange the pressure plate and the mounting plate at intervals to form the extrusion groove. The fastener is sequentially inserted through the pressure plate, the support member and the corresponding mounting plate.

[0010] According to some embodiments of the present invention, the filter screen is provided with slots corresponding to the fasteners on both opposite sides. When the side of the filter screen is inserted into the corresponding compression groove, the fastener can be embedded in the corresponding slot.

[0011] According to some embodiments of the present invention, at least two filter screens are installed between each pair of adjacent mounting plates. Between each pair of adjacent mounting plates, all the filter screens are arranged sequentially in the front-back direction, and the adjacent filter screens are interlocked or abutted against each other.

[0012] According to some embodiments of the present invention, in the installation structure, the pressure plate includes two interconnected side plates. The two side plates are arranged side by side along the circumference of the sewage chamber and form a "V" shape with the opening facing the corresponding installation plate. The two side plates can press against two adjacent filter screens in the extrusion groove.

[0013] According to some embodiments of the present invention, the skeleton further includes a plurality of annular frames, which are arranged around the outer periphery of the sewage chamber and interconnected with all the mounting plates, and all the annular frames are arranged sequentially at intervals along the front-back direction.

[0014] According to some embodiments of the present invention, the housing is provided with at least one set of roller assemblies, the roller assembly including at least two rollers rotatably mounted on the housing, and in the roller assembly, all the rollers are arranged around the outer periphery of one of the annular frames and roll against the corresponding annular frame.

[0015] According to some embodiments of the present invention, at least one reinforcing plate is provided between each pair of adjacent mounting plates, and the reinforcing plate is arranged along the front-back direction and connected to all the ring frames.

[0016] According to some embodiments of the present invention, the housing is provided with a flushing device located above the frame, the nozzle of the flushing device is arranged facing the frame, the sewage chamber is provided with a sludge collection tank with its opening facing upward, the sludge collection tank is installed on the frame and located below the flushing device, the front end or rear end of the frame is provided with a sewage discharge pipe connected to the sludge collection tank, and the bottom wall of the sludge collection tank is arranged to slope downward along the direction close to the sewage discharge pipe.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of a microfiltration device according to an embodiment of the present invention;

[0020] Figure 2 This is a partial structural schematic diagram of the microfiltration device according to an embodiment of the present utility model;

[0021] Figure 3 for Figure 2 Enlarged view of a portion of point A in the middle;

[0022] Figure 4 This is a cross-sectional schematic diagram of the installation structure according to an embodiment of the present utility model;

[0023] Figure 5 This is a schematic diagram of the pressure plate in an embodiment of the present utility model;

[0024] Figure 6 This is a schematic diagram of the sludge collection tank according to an embodiment of the present utility model.

[0025] Figure label:

[0026] 100 housing, 110 filter chamber, 120 rollers, 130 sludge collection tank, 140 drain pipe;

[0027] Frame 200, sewage chamber 210, inlet 211, mounting plate 220, pressure plate 230, side plate 231, adjustment structure 240, extrusion groove 250, support component 260, ring frame 270, reinforcing plate 280. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0031] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0032] Reference Figures 1 to 4This utility model provides a microfiltration device, which includes a housing 100, a frame 200, and multiple mounting structures. The housing 100 is arranged in a front-to-back direction and has a mounting cavity and an outlet (not shown in the figure) connected to the mounting cavity. The frame 200 is rotatably mounted in the mounting cavity, dividing the mounting cavity into a wastewater cavity 210 and a filtration cavity 110. The wastewater cavity 210 is located inside the frame 200, and the frame 200 has an inlet 211 connected to the wastewater cavity 210. The filtration cavity 110 is arranged around the outer periphery of the frame 200 and connected to the outlet. The rotation axis of the frame 200 is arranged in a front-to-back direction, and the frame 200 has multiple mounting plates 220 arranged in a front-to-back direction. All mounting plates 220 are arranged sequentially and at intervals around the outer periphery of the wastewater cavity 210. Multiple sets of installation structures correspond one-to-one with each installation plate 220. Each set of installation structures includes a pressure plate 230 and an adjustment structure 240. The pressure plate 230 is arranged along the front-back direction and located on the outside of the corresponding installation plate 220. The pressure plate 230 and the corresponding installation plate 220 are arranged at intervals to form a squeezing groove 250. The adjustment structure 240 is located between the pressure plate 230 and the corresponding installation plate 220 and can adjust the thickness of the squeezing groove 250. At least one filter screen (not shown in the figure) is installed between each two adjacent installation plates 220. In the circumferential direction of the sewage chamber 210, the opposite sides of the filter screen are inserted into the squeezing groove 250 of the corresponding two adjacent installation plates 220. In the installation structure, the squeezing plate 230 can simultaneously press against the two adjacent filter screens in the squeezing groove 250.

