Mbr membrane tank pretreatment system based on sewage treatment

Abstract

The invention discloses an mbr membrane pool pretreatment system based on sewage treatment, and relates to the technical field of sewage treatment, the mbr membrane pool pretreatment system comprises a box body and a filter cartridge mounted in the box body, and also comprises a sewage guide pool; the circulating flocculation mechanism comprises a plurality of mixing barrels mounted in the box body, and a mixing assembly and a control assembly which are mounted in the mixing barrels; the flow mixing mechanism comprises a mixing pipe mounted in the box body and a feeding bin mounted at the bottom of the mixing pipe; a driving mechanism; the deep filtering mechanism comprises a filter screen mounted at the bottom of the box body, a discharging box arranged below the filter screen, a drainage pipe mounted on the front surface of the discharging box and a cleaning assembly for cleaning the filter screen; according to the sewage flocculation treatment device, a flocculating agent is quantitatively added into the sewage with the same volume in batches according to the proportion, the flocculating agent and the sewage are uniformly mixed, the sewage flocculation time is ensured under the condition that the sewage is subjected to continuous flocculation treatment, and meanwhile, the sewage flocculation treatment efficiency and effect are improved.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, in particular to an MBR membrane pool pretreatment system for sewage treatment. Background Art

[0002] When treating sewage, in order to reduce the workload of the MBR membrane group and optimize the utilization efficiency of the MBR membrane group, it is necessary to pretreat the sewage in the front section of the MBR membrane pool to reduce the sludge concentration entering the MBR membrane pool, thereby reducing the sludge accumulation problem of the MBR membrane group.

[0003] At present, when treating sewage, a sedimentation tank is usually set up and flocculants are added to make the sewage flocculate and settle. However, when adding flocculants, since the sewage is flowing, it is difficult for the staff to quantitatively add flocculants according to the amount of sewage, resulting in poor sewage flocculation effect and difficulty in fully flocculating the sewage. Secondly, sewage flocculation and sedimentation requires a certain amount of time, and small-volume sewage pretreatment equipment is difficult to quickly reduce the sludge level of sewage in a short time; in addition, after flocculation and sedimentation of existing sewage, the sludge at the bottom of the sedimentation tank needs to be manually cleaned. When cleaning the sedimentation tank, the pretreatment of the sewage needs to be suspended, which makes it difficult to pretreat the sewage continuously. Summary of the invention

[0004] The purpose of the present invention is to provide a pretreatment system based on an MBR membrane pool for sewage treatment to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above object, the present invention provides the following technical solution: based on the MBR membrane pool pretreatment system for sewage treatment, comprising a box body and a filter cartridge installed inside the box body, and also comprising: A sewage guide tank, which is installed on the top of the box; A circulating flocculation mechanism connected to the sewage guide tank, the circulating flocculation mechanism comprising a plurality of mixing drums installed inside the box body, a mixing assembly installed inside the mixing drum, and a control assembly; A mixing flow mechanism, which includes a mixing pipe installed inside the box body and a feed bin installed at the bottom of the mixing pipe; A driving mechanism, which is installed inside the box and is used to drive the filter cartridge to rotate; The deep filtering mechanism comprises a filter screen installed at the bottom of a box body, a discharge box arranged below the filter screen, a drainage pipe installed on the front of the discharge box and a cleaning component for cleaning the filter screen.

[0006] Furthermore, the tops of the plurality of mixing drums are connected to the bottom of the sewage guiding tank; An injection pipe is installed on the top of the mixing cylinder.

[0007] Further, the mixing assembly comprises a first transmission shaft rotatably connected to the inside of the mixing drum, a turntable slidably sleeved on the outside of the first transmission shaft, and a plurality of slide grooves provided in the turntable; The top end of the first transmission shaft extends to the outside of the mixing drum; A stirring blade is slidably connected inside the slide groove, the top of the stirring blade slides and extends to the outside of the turntable, a plurality of springs are fixedly connected to the bottom of the stirring blade, and the bottom end of the spring is fixedly connected to the inner wall of the bottom of the slide groove; The inside of the box is rotatably connected to a second transmission shaft, the outside of the second transmission shaft is sequentially fixedly sleeved with a plurality of worms along its length direction, the outside of the first transmission shaft is fixedly sleeved with a worm wheel, and the worm is meshed with the worm wheel.

