Self-cleaning drainage equipment for domestic sewage

Abstract

The utility model relates to the technical field of domestic sewage treatment, in particular to self-cleaning drainage equipment for domestic sewage. The self-cleaning drainage equipment for domestic sewage comprises a middle pipe, a water pump is installed on one side of the middle pipe, the liquid inlet end of the water pump communicates with a buffer tank, and the liquid outlet end of the water pump communicates with the middle pipe; the treatment pipe is mounted at one end of the middle pipe, and a filtering mechanism is mounted in the treatment pipe; the settling pipe is inserted into the treatment pipe and located behind the filtering mechanism, and a blocking piece used for blocking the settling pipe is installed on the treatment pipe; the settling pipe is transparent, a drain pipe is mounted at the bottom end of the settling pipe, a first control valve is embedded in the drain pipe, the drain pipe is communicated with a water quality purification tank, an oil discharge pipe is embedded in the middle of the settling pipe, a second control valve is embedded in the oil discharge pipe, and the oil discharge pipe is communicated with a dirty oil storage tank. The self-cleaning drainage equipment for domestic sewage has the advantages of convenience in impurity removal and high efficiency in oil removal and purification.

Description

Technical Field

[0001] The utility model relates to the technical field of domestic sewage treatment, in particular to a self-cleaning drainage device for domestic sewage. Background Art

[0002] When drilling for oil, the drilling team works in the field far away from the urban area, and the cost of domestic water supply is high, and there is a lack of a complete sewage treatment system. Due to the increased requirements for environmental protection, the previous discharge methods such as digging infiltration pits and evaporation have been banned. At present, the conventional method of treating domestic sewage of the well team is to transport it to the designated sewage treatment plant for treatment, which increases the overall transportation cost and wastes water resources.

[0003] Domestic sewage from field drilling teams is treated. At present, the domestic sewage from drilling teams has complex components, but it mainly contains a large amount of petroleum (animal and vegetable oils), COD, ammonia nitrogen and suspended solids, and has the characteristics of small sewage volume and intermittent discharge. Therefore, filtering and oil-water separation of domestic sewage at the source of discharge can avoid the aggravation of domestic sewage pollution during storage and transportation. However, the existing equipment cannot effectively treat domestic sewage with small sewage volume and intermittent discharge characteristics.

[0004] Therefore, it is necessary to provide a new self-cleaning drainage equipment for domestic sewage to solve the above-mentioned technical problems. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a self-cleaning drainage device for domestic sewage which is convenient for removing impurities and efficient in removing oil and purifying.

[0006] The self-cleaning drainage equipment for domestic sewage provided by the utility model comprises:

[0007] An intermediate pipe, a water pump is installed on one side of the intermediate pipe, a liquid inlet end of the water pump is connected to a buffer tank, and a liquid outlet end of the water pump is connected to the intermediate pipe;

[0008] A treatment tube is installed at one end of the intermediate tube, and a filtering mechanism is installed in the treatment tube;

[0009] A sedimentation pipe is inserted on the treatment pipe and located behind the filtering mechanism, and a plugging piece for plugging the sedimentation pipe is installed on the treatment pipe; the sedimentation pipe is transparent, and a drain pipe is installed at the bottom end of the sedimentation pipe, a control valve 1 is embedded in the drain pipe, and the drain pipe is connected to a water purification box, an oil drain pipe is embedded in the middle of the sedimentation pipe, a control valve 2 is embedded in the oil drain pipe, and the oil drain pipe is connected to a dirty oil storage tank, a transmission rod is rotatably installed in the sedimentation pipe, and a plurality of grid plates are evenly installed on one end of the transmission rod extending into the sedimentation pipe, a servo motor for driving the transmission rod to rotate is installed at the bottom end of the sedimentation pipe, a hanging plate is installed on the oil drain pipe, a CCD camera is embedded in the hanging plate, the CCD camera is electrically connected to a host computer, and the host computer is electrically connected to the servo motor, control valve 1, control valve 2, filtering mechanism and the plugging piece.

