River channel dredging and transferring device

Abstract

The utility model relates to the technical field of river channel desilting equipment, and discloses a river channel desilting transfer device which comprises a desilting transfer box and a silt inlet formed in one side of the top end of the desilting transfer box, an extrusion mechanism is connected to the side wall of the desilting transfer box in a sliding mode, and the extrusion mechanism is in sliding fit with the desilting transfer box to extrude silt in the desilting transfer box. Before sludge is extruded, the extrusion mechanism is located below the sludge inlet; a filtering mechanism is arranged on the side, right opposite to the extrusion mechanism, of the dredging transfer box, and a drainage mechanism is connected to the filtering mechanism. A silt discharging mechanism is slidably connected into the desilting transfer box, and the sliding direction of the silt discharging mechanism is perpendicular to the sliding direction of the extrusion mechanism. The river channel dredging device solves the problems that in the prior art, the dredging efficiency is affected and the dredging cost is high due to the fact that the water content in sludge is large during river channel dredging.

Description

Technical Field

[0001] The utility model relates to the technical field of river channel desilting equipment, in particular to a river channel desilting and transferring device. Background Art

[0002] Currently, when desilting a river, mechanical equipment is required to salvage the silt accumulated at the bottom of the river, and then the salvaged silt is transported away using transportation equipment to clear the river. Since the silt just salvaged from the river contains a large amount of water, it will increase its weight and viscosity, making it inconvenient and inefficient to transport the silt. To alleviate this problem, the existing technology usually requires dehydrating the newly salvaged silt to reduce the water content in the silt, thereby making silt transportation more convenient and effectively reducing transportation energy consumption.

[0003] For example, the utility model patent with publication number CN217247122U discloses a river channel desilting device. The device comprises a desilting box, a filter plate, a pressure plate, and a telescopic component. During use, water-containing sludge is poured into the desilting box. The telescopic component then drives the pressure plate to squeeze the sludge. The pressure on the pressure plate causes the internal moisture to be squeezed out of the filter plate. Another example is the utility model patent with publication number CN213924452U, which discloses a mud-water separation device for river channel desilting. The device comprises a sludge pressure plate, a filter bag, and a telescopic cylinder. During use, the telescopic cylinder pushes the sludge pressure plate to squeeze the sludge, thereby squeezing the moisture out of the filter bag and achieving dehydration. Although the dehydration structure in the prior art can achieve sludge dehydration, in actual use, the device structure is relatively complex, and the addition of water-containing sludge and the removal of dehydrated sludge are inconvenient, which affects the efficiency of sludge dehydration. Utility Model Content

[0004] The utility model aims to provide a river channel silt removal and transfer device to solve the problem in the prior art that the water content in the silt during the river channel silt removal process is relatively high, which affects the silt removal efficiency and increases the silt removal cost.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions: a river dredging and transfer device, comprising a dredging transfer box and a silt inlet arranged on one side of the top of the dredging transfer box, a squeezing mechanism is slidably connected to the side wall of the dredging transfer box, the squeezing mechanism and the dredging transfer box slide together to squeeze the silt inside the dredging transfer box, before squeezing the silt, the squeezing mechanism is located below the silt inlet; a filtering mechanism is provided on the side of the dredging transfer box opposite to the squeezing mechanism, and a drainage mechanism is connected to the filtering mechanism; a silt discharge mechanism is slidably connected inside the silt discharge transfer box, and the sliding direction of the silt discharge mechanism is perpendicular to the sliding direction of the squeezing mechanism.

[0006] The principle and beneficial effects of this solution are as follows: in this application, the silt inlet is set at one side of the top of the silt removal transfer box, which can conveniently pour the salvaged sludge into the silt removal box. After the water-containing sludge is poured into the silt removal transfer box, the squeezing mechanism is located below the silt inlet, driving the squeezing mechanism to slide in the direction of the filtering mechanism to squeeze the silt in the silt removal transfer box, so that the water in the silt is separated from the silt and squeezed out of the filtering mechanism, and then discharged by the drainage mechanism. After the water in the silt is squeezed out, the squeezing mechanism resets, and the silt removal mechanism slides at this time. Since the sliding direction of the silt removal mechanism is perpendicular to the sliding direction of the squeezing mechanism, and the squeezing mechanism is reset and is located outside the sliding path of the silt removal mechanism, the silt removal mechanism can conveniently push the dehydrated silt out of the silt removal transfer box, and the whole process is very efficient.