[0008] Further, the control assembly includes a first reciprocating screw rotatably connected to the interior of the mixing drum, a sealing ring threadedly connected to the exterior of the first reciprocating screw, and a plurality of conduits installed inside the rotating disk; The outer wall of the sealing ring abuts against the inner wall of the mixing drum, and the rotating disk is rotatably connected to the inside of the sealing ring; The top end of the first reciprocating screw extends to the outside of the mixing barrel and is fixedly connected to a first gear; The box body is rotatably connected with a screw rod inside, and a rack is screwed on the outside of the screw rod, and the rack meshes with each first gear in sequence when moving; A guide rod is provided on one side of the screw rod, the guide rod is fixed to the inner wall of the box body, and the rack is also slidably sleeved on the outside of the guide rod; A solenoid valve is installed on the conduit.

[0009] Furthermore, a first motor is installed on the outer wall of one side of the box body, and an output end of the first motor is fixedly connected to one end of the second transmission shaft; The second transmission shaft and the screw rod are connected via a transmission member, which is located outside the box. The transmission member includes two synchronous wheels that are respectively fixedly sleeved on the outside of the second transmission shaft and the outside of the screw rod, and a synchronous belt that is connected to the outside of the two synchronous wheels.

[0010] Furthermore, a mud discharge pipe is installed on the outer wall of the other side of the box; The filter cartridge is rotatably connected between the feed bin and the mud discharge pipe; A spiral material guide rod is fixedly connected inside the filter cylinder.

[0011] Furthermore, the driving mechanism includes a second motor mounted on the outer wall of the other side of the box body and a gear ring fixedly sleeved on the outside of the filter cartridge; A second gear is fixedly connected to the output end of the second motor, and the second gear is meshed with the ring gear.

[0012] Furthermore, the pore size of the filter screen is smaller than the pore size of the filter cartridge.

[0013] Further, the cleaning assembly includes a third transmission shaft rotatably connected to the inside of the box, a second reciprocating screw fixedly sleeved on the outside of the third transmission shaft, and slag guide channels respectively installed on both sides of the bottom of the box; The third transmission shaft is externally fixedly sleeved with a third gear, and the third gear is meshed with a gear ring; The exterior of the second reciprocating screw is threaded with a scraper bar, and the bottom of the scraper bar abuts against the top of the filter screen; A slag guiding ramp is installed between the filter screen and the slag guiding channel.

[0014] Compared with the prior art, the MBR membrane pool pretreatment system for sewage treatment provided by the present invention has the following beneficial effects: by filling the interior of each mixing cylinder with sewage in turn, adding a quantitative flocculant, and uniformly mixing the flocculant with the sewage, by quantitatively adding flocculants to the same volume of sewage in batches in proportion, and by ensuring the flocculation time of the sewage under the condition of continuous flocculation treatment of the sewage, the efficiency and effect of the sewage flocculation treatment are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the box of the present invention; Figure 3 It is a schematic diagram of the structure of the circulating flocculation mechanism of the present invention; Figure 4 It is a schematic diagram of the internal structure of the mixing drum of the present invention; Figure 5 It is a schematic diagram of the structure of the mixing assembly of the present invention; Figure 6 It is a schematic diagram of the catheter structure of the present invention; Figure 7 It is a schematic diagram of the structure of the driving mechanism and the depth filtering mechanism of the present invention.