[0010] Preferably, the filtering mechanism includes a rectangular tube inserted on the processing tube, the rectangular tube is penetrated by a rectangular groove connected with the processing tube, a filter screen is installed on the side of the rectangular groove close to the sedimentation tube, an electric rod is installed on the bottom end of the rectangular tube, the telescopic end of the electric rod extends into the rectangular tube and a filter screen is fixedly installed, and a baffle is fixedly installed on the side of the filter screen facing away from the filter screen.

[0011] Preferably, a discharge groove is opened through the top end of the rectangular tube, a guide rod is inserted into the top end of the rectangular tube, a pressure plate is installed at the bottom end of the guide rod, and a connecting spring is sleeved on the guide rod, one end of the connecting spring is fixedly connected to the rectangular tube, and the other end of the connecting spring is fixedly connected to the pressure plate, an electric rod 2 is fixedly installed on one side of the rectangular tube, a push plate is installed at the telescopic end of the electric rod 2, and the push plate is plugged into and matched with the discharge groove.

[0012] Preferably, a limiting bolt is threadedly installed on the top end of the rectangular tube.

[0013] Preferably, a hydrophilic and oleophobic membrane is embedded in one end of the drainage pipe close to the sedimentation pipe.

[0014] Preferably, an oleophilic and hydrophobic membrane is embedded in one end of the oil drain pipe close to the sedimentation pipe.

[0015] Preferably, the water purification box is provided with an anaerobic zone, an anoxic zone, an aerobic zone, an MBR membrane zone and a clean water zone which are interconnected from left to right.

[0016] Preferably, the sealing member includes a mounting frame, which is fixedly mounted on one end of the processing tube, and an electric rod three is mounted on the mounting frame, a sealing vertical plate for sealing the processing tube is fixedly mounted on the telescopic end of the electric rod three, and a sealing horizontal plate for tightly covering the sedimentation tube is mounted on the bottom end of the sealing vertical plate.

[0017] Compared with the related art, the self-cleaning drainage equipment for domestic sewage provided by the utility model has the following beneficial effects:

[0018] 1. The utility model provides a self-cleaning drainage device for domestic sewage. By arranging a filtering mechanism in a treatment pipe, the filtering mechanism utilizes a rectangular tube, a filter screen 1, an electric rod 1, a filter screen 2, a baffle, a guide rod, a pressure plate, a connecting spring, a second electric rod, a push plate, a rectangular groove and a discharge groove to separate solid impurities in the water, so as to facilitate the later sewage purification treatment;

[0019] 2. By arranging a drain pipe, a control valve 1, a hydrophilic and oleophobic membrane, an oil drain pipe, a control valve 2, an oleophilic and hydrophobic membrane, a transmission rod, a grid plate, a servo motor, a hanging plate and a CCD camera in the sedimentation tube, the oil in the sedimentation tube can be stirred at a high speed after the sedimentation tube is sealed by the plugging piece, thereby accelerating the oil-liquid separation during stirring, and the CCD camera is used to monitor the distribution of water and oil, so as to realize automatic drainage and automatic oil drainage after continuous oil-water separation, and the discharged water is then purified in a water purification box and can be discharged after treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A structural schematic diagram of a preferred embodiment of the self-cleaning drainage device for domestic sewage provided by the utility model;

[0021] Figure 2 A schematic diagram of the structure of a settling pipe installed on a processing pipe provided by the utility model;

[0022] Figure 3 This is a schematic structural diagram of a cross section of a treatment tube provided by the utility model with a settling tube installed thereon;

[0023] Figure 4 A schematic diagram of the structure of the filtering mechanism provided by the utility model;

[0024] Figure 5 This is a structural schematic diagram of the water purification box provided by the utility model.