[0007] In the present application, water-containing sludge is added into the dredging transfer box from top to bottom. The direction in which the extrusion mechanism extrudes the sludge is perpendicular to the direction in which the dredging mechanism discharges the sludge. The working processes of the extrusion mechanism and the dredging mechanism do not affect each other. The overall structure is simple and can conveniently and efficiently complete the sludge dehydration operation, thereby effectively reducing the cost of the dredging process.

[0008] Preferably, as an improvement, the extrusion mechanism includes an extrusion driver and an extrusion plate fixedly connected to the extrusion driver, the extrusion driver is fixedly connected to the dredging transfer box, and the extrusion plate is slidably connected to the inside of the dredging transfer box.

[0009] In this solution, the extrusion plate is driven to slide by pushing and pulling the extrusion driver, so that the extrusion plate can squeeze and dehydrate the silt in the dredging transfer box. The structure is simple and the extrusion process is stable.

[0010] Preferably, as an improvement, the silt discharge mechanism includes a silt discharge driver, a silt discharge push plate and a sealing baffle, the silt discharge driver is fixedly connected to the silt removal transfer box, the silt discharge push plate is fixedly connected to the silt discharge driver, and an intermediate connecting piece is fixedly connected between the silt discharge push plate and the sealing push plate; silt discharge push grooves and sealing through grooves are provided on the two side surfaces facing each other on the silt discharge push plate silt removal transfer box, and when the extrusion mechanism squeezes the silt in the silt removal transfer box, the silt discharge push plate is located in the silt discharge push groove, and the sealing push plate is located in the sealing through groove.

[0011] In this solution, silt discharge pushing grooves and sealing grooves are provided on the two sides facing each other on the silt discharge pushing plate silt removal transfer box. When the squeezing mechanism squeezes the silt in the silt removal transfer box, the silt discharge pushing plate is located in the silt discharge pushing groove, and the sealing baffle is located in the sealing groove, so as to prevent the silt and water from being squeezed out of the silt removal transfer box through the silt discharge pushing groove and the sealing groove when the squeezing mechanism squeezes the water-containing silt, thereby ensuring the stability of silt dehydration; when the silt dehydration is completed and the squeezing mechanism is reset, the silt discharge driver pushes the silt discharge pushing plate to slide, and the silt discharge pushing plate is connected in the middle Under the pushing action of the middle connection of the parts, the sealing baffle also moves synchronously with the silt discharge push plate, so that the sealing baffle moves from the sealing groove to the outside of the silt removal transfer box, and the dehydrated sludge in the silt removal transfer box is pushed out of the silt removal transfer box. The silt pushed out by the silt discharge push plate falls downward under its own gravity or other external forces, and then the fallen dehydrated silt can be transferred to the transfer equipment in the existing technology for centralized treatment. Finally, the silt discharge driver drives the silt discharge push plate to reset, and the next silt dehydration can be carried out.

[0012] Preferably, as an improvement, a T-shaped guide groove is provided on the side of the extrusion plate, and a guide plate that slides with the T-shaped guide groove is fixedly connected to the silt removal push plate and / or the sealing baffle.

[0013] In this solution, when the extrusion plate squeezes the sludge under the action of the extrusion driver, the guide plate is inserted into the T-shaped guide groove. Therefore, when the extrusion plate applies pressure to the water-containing sludge, the limiting effect of the guide plate and the T-shaped guide groove is relied upon to reduce the gap between the silt discharge push plate and / or the sealing baffle and the dredging transfer box due to the silt pressure, thereby avoiding silt leakage during the silt extrusion process and improving the stability of silt dehydration.

[0014] Preferably, as an improvement, the filtering mechanism includes a filter steel mesh, which is vertically fixedly connected to the dredging transfer box and arranged opposite the extrusion mechanism, and a filtering gap is provided between the side of the filter steel mesh away from the extrusion mechanism and the inner wall of the dredging transfer box, and the drainage mechanism is connected to the filtering gap.