[0033] By employing the microfiltration device of this embodiment, during installation, the filter screen is simply inserted into the corresponding compression grooves 250 of two adjacent mounting plates 220. The thickness of the compression grooves 250 between the pressure plate 230 and the mounting plate 220 is then adjusted using the adjustment structure 240, causing the pressure plate 230 to press against the filter screen. This confines the opposite sides of the filter screen within the corresponding compression grooves 250 of the two adjacent mounting plates 220, thus achieving filter screen installation. In this structure, the pressure plate 230 presses and fixes the sides of the filter screen, improving the flatness of the filter screen installation and making the installation more secure and stable. When the filter screen needs to be replaced or removed, the pressure plate 230 is loosened by adjusting the structure 240 to release the filter screen, allowing it to be easily removed for replacement or maintenance. Therefore, the microfiltration device of this embodiment achieves the connection between the filter screen and the frame 200 through the installation structure, resulting in a simple structure and making filter screen installation and removal operations simpler and more convenient.

[0034] Understandably, during the use of the aforementioned microfiltration equipment, wastewater from aquaculture is introduced into the wastewater chamber 210 through the inlet 211. The drive mechanism drives the frame 200 to rotate, which in turn drives the filter screen to rotate. Water in the wastewater can flow into the filtration chamber 110 through the filter screen and be discharged from the outlet. Impurities in the wastewater can remain in the wastewater chamber 210 due to the blocking effect of the filter screen, thereby achieving microfiltration of wastewater from aquaculture.

[0035] Understandably, the filter screen can be made of stainless steel mesh with a pore size range of 20-200 micrometers, which can achieve a good microfiltration effect.

[0036] It is understood that the frame 200 can be made of PP material, which has high strength, corrosion resistance, and deformation resistance. Of course, in addition, the frame can also be made of stainless steel or other materials, and this utility model does not make specific limitations in this regard.

[0037] Reference Figures 1 to 4 In some embodiments, in each set of mounting structures, the adjustment structure 240 includes multiple fasteners, all of which are arranged sequentially at intervals along the front-back direction. Each fastener is sequentially threaded onto the pressure plate 230 and the corresponding mounting plate 220 and can adjust the thickness of the compression groove 250. Thus, when installing and removing the filter screen, only the individual fasteners need to be adjusted. Furthermore, since the fasteners are sequentially threaded onto the pressure plate 230 and the corresponding mounting plate 220, the structure is not only simple but also makes the installation and fixation of the filter screen more secure and stable.

[0038] It is understood that in the above structure, the fasteners can specifically be threaded fasteners such as screws and bolts, and this utility model does not make any specific limitation in this regard.

[0039] It is understood that, in addition to the fasteners mentioned above, the adjustment structure 240 can also be a combination of a slide rail and a snap-fit ​​component in some embodiments. Specifically, a slide rail is provided on the mounting plate 220, and a snap-fit ​​component is provided on the slide rail to cooperate with the pressure plate 230. The pressure plate 230 can move along the slide rail closer to or further away from the corresponding mounting plate 220 and cooperate with the snap-fit ​​component, thereby fixing the pressure plate 230 in a suitable position to press and fix the filter screen. Of course, the adjustment structure 240 can also adopt other structures, and this utility model does not specifically limit its application in this regard.

[0040] Reference Figure 4In some embodiments, in the mounting structure, a support member 260 corresponding to a fastener is provided between the pressure plate 230 and the corresponding mounting plate 220. The support member 260 can support the pressure plate 230 and arrange the pressure plate 230 and the mounting plate 220 at intervals to form an extrusion groove 250. The fasteners are sequentially inserted through the pressure plate 230, the support member 260 and the corresponding mounting plate 220. The support member 260 can position and install the pressure plate 230 and the mounting plate 220, and define the space of the extrusion groove 250 between the pressure plate 230 and the mounting plate 220. The support member 260 can be fixedly installed on the mounting plate 220 by welding or integral molding.

[0041] Reference Figures 1 to 4 In some embodiments, the filter screen has slots corresponding to fasteners on both sides. When the side of the filter screen is inserted into the corresponding compression groove 250, the fastener can be embedded in the corresponding slot, thereby making the fit between the filter screen and the installation structure tighter. The filter screen can be embedded more into the compression groove 250, increasing the pressure area of ​​the pressure plate 230 on the filter screen, making the installation structure between the filter screen and the frame 200 more compact and stable.

[0042] Understandably, in the circumferential direction of the sewage chamber 210, the two sides of each pair of adjacent filter screens are inserted into the same extrusion groove 250 and abut against each other, which makes the installation between the filter screens more compact, and thus makes the installation between the frame 200 and all the filter screens more stable, facilitating the microfiltration operation of sewage.