[0025] Numbers in the figure: 1, middle pipe; 2, water pump; 3, buffer tank; 4, treatment pipe; 5, filtering mechanism; 51, rectangular pipe; 52, filter screen 1; 53, electric rod 1; 54, filter screen 2; 55, baffle; 56, guide rod; 57, pressure plate; 561, connecting spring; 58, electric rod 2; 59, push plate; 501, rectangular groove; 502, discharge groove; 511, limit bolt; 6, sedimentation pipe; 61, drainage pipe; 611, control valve 1; 612, hydrophilic and oleophobic Membrane; 62, oil drain pipe; 621, control valve 2; 622, oleophilic and hydrophobic membrane; 63, transmission rod; 64, grid plate; 65, servo motor; 66, suspension plate; 67, CCD camera; 7, water purification box; 701, anaerobic zone; 702, anoxic zone; 703, aerobic zone; 704, MBR membrane zone; 705, clean water zone; 8, dirty oil storage tank; 9, plugging parts; 91, mounting frame; 92, electric pole 3; 93, sealing vertical plate; 94, sealing horizontal plate. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0027] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0028] See also Figures 1 to 5 The utility model provides a self-cleaning drainage device for domestic sewage, comprising:

[0029] An intermediate pipe 1, a water pump 2 is installed on one side of the intermediate pipe 1, a liquid inlet end of the water pump 2 is connected to a buffer tank 3, and a liquid outlet end of the water pump 2 is connected to the intermediate pipe 1;

[0030] The processing tube 4 is installed at one end of the intermediate tube 1, and a filtering mechanism 5 is installed in the processing tube 4;

[0031] The settling pipe 6 is inserted on the treatment pipe 4 and is located behind the filtering mechanism 5. The treatment pipe 4 is equipped with a plugging member 9 for plugging the settling pipe 6. The settling pipe 6 is transparent. A drain pipe 61 is installed at the bottom of the settling pipe 6. A control valve 611 is embedded in the drain pipe 61, and the drain pipe 61 is connected to the water purification box 7. An oil drain pipe 62 is embedded in the middle of the settling pipe 6. A control valve 621 is embedded in the drain pipe 62, and the oil drain pipe 62 is connected to the dirty oil storage tank 8. A transmission rod 63 is rotatably installed, and a plurality of grid plates 64 are evenly installed on one end of the transmission rod 63 extending into the sedimentation tube 6. A servo motor 65 for driving the transmission rod 63 to rotate is installed at the bottom end of the sedimentation tube 6. A hanging plate 66 is installed on the oil drain pipe 62, and a CCD camera 67 is embedded on the hanging plate 66. The CCD camera 67 is electrically connected to a host computer, and the host computer is electrically connected to the servo motor 65, control valve 1 611, control valve 2 621, filtering mechanism 5 and blocking member 9.

[0032] It should be noted that: when in use, the buffer tank 3 is used to receive sewage discharged intermittently in life, and then the sewage is transported to the intermediate pipe 1 by the water pump 2, and then flows into the treatment pipe 4, and the solid impurities in the liquid flowing through it are first intercepted and filtered by the filtering mechanism 5, and the filtered liquid flows into the sedimentation pipe 6. After flowing in, the sedimentation pipe 6 is tightly covered by the blocking member 9, and then the servo motor 65 is started to drive the transmission rod 63 to drive the grid plate 64 to rotate in the sedimentation pipe 6, so as to stir the oil in the sedimentation pipe 6 at a high speed, accelerate the separation of the oil, and then stand still, the heavier water is distributed under the oil, and then the oil is separated by the sieve 6. The CCD camera 67 is used to monitor the oil distribution layer in the sedimentation pipe 6. The drain pipe 61 is first controlled to drain water through the control valve 1 611. When the oil distribution layer is lower than the oil drain pipe 62, the drain pipe 61 is closed, and the oil drain pipe 62 is controlled to drain oil through the control valve 2 621 to discharge the oil into the waste oil storage tank 8. After the discharge, the drain pipe 61 is controlled to continue to drain water until it is completely discharged. The deoiled water discharged from the drain pipe 61 flows into the water purification box 7 for efficient purification, and then the plugging component 9 is removed from the top of the sedimentation pipe 6, and the filtered water flows into the sedimentation pipe 6 again. The above operation process is repeated to continuously separate oil and water.