[0015] In this solution, when the squeezing plate slides toward the filter steel mesh and squeezes the sludge, the water can be squeezed into the filter gap on one side of the filter steel mesh, thereby conveniently achieving the sludge dehydration operation.

[0016] Preferably, as an improvement, the drainage mechanism includes a drainage pipe, the water inlet end of the drainage pipe is connected to the bottom end of the filter gap, and the water outlet end of the drainage pipe extends outside the dredging transfer box.

[0017] In this solution, the water inlet end of the drain pipe is connected to the bottom end of the filter gap, so that the water generated by sludge dehydration can be smoothly discharged by the drain pipe after entering the filter gap, preventing a large amount of water from accumulating in the filter gap and affecting the sludge dehydration cycle.

[0018] Preferably, as an improvement, the silt removal push plate is connected to a cleaning mechanism for cleaning the filter steel mesh.

[0019] In this solution, a cleaning brush mechanism is set on the silt discharge push plate. Every time the silt discharge push plate pushes the dehydrated sludge out of the silt discharge transfer box, the cleaning brush mechanism can clean the filter steel mesh when passing back and forth through the filter steel mesh, reducing the situation where the filter holes of the filter steel mesh are blocked by sludge, and effectively ensuring the dehydration effect and dehydration efficiency of the filter steel mesh.

[0020] Preferably, as an improvement, the cleaning mechanism includes a brush fixedly connected to the silt removal push plate.

[0021] In this solution, the cleaning mechanism is a brush, which has a simple structure and can have a good cleaning effect on the filter steel mesh.

[0022] Preferably, as an improvement, a vertically arranged mounting groove is provided on one end of the silt removal push plate facing the filter steel mesh, and the brush is fixedly connected in the mounting groove.

[0023] In this solution, the brush is fixedly installed in a vertically arranged installation groove. When the silt removal push plate moves relative to the filter steel mesh, the brush can clean the filter steel mesh to the maximum extent. When the silt removal push plate is reset to the silt removal push groove, the brush can be prevented from continuing to be in the silt removal transfer box, which not only protects the brush, but also prevents the brush from interfering with sludge dehydration.

[0024] Preferably, as an improvement, the filtering mechanism further comprises an auxiliary filter screen fixedly connected to the dredging transfer box, and the auxiliary filter screen is located between the water inlet end of the drain pipe and the filter gap.

[0025] In this solution, an auxiliary filter is used to further filter the water entering the drain pipe to reduce the risk of the drain pipe being blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a front cross-sectional view of the first embodiment of the present invention.

[0027] Figure 2 for Figure 1 Cross-sectional view along AA.

[0028] Figure 3 for Figure 2 Schematic diagram of the state where the middle silt discharge push plate and the sealing baffle are pushed to discharge silt.

[0029] Figure 4 This is a cross-sectional view of the guide plate provided in the second embodiment of the present invention.

[0030] Figure 5 This is a schematic diagram of a brush provided on a silt removal push plate in the third embodiment of the present invention.

[0031] Figure 6 It is a front cross-sectional view of the fourth embodiment of the present utility model. DETAILED DESCRIPTION

[0032] The following is further described in detail through specific implementation methods:

[0033] The figure marks in the drawings of the specification include: dredging transfer box 1, silt inlet 101, silt discharge push groove 102, sealing groove 103, silt inlet hopper 2, extrusion driver 3, extrusion plate 4, filter steel mesh 5, filter gap 6, drain pipe 7, silt discharge driver 8, silt discharge push plate 9, installation groove 901, sealing baffle 10, connecting push rod 11, guide plate 12, brush 13, auxiliary filter screen 14.

[0034] Example 1

[0035] This embodiment is as shown in the attached Figure 1 As shown: A river dredging and transfer device includes a dredging transfer box 1 and a silt inlet 101 arranged on the left side of the top of the dredging transfer box 1. The dredging transfer box 1 is hollow inside, and water-containing silt can be poured into the dredging transfer box 1 through the silt inlet 101. In order to facilitate the pouring of silt into the dredging transfer box 1, a funnel-shaped silt inlet 2 is welded on the silt inlet 101 in this embodiment.