[0043] In some embodiments, at least two filter screens are installed between every two adjacent mounting plates 220. All filter screens are arranged sequentially along the front-to-back direction between every two adjacent mounting plates 220, and adjacent filter screens are interlocked or abutted against each other. This microfiltration of wastewater is achieved by splicing multiple filter screens. This structure makes the installation and removal of the filter screens more convenient and quick, and when a certain position is damaged, only the filter screen at the corresponding position needs to be replaced, thus facilitating the maintenance of the filtration structure in the microfiltration equipment.

[0044] Reference Figures 1 to 5In some embodiments, in the installation structure, the pressure plate 230 includes two interconnected side plates 231. The two side plates 231 are arranged side by side along the circumference of the sewage chamber 210 and form a "V" shape with the opening facing the corresponding mounting plate 220. The two side plates 231 can press against two adjacent filter screens in the extrusion groove 250. Thus, the two side plates 231 of the pressure plate 230 are arranged inclined from top to bottom towards both sides of the mounting plate 220, so that the two side plates 231 can press against the filter screens on both sides of the mounting plate 220 respectively, and the side of the two side plates 231 closer to the mounting plate 220 can stably press against the filter screen. This structure can increase the extrusion strength of the pressure plate 230 on the filter screen, making the installation of the filter screen more firm and stable.

[0045] Reference Figures 1 to 3 In some embodiments, the skeleton 200 further includes a plurality of annular frames 270, which are arranged around the outer periphery of the sewage chamber 210 and connected to all the mounting plates 220. All the annular frames 270 are arranged sequentially at intervals in the front-back direction, thereby improving the structural strength and structural stability of the skeleton 200 and avoiding damage to the skeleton 200 during the sewage microfiltration process.

[0046] It is understood that the ring frame 270 and the mounting plate 220 can be connected by welding or other methods, and this utility model does not specifically limit this.

[0047] Reference Figure 2 In some embodiments, the housing 100 is provided with at least one set of roller 120 assemblies. The roller 120 assembly includes at least two rollers 120 rotatably mounted on the housing 100. In the roller 120 assembly, all rollers 120 are arranged around the outer periphery of one of the annular frames 270 and roll against the corresponding annular frame 270. Thus, the rollers 120 can support and guide the rotation of the frame 200, making the rotation of the frame 200 more stable and smooth.

[0048] Reference Figure 1 and Figure 2 At least one reinforcing plate 280 is provided between every two adjacent mounting plates 220. The reinforcing plates 280 are arranged in the front-to-back direction and connected to all the ring frames 270. This makes the structure of the frame 200 more stable. At the same time, the reinforcing plates 280 can cooperate with the mounting plates 220 to support the filter screen, making the installation of the filter screen more stable and preventing the filter screen from deforming due to water flow impact during use.

[0049] Reference Figure 1 , Figure 2 and Figure 6In some embodiments, the housing 100 is provided with a flushing device located above the frame 200, the nozzle of the flushing device is arranged facing the frame 200, the sewage chamber 210 is provided with a sludge collection tank 130 with the opening facing upward, the sludge collection tank 130 is installed on the frame 200 and located below the flushing device, the front end or rear end of the frame 200 is provided with a drain pipe 140 connected to the sludge collection tank 130, and the bottom wall of the sludge collection tank 130 is arranged to slope downward along the direction close to the drain pipe 140. Therefore, when the filter screen rotates to the rinsing device, the high-pressure water jet from the rinsing device can clean the filter screen, washing away impurities attached to the inner surface of the filter screen. Since a sludge collection tank 130 is provided below the rinsing device, the impurities on the inner surface of the filter screen can fall into the sludge collection tank 130 under the rinsing action of the rinsing device. Since the bottom wall of the sludge collection tank 130 is arranged downward along the direction close to the drain pipe 140, it can guide the impurities to be discharged from the drain pipe 140, which is conducive to the cleaning of impurities in the microfiltration equipment and avoids the filter screen from becoming clogged due to impurities adhering to it during the microfiltration process, thus affecting the microfiltration of wastewater in aquaculture.

[0050] Understandably, the flushing device can be equipped with a high-pressure water pump to spray and flush impurities on the inner surface of the filter screen in a directional manner, thereby facilitating the efficient removal of suspended impurities from wastewater.

[0051] In some embodiments, the drive device for driving the frame 200 to rotate can specifically employ a PLC and a frequency converter for coordinated control, thereby achieving a soft start and stop function, eliminating start-up jerks, and reducing mechanical shock and energy consumption.

[0052] In some embodiments, the microfiltration device is also equipped with a float switch for monitoring the liquid level, thereby enabling real-time monitoring of the water level and triggering the float switch at a fixed point to ensure stable operation of the device within a set liquid level range.