[0033] In the embodiments of the present invention, please refer to Figures 1 to 5 The filtering mechanism 5 includes a rectangular tube 51 inserted on the processing tube 4, a rectangular groove 501 connected to the processing tube 4 is penetrated through the rectangular tube 51, a filter screen 52 is installed on the side of the rectangular groove 501 close to the sedimentation tube 6, an electric rod 53 is installed at the bottom end of the rectangular tube 51, and a telescopic end of the electric rod 53 extends into the rectangular tube 51 and is fixedly installed with a filter screen 54, and a baffle 55 is fixedly installed on the side of the filter screen 54 away from the filter screen 52;

[0034] A discharge groove 502 is formed through the top of the rectangular tube 51, a guide rod 56 is inserted into the top of the rectangular tube 51, a pressure plate 57 is installed at the bottom of the guide rod 56, and a connecting spring 561 is sleeved on the guide rod 56, one end of the connecting spring 561 is fixedly connected to the rectangular tube 51, and the other end of the connecting spring 561 is fixedly connected to the pressure plate 57, an electric rod 2 58 is fixedly installed on one side of the rectangular tube 51, and a push plate 59 is installed at the telescopic end of the electric rod 2 58, and the push plate 59 is plugged into and matched with the discharge groove 502.

[0035] It should be noted that: when the filter mechanism 5 is in use, the liquid introduced into the processing tube 4 is intercepted by the filter screen 1 52 when flowing through the rectangular groove 501. When a certain amount of impurities are intercepted, the electric rod 1 53 is controlled to drive the filter screen 2 54 and the baffle 55 to move upward synchronously. When moving, the impurities intercepted by the filter screen 1 52 are pushed upward along the rectangular tube 51 until they contact the pressure plate 57. Under the pressure of the connecting spring 561, the filter screen 2 54 squeezes the solid impurities and filters the water therein until the pressure plate 57 is pushed to the top of the discharge groove 502. Then, the electric rod 2 58 is started to drive the push plate 59 to push the solid impurities between the filter screen 2 54 and the pressure plate 57 out of the discharge groove 502, thereby achieving efficient filtration and removing solid impurities.

[0036] In the present embodiment, a limiting bolt 511 is threadedly installed at the top end of the rectangular tube 51. By turning the limiting bolt 511 to extend into the rectangular tube 51, the rising height of the pressing plate 57 can be controlled so that it rises to a height slightly higher than the discharge trough 502, which is convenient for the pushing plate 59 to push the material.

[0037] In the embodiments of the present invention, please refer to Figures 1 to 5 A hydrophilic and oleophobic membrane 612 is embedded in one end of the drainage pipe 61 close to the sedimentation pipe 6;

[0038] An oleophilic and hydrophobic membrane 622 is embedded in one end of the oil discharge pipe 62 close to the sedimentation pipe 6 .

[0039] It should be noted that when the drain pipe 61 drains water, only water is discharged from the mixed liquid in the oil-water distribution layer, and when the oil drain pipe 62 drains oil, only oil is discharged from the mixed liquid in the oil-water distribution layer, thereby further improving the oil-water separation effect.

[0040] In the embodiments of the present invention, please refer to Figures 1 to 5 The water purification box 7 is provided with an anaerobic zone 701, an anoxic zone 702, an aerobic zone 703, an MBR membrane zone 704 and a clean water zone 705 which are interconnected from left to right;

[0041] It should be noted that when the water purification box 7 is used, the discharged water is subjected to anaerobic treatment and aerobic treatment in sequence, and the organic matter in the water is first subjected to anaerobically phosphorus release in the anaerobic zone 701; then it enters the anoxic zone 702, and the denitrifying bacteria in the anoxic zone 702 use the remaining organic matter and the refluxed nitrate to denitrify by denitrification; after the denitrification reaction is completed, it enters the aerobic zone 703, and the remaining organic matter is oxidized by aerobic bacteria here, and finally the mud and water are separated through the MBR membrane zone 704, and the effluent is discharged to the clean water zone 705, realizing self-cleaning discharge, and the sludge part trapped in the membrane pool is returned to the anaerobic zone 701, realizing cyclic anaerobic phosphorus release.