[0036] Combine Figure 1 and Figure 2 A squeezing mechanism is laterally slidably connected to the left side wall of the dredging transfer box 1. This mechanism cooperates with the hollow structure within the dredging transfer box 1 to squeeze the water-containing sludge within the dredging transfer box 1. Specifically, the squeezing mechanism in this embodiment includes a squeezing driver 3 and a squeezing plate 4 fixedly connected to the squeezing driver 3. The squeezing driver 3 can be a pneumatic cylinder or an electric cylinder. The squeezing driver 3 is fixedly connected to the left outer wall of the dredging transfer box 1. The squeezing plate 4 slidably cooperates with the inner wall of the dredging transfer box 1. The power of the squeezing driver 3 pushes and pulls the squeezing plate 4 to slide laterally.

[0037] like Figure 1 As shown, a filter mechanism is provided on the right side of the dredging transfer box 1, facing the extrusion mechanism. A drainage mechanism is connected to the filter mechanism. Specifically, the filter mechanism includes a filter mesh 5 vertically welded to the inside of the dredging transfer box 1, forming a filter gap 6 between the filter mesh 5 and the right inner wall of the dredging transfer box 1. The drainage mechanism includes a drain pipe 7, the water inlet of which is connected to the bottom of the filter gap 6, and the water outlet of which extends outside the dredging transfer box 1. During actual installation, the left side of the silt inlet 101 of the dredging transfer box 1 can be set away from the river channel, while the side with the drain pipe 7 can be set close to the river channel, so that water discharged from the drain pipe 7 can flow directly back into the river channel.

[0038] Combine Figure 1 and Figure 2 A silt removal mechanism is also horizontally slidably connected to the desilting transfer box 1, and the sliding direction of the silt removal mechanism is perpendicular to the sliding direction of the extrusion mechanism. The silt removal mechanism includes a silt removal driver 8, a silt removal push plate 9, and a sealing baffle 10. The silt removal driver 8 can also be a pneumatic cylinder or an electric cylinder. The silt removal push plate 9 is fixedly connected to the silt removal driver 8 by screws, and an intermediate connecting member is fixedly connected between the silt removal push plate 9 and the sealing push plate. In this embodiment, the intermediate connecting member is a connecting push rod 11, and the ends of the connecting push rod 11 are respectively welded to the silt removal push plate 9 and the sealing baffle 10. At the same time, sliding grooves are opened on the top and bottom walls of the desilting transfer box 1. The connecting push rod 11 is slidably connected to the sliding grooves. The depth of the sliding grooves is equal to the thickness of the connecting push rod 11, thereby preventing the connecting push rod 11 from obstructing or interfering with the extrusion of the water-containing silt by the extrusion plate 4. At the same time, in order to facilitate the downward discharge of sludge between the silt removal push plate 9 and the sealing baffle 10, in this embodiment, three connecting push rods 11 are set on the top wall inside the silt removal transfer box 1, and two connecting push rods 11 are set on the bottom wall of the inner wall of the silt removal transfer box 1, and the two connecting push rods 11 at the bottom are located at the left and right ends of the bottom inside the silt removal transfer box 1.

[0039] In addition, combined Figure 2 and Figure 3 In this embodiment, a silt discharge pushing groove 102 and a sealing through groove 103 are opened on the front side wall and the rear side wall of the silt discharge transfer box 1. The silt discharge pushing plate 9 cooperates with the silt discharge pushing groove 102, and the sealing baffle 10 cooperates with the sealing through groove 103. When the squeezing plate 4 slides horizontally to squeeze the water-containing silt in the silt discharge transfer box 1, the silt discharge pushing plate 9 is located in the silt discharge pushing groove 102, and the sealing push plate is located in the sealing through groove 103. At this time, the front side and the rear side of the silt discharge transfer box 1 are in a sealed closed state, so that when the squeezing plate 4 squeezes the water-containing silt, the silt is prevented from being squeezed out of the silt discharge pushing groove 102 or the sealing through groove 103. Specific implementation method:

[0041] In this embodiment, in the initial state, the squeezing plate 4 is located at the left side of the silt removal transfer box 1, the silt removal push plate 9 is located in the silt removal push groove 102, and the sealing baffle 10 is located in the sealing through groove 103. Then, the water-containing silt in the river channel is excavated and poured into the silt inlet hopper 2. The water-containing silt falls from the silt inlet hopper 2 into the silt removal transfer box 1, completing the pouring of the water-containing silt. Then, the squeezing driver 3 is started, and the squeezing plate 4 is pushed along the silt removal transfer box 1 by the squeezing driver 3. Figure 1 After sliding to the right and passing under the silt inlet hopper 2, the squeezing plate 4 can squeeze the water-containing sludge in the silt removal transfer box 1, so that the water in the water-containing sludge passes through the filter steel mesh 5 and enters the filter gap 6, and the remaining filtered sludge is temporarily retained in the silt removal transfer box 1.