[0053] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A microfiltration device, characterized in that, include: A housing (100) is arranged in the front-to-back direction, the housing (100) having a mounting cavity and a water outlet communicating with the mounting cavity; A frame (200) is rotatably mounted within the mounting cavity, dividing the mounting cavity into a sewage chamber (210) and a filter chamber (110). The sewage chamber (210) is located within the frame (200). The frame (200) has an inlet (211) communicating with the sewage chamber (210). The filter chamber (110) is arranged around the outer periphery of the frame (200) and communicates with the outlet. The rotation axis of the frame (200) is arranged in the front-back direction, and the frame (200) has multiple mounting plates (220) arranged in the front-back direction. All the mounting plates (220) are arranged sequentially and at intervals around the outer periphery of the sewage chamber (210). Multiple sets of mounting structures correspond one-to-one with each of the mounting plates (220). Each set of mounting structures includes a pressure plate (230) and an adjustment structure (240). The pressure plate (230) is arranged in the front-back direction and located on the outside of the corresponding mounting plate (220). The pressure plate (230) and the corresponding mounting plate (220) are arranged at intervals to form an extrusion groove (250). The adjustment structure (240) is located between the pressure plate (230) and the corresponding mounting plate (220) and can adjust the thickness of the extrusion groove (250). In this installation structure, at least one filter screen is installed between each pair of adjacent mounting plates (220). In the circumferential direction of the sewage chamber (210), the two opposite sides of the filter screen are inserted into the squeezing grooves (250) of the corresponding two adjacent mounting plates (220). In this installation structure, the pressure plate (230) can simultaneously press against the two adjacent filter screens in the squeezing grooves (250).

2. The microfiltration device according to claim 1, characterized in that, In each set of the mounting structures, the adjustment structure (240) includes a plurality of fasteners, all of which are arranged sequentially at intervals in the front-back direction. Each fastener is sequentially threaded onto the pressure plate (230) and the corresponding mounting plate (220) and is capable of adjusting the thickness of the extrusion groove (250).

3. The microfiltration device according to claim 2, characterized in that, In the installation structure, a support member (260) corresponding to each fastener is provided between the pressure plate (230) and the corresponding mounting plate (220). The support member (260) can support the pressure plate (230) and arrange the pressure plate (230) and the mounting plate (220) at intervals to form the extrusion groove (250). The fastener is sequentially inserted through the pressure plate (230), the support member (260) and the corresponding mounting plate (220).

4. The microfiltration device according to claim 2, characterized in that, The filter screen has slots on both sides corresponding to the fasteners. When the side of the filter screen is inserted into the corresponding compression groove (250), the fastener can be embedded in the corresponding slot.

5. The microfiltration device according to claim 1, characterized in that, At least two filters are installed between each pair of adjacent mounting plates (220). Between each pair of adjacent mounting plates (220), all filters are arranged sequentially in the front-to-back direction, and adjacent filters are engaged or abutted against each other.

6. The microfiltration device according to claim 1, characterized in that, In the installation structure, the pressure plate (230) includes two interconnected side plates (231). The two side plates (231) are arranged side by side along the circumference of the sewage chamber (210) and have an "V" shape with the opening facing the corresponding installation plate (220). The two side plates (231) can press against the two adjacent filter screens in the extrusion groove (250).

7. The microfiltration device according to claim 1, characterized in that, The frame (200) also includes a plurality of ring frames (270), which are arranged around the outer periphery of the sewage chamber (210) and interconnected with all the mounting plates (220). All the ring frames (270) are arranged sequentially at intervals in the front-back direction.

8. The microfiltration device according to claim 7, characterized in that, The housing (100) is provided with at least one set of roller (120) assemblies, the roller (120) assembly including at least two rollers (120) rotatably mounted on the housing (100), in the roller (120) assembly, all the rollers (120) are arranged around the outer periphery of one of the annular frames (270) and roll against the corresponding annular frame (270).

9. The microfiltration device according to claim 7, characterized in that, At least one reinforcing plate (280) is provided between each two adjacent mounting plates (220), the reinforcing plate (280) being arranged in the front-back direction and connected to all the ring frames (270).

10. The microfiltration device according to claim 1, characterized in that, The housing (100) is provided with a flushing device located above the frame (200), the nozzle of the flushing device is arranged facing the frame (200), the sewage chamber (210) is provided with a sludge collection tank (130) with its opening facing upward, the sludge collection tank (130) is installed on the frame (200) and located below the flushing device, the front end or rear end of the frame (200) is provided with a drain pipe (140) connected to the sludge collection tank (130), and the bottom wall of the sludge collection tank (130) is arranged to slope downward along the direction close to the drain pipe (140).

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