[0042] In the embodiments of the present invention, please refer to Figures 1 to 5 The plugging member 9 includes a mounting frame 91, which is fixedly mounted on one end of the processing pipe 4, and an electric rod 3 92 is mounted on the mounting frame 91, and a sealing vertical plate 93 for sealing the processing pipe 4 is fixedly mounted on the telescopic end of the electric rod 3 92, and a sealing horizontal plate 94 for tightly covering the sedimentation pipe 6 is mounted on the bottom end of the sealing vertical plate 93;

[0043] It should be noted that when the sealing member 9 is in use, when the sedimentation tube 6 needs to be sealed, the electric rod 3 92 is driven to move the sealing vertical plate 93 to the front side of the sedimentation tube 6 until the sealing horizontal plate 94 is completely tightly covered on the top of the sedimentation tube 6 to complete the sealing. When the sedimentation tube 6 needs to be filled with liquid, the sealing vertical plate 93 is driven to retreat from the sedimentation tube 6.

[0044] The working principle of the self-cleaning drainage equipment for domestic sewage provided by the utility model is as follows:

[0045] When in use, the buffer tank 3 is used to receive sewage discharged intermittently in life, and then the water pump 2 is used to transport it to the middle pipe 1, and then it flows into the treatment pipe 4. The solid impurities in the liquid flowing through it are first intercepted and filtered by the filtering mechanism 5, and the filtered liquid flows into the sedimentation pipe 6. After flowing in, the sedimentation pipe 6 is tightly covered by the blocking member 9, and then the servo motor 65 is started to drive the transmission rod 63 to drive the grid plate 64 to rotate in the sedimentation pipe 6, so as to stir the oil in the sedimentation pipe 6 at a high speed, accelerate the separation of the oil, and then stand still. The heavier water is distributed below the oil, and then the CCD is used. The camera 67 monitors the oil distribution layer in the sedimentation pipe 6, and first controls the drain pipe 61 to drain water through the control valve 1 611. When the oil distribution layer is lower than the oil drain pipe 62, the drain pipe 61 is closed, and the oil drain pipe 62 is controlled to drain oil through the control valve 2 621, and the oil is discharged into the waste oil storage tank 8. After the discharge, the drain pipe 61 is controlled to continue to drain until the discharge is complete. The de-oiled water discharged from the drain pipe 61 flows into the water purification tank 7 for efficient purification, and then the plugging member 9 is removed from the top of the sedimentation pipe 6, and the filtered water flows into the sedimentation pipe 6 again. Repeat the above operation process to continuously separate oil and water;

[0046] When the filter mechanism 5 is in use, the liquid introduced into the processing tube 4 is intercepted by the filter screen 1 52 when flowing through the rectangular groove 501. When a certain amount of impurities are intercepted, the electric rod 1 53 is controlled to drive the filter screen 2 54 and the baffle 55 to move upward synchronously. When moving, the impurities intercepted by the filter screen 1 52 are pushed upward along the rectangular tube 51 until they contact the pressure plate 57. Under the pressure of the connecting spring 561, the filter screen 2 54 squeezes the solid impurities and filters the water therein until the pressure plate 57 is pushed to the top of the discharge groove 502. Then, the electric rod 2 58 is started to drive the push plate 59 to push the solid impurities between the filter screen 2 54 and the pressure plate 57 out of the discharge groove 502, thereby achieving efficient filtration and removing solid impurities.

[0047] When the water purification box 7 is in use, the discharged water is subjected to anaerobic treatment and aerobic treatment in sequence, and the organic matter in the water is first subjected to anaerobically phosphorus release in the anaerobic zone 701; then the water enters the anoxic zone 702, and the denitrifying bacteria in the anoxic zone 702 use the remaining organic matter and the refluxed nitrate to denitrify by denitrification; after the denitrification reaction is completed, the water enters the aerobic zone 703, and the remaining organic matter is oxidized by aerobic bacteria here, and finally the mud and water are separated through the MBR membrane zone 704, and the effluent is discharged to the clean water zone 705, realizing self-cleaning discharge, and the sludge part trapped in the membrane pool is returned to the anaerobic zone 701, realizing cyclic anaerobic phosphorus release.