[0042] When the squeezing plate 4 is completed, the water filtered into the filter gap 6 is discharged through the drain pipe 7, and the filtered sludge temporarily retained in the silt removal transfer box 1 is discharged by the silt discharge mechanism. The specific silt discharge process is: first, the squeezing driver 3 is used to pull the squeezing plate 4 to reset, and then the silt discharge driver 8 is started. The silt discharge driver 8 pushes the silt discharge push plate 9 to slide in the direction of the sealing groove 103. During the sliding process of the silt discharge push plate 9, the sealing baffle 10 is pushed to slide synchronously by the connecting push rod 11, and the sealing baffle 10 slides out of the sealing groove 103; when the silt discharge push plate 9 slides into the sealing groove At 103, the sliding stops. At this time, the sealing baffle 10 is located outside the rear side of the dredging transfer box 1, and the filtered sludge between the sealing baffle 10 and the dredging push plate 9 is in a suspended state. At this time, the filtered sludge falls downward from the space below the sealing baffle 10 and the dredging push plate 9 under the action of its own gravity (of course, in order to ensure that the filtered sludge can fall downward, other pushing structures can be set or the filtered sludge can be manually pushed out of the space between the sealing baffle 10 and the dredging push plate 9). The filtered sludge can be collected and transported away in a unified manner using a transfer cart in the existing technology.

[0043] In this embodiment, by setting up an extrusion mechanism and a silt discharge mechanism, the dehydration of the water-containing silt can be automatically completed, thereby making river dredging more efficient and cost-saving; at the same time, the operating directions of squeezing the water-containing silt and filtering the silt in this scheme are perpendicular to each other, which can conveniently and efficiently complete the silt dehydration operation.

[0044] Example 2

[0045] The difference between the second embodiment and the first embodiment is that: Figure 4 As shown, T-shaped guide grooves are horizontally arranged on the front and rear sides of the extrusion plate 4, and guide plates 12 that slide with the T-shaped guide grooves are fixedly connected to the silt discharge push plate 9 and / or the sealing baffle 10. In this embodiment, guide plates 12 are welded on the side walls of the silt discharge push plate 9 and the sealing baffle 10 facing the silt removal transfer box 1. When the extrusion plate 4 squeezes the water-containing silt in the silt removal transfer box 1, the guide plate 12 is inserted into the T-shaped guide groove and slides relative to the T-shaped guide groove. The T-shaped guide groove can assist in stabilizing the silt discharge push plate 9 and the sealing baffle 10, so that when the extrusion plate 4 squeezes the water-containing silt and causes the silt to exert pressure on the silt discharge push plate 9 and the sealing baffle 10, the silt discharge push plate 9 and the sealing baffle 10 are prevented from being subjected to pressure and a gap is formed between the silt removal push plate 9 and the sealing baffle 10 and the silt removal transfer box 1, thereby reducing the occurrence of silt leakage during the extrusion process.

[0046] Example 3

[0047] The difference between the third embodiment and the first embodiment is that: Figure 5As shown, in this embodiment, a cleaning mechanism for cleaning the filter steel mesh 5 is connected to the silt discharge push plate 9, and the cleaning mechanism includes a brush 13 fixedly connected to the silt discharge push plate 9, and the brush 13 is located on the side wall of the silt discharge push plate 9 close to the filter steel mesh 5, and a vertically arranged mounting groove 901 is opened on the side wall of the silt discharge push plate 9 close to the filter steel mesh 5, and the brush 13 is fixed in the mounting groove 901 by screws. The length of the brush 13 is slightly larger than the depth of the mounting groove 901, so that the top end of the brush 13 can appropriately extend out of the mounting groove 901 and play a good cleaning role on the filter steel mesh 5. At the same time, in order to ensure the long-term cleaning performance of the brush 13, the material of the brush 13 can be a wear-resistant and non-damageable metal material such as stainless steel wire.

[0048] Example 4

[0049] The difference between the fourth embodiment and the first embodiment is that: Figure 6 As shown, the filtering mechanism in this embodiment also includes an auxiliary filter screen 14, which is located between the water inlet end of the drain pipe 7 and the filter gap 6. The auxiliary filter screen 14 is used to further filter the water entering the drain pipe 7 to reduce the possibility of blockage of the drain pipe 7.

[0050] The above description is merely an embodiment of the present invention, and the commonly known specific technical solutions and / or features of the solution are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be considered as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed in this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A river channel dredging and transfer device, comprising a dredging transfer box and a dredging inlet provided on one side of the top of the dredging transfer box, characterized in that: A squeezing mechanism is slidably connected to the side wall of the dredging transfer box, and the squeezing mechanism and the dredging transfer box slide together to squeeze the silt inside the dredging transfer box. Before squeezing the silt, the squeezing mechanism is located below the silt inlet; a filtering mechanism is provided on the side of the dredging transfer box opposite to the squeezing mechanism, and the filtering mechanism is connected to a drainage mechanism; a silt discharge mechanism is slidably connected inside the silt discharge transfer box, and the sliding direction of the silt discharge mechanism is perpendicular to the sliding direction of the squeezing mechanism.

2. The river dredging and transporting device according to claim 1, characterized in that: The extrusion mechanism includes an extrusion driver and an extrusion plate fixedly connected to the extrusion driver. The extrusion driver is fixedly connected to the dredging transfer box, and the extrusion plate is slidably connected to the inside of the dredging transfer box.

3. The river dredging and transporting device according to claim 2, characterized in that: The silt discharge mechanism includes a silt discharge driver, a silt discharge push plate and a sealing baffle. The silt discharge driver is fixedly connected to the silt removal transfer box, the silt discharge push plate is fixedly connected to the silt discharge driver, and an intermediate connecting piece is fixedly connected between the silt discharge push plate and the sealing push plate. The silt discharge push plate and the sealing push plate are provided with silt discharge pushing grooves and sealing through grooves on the two side surfaces facing each other on the silt removal transfer box. When the squeezing mechanism squeezes the silt in the silt removal transfer box, the silt discharge push plate is located in the silt discharge pushing groove and the sealing push plate is located in the sealing through groove.

4. The river dredging and transfer device according to claim 3, characterized in that: A T-shaped guide groove is provided on the side surface of the extrusion plate, and a guide plate that slides in cooperation with the T-shaped guide groove is fixedly connected to the silt removal push plate and / or the sealing baffle.

5. The river dredging and transporting device according to claim 3, characterized in that: The filtering mechanism includes a filter steel mesh, which is vertically fixedly connected to the dredging transfer box and arranged opposite to the extrusion mechanism. A filter gap is provided between the side of the filter steel mesh facing away from the extrusion mechanism and the inner wall of the dredging transfer box, and the drainage mechanism is connected to the filter gap.

6. The river dredging and transporting device according to claim 5, characterized in that: The drainage mechanism includes a drainage pipe, a water inlet end of the drainage pipe is communicated with the bottom end of the filter gap, and a water outlet end of the drainage pipe extends outside the dredging transfer box.

7. The river dredging and transporting device according to claim 5, characterized in that: The silt removal push plate is connected to a cleaning mechanism for cleaning the filter steel mesh.

8. The river dredging and transporting device according to claim 7, characterized in that: The cleaning mechanism includes a brush fixedly connected to the silt removal push plate.

9. The river dredging and transporting device according to claim 8, characterized in that: A vertically arranged mounting groove is provided on one end of the silt removal push plate facing the filter steel mesh, and the brush is fixedly connected in the mounting groove.

10. The river dredging and transporting device according to any one of claims 1 to 9, characterized in that: The filtering mechanism further comprises an auxiliary filtering screen fixedly connected to the dredging transfer box, and the auxiliary filtering screen is located between the water inlet end of the drainage pipe and the filtering gap.

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