[0048] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0049] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A self-cleaning drainage device for domestic sewage, comprising: An intermediate pipe (1), a water pump (2) being installed on one side of the intermediate pipe (1), a liquid inlet end of the water pump (2) being connected to a buffer tank (3), and a liquid outlet end of the water pump (2) being connected to the intermediate pipe (1); It is characterized by further comprising: A processing tube (4) is installed at one end of the intermediate tube (1), and a filtering mechanism (5) is installed in the processing tube (4); A sedimentation pipe (6) is inserted into the treatment pipe (4) and is located behind the filtering mechanism (5); a plugging member (9) for plugging the sedimentation pipe (6) is installed on the treatment pipe (4); the sedimentation pipe (6) is transparent; a drainage pipe (61) is installed at the bottom end of the sedimentation pipe (6); a control valve 1 (611) is embedded in the drainage pipe (61), and the drainage pipe (61) is connected to a water purification tank (7); an oil drainage pipe (62) is embedded in the middle of the sedimentation pipe (6); a control valve 2 (621) is embedded in the oil drainage pipe (62), and the oil drainage pipe (62) is connected to a waste oil storage tank (8); A transmission rod (63) is rotatably mounted in the sedimentation tube (6); a plurality of grid plates (64) are evenly mounted on one end of the transmission rod (63) extending into the sedimentation tube (6); a servo motor (65) for driving the transmission rod (63) to rotate is mounted at the bottom end of the sedimentation tube (6); a suspension plate (66) is mounted on the oil discharge tube (62); a CCD camera (67) is embedded on the suspension plate (66); the CCD camera (67) is electrically connected to a host computer; the host computer is electrically connected to the servo motor (65), a control valve 1 (611), a control valve 2 (621), a filtering mechanism (5) and a blocking member (9).

2. The self-cleaning drainage equipment for domestic sewage according to claim 1, characterized in that: The filtering mechanism (5) comprises a rectangular tube (51) inserted into the processing tube (4), a rectangular groove (501) extending through the rectangular tube (51) and communicating with the processing tube (4), a filter screen (52) being installed on a side of the rectangular groove (501) close to the sedimentation tube (6), an electric rod (53) being installed on the bottom end of the rectangular tube (51), a telescopic end of the electric rod (53) extending into the rectangular tube (51) and fixedly installed with a filter screen (54), and a baffle (55) being fixedly installed on a side of the filter screen (54) facing away from the filter screen (52).

3. The self-cleaning drainage equipment for domestic sewage according to claim 2, characterized in that: A discharge groove (502) is formed through the top of the rectangular tube (51), a guide rod (56) is inserted into the top of the rectangular tube (51), a pressing plate (57) is installed at the bottom of the guide rod (56), and a connecting spring (561) is sleeved on the guide rod (56), one end of the connecting spring (561) is fixedly connected to the rectangular tube (51), and the other end of the connecting spring (561) is fixedly connected to the pressing plate (57), and an electric rod 2 (58) is fixedly installed on one side of the rectangular tube (51), and a push plate (59) is installed at the telescopic end of the electric rod 2 (58), and the push plate (59) is plugged into and matched with the discharge groove (502).

4. The self-cleaning drainage equipment for domestic sewage according to claim 3, characterized in that: A limiting bolt (511) is threadedly mounted on the top end of the rectangular tube (51).

5. The self-cleaning drainage equipment for domestic sewage according to claim 1, characterized in that: A hydrophilic and oleophobic membrane (612) is embedded in one end of the drainage pipe (61) close to the sedimentation pipe (6).

6. The self-cleaning drainage equipment for domestic sewage according to claim 1, characterized in that: An oleophilic and hydrophobic membrane (622) is embedded in one end of the oil discharge pipe (62) close to the sedimentation pipe (6).

7. The self-cleaning drainage equipment for domestic sewage according to claim 1, characterized in that: The water purification box (7) is provided with an anaerobic zone (701), an anoxic zone (702), an aerobic zone (703), an MBR membrane zone (704) and a clean water zone (705) which are interconnected from left to right.

8. The self-cleaning drainage equipment for domestic sewage according to claim 1, characterized in that: The plugging member (9) comprises a mounting frame (91), the mounting frame (91) being fixedly mounted on one end of the processing tube (4), and an electric rod three (92) being mounted on the mounting frame (91), a sealing vertical plate (93) for sealing the processing tube (4) being fixedly mounted on the telescopic end of the electric rod three (92), and a sealing horizontal plate (94) for tightly covering the sedimentation tube (6) being mounted on the bottom end of the sealing vertical plate (93).

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