[0017] Description of reference numerals: 1. Box body; 2. Filter cartridge; 3. Mixing cartridge; 4. First transmission shaft; 5. Turntable; 6. Slideway; 7. Stirring blade; 8. Spring; 9. Worm; 10. Worm wheel; 11. First reciprocating screw; 12. Sealing ring; 13. Conduit; 14. First gear; 15. Screw; 16. Rack; 17. Guide rod; 18. Solenoid valve; 19. First motor; 20. Second transmission shaft; 21. Transmission member; 22. Mixing tube; 23. Feed bin; 24. Mud discharge pipe; 25. Spiral guide rod; 26. Second motor; 27. Gear ring; 28. Second gear; 29. ​​Filter screen; 30. Discharge box; 31. Drain pipe; 32. Third transmission shaft; 33. Second reciprocating screw; 34. Slag guide channel; 35. Third gear; 36. Scraper; 37. Slag guide ramp; 38. Sewage guide tank; 39. Injection pipe. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] Example: See Figure 1 - Figure 7 , based on the MBR membrane pool pretreatment system for sewage treatment, including a box body 1 and a filter cartridge 2 installed inside the box body 1, and also including: A sewage guide tank 38, which is installed on the top of the box body 1; A circulating flocculation mechanism is connected to the sewage guide tank 38 and is used to control the quantitative mixing of the flocculant and the sewage and to control the time of mixing and flocculating the flocculant and the sewage. The circulating flocculation mechanism includes a plurality of mixing drums 3 installed inside the housing 1, a mixing assembly and a control assembly installed inside the mixing drum 3; the tops of the plurality of mixing drums 3 are connected to the bottom of the sewage guide tank 38; an injection tube 39 is installed on the top of the mixing drum 3, and the mixing assembly includes a first transmission shaft 4 rotatably connected to the inside of the mixing drum 3, a turntable 5 slidably sleeved on the outside of the first transmission shaft 4, and a plurality of slide grooves 6 opened inside the turntable 5; a key pin is fixed to the outside of the first transmission shaft 4, and the turntable 5 A key slot is provided inside the housing 1, and a key pin is slidably connected inside the key slot; the top end of the first transmission shaft 4 extends to the outside of the mixing drum 3; a stirring blade 7 is slidably connected inside the chute 6, and the top of the stirring blade 7 slides and extends to the outside of the turntable 5, and a plurality of springs 8 are fixedly connected to the bottom of the stirring blade 7, and the bottom end of the spring 8 is fixedly connected to the inner wall of the bottom of the chute 6; the inside of the housing 1 is rotatably connected to the second transmission shaft 20, and the outside of the second transmission shaft 20 is sequentially fixedly sleeved with a plurality of worms 9 along its length direction, and the outside of the first transmission shaft 4 is fixedly sleeved with a worm wheel 10, and the worm 9 is meshed with the worm wheel 10, and the control component includes a first transmission shaft 20 rotatably connected to the inside of the mixing drum 3 A reciprocating screw 11, a sealing ring 12 screwed to the outside of the first reciprocating screw 11, and a plurality of conduits 13 installed inside the turntable 5; the outer wall of the sealing ring 12 abuts against the inner wall of the mixing drum 3, and the turntable 5 is rotatably connected to the inside of the sealing ring 12; the top of the first reciprocating screw 11 extends to the outside of the mixing drum 3 and is fixedly connected to a first gear 14; a screw rod 15 is rotatably connected to the inside of the box body 1, and a rack 16 is screwed to the outside of the screw rod 15. The rack 16 meshes with each first gear 14 in sequence when moving, and the first gear 14 is a one-way gear; a guide rod 17 is provided on one side of the screw rod 15, and the guide rod 17 is fixedly connected to the inner wall of the box body 1. The rack 16 is also slidably sleeved on the outside of the guide rod 17; a solenoid valve 18 is installed on the guide tube 13, and when the turntable 5 moves upward, the solenoid valve 18 is opened, and when the turntable 5 moves downward, the solenoid valve 18 is closed. A first motor 19 is installed on the outer wall of one side of the box body 1, and the output end of the first motor 19 is fixedly connected to one end of the second transmission shaft 20; the second transmission shaft 20 and the screw rod 15 are connected by a transmission member 21, and the transmission member 21 is located outside the box body 1. The transmission member 21 includes two synchronous wheels that are respectively fixedly sleeved on the outside of the second transmission shaft 20 and the outside of the screw rod 15, and a synchronous belt that is connected to the outside of the two synchronous wheels; By controlling the first motor 19 to drive the second transmission shaft 20 to rotate clockwise, the multiple worms 9 rotate synchronously, and the screw rod 15 rotates synchronously through the transmission connection of the transmission member 21. When the screw rod 15 rotates clockwise, it drives the rack 16 to move leftward along the outside of the guide rod 17. When the rack 16 moves leftward, it meshes with each first gear 14 in turn, and the first reciprocating screw 11 rotates accordingly. In the process from the beginning of the meshing of the rack 16 with the first gear 14 to the loss of meshing, the sealing ring 12 first moves up along the inner wall of the mixing drum 3 from its bottom to its top, and the turntable 5 moves upward synchronously to The sewage flocculated on the top of the sealing ring 12 and the turntable 5 is discharged downward through the conduit 13, and then the sealing ring 12 moves down from the top to the bottom along the inner wall of the mixing drum 3, and then the sewage in the sewage guide tank 38 is pumped into the mixing drum 3, and then a certain amount of flocculant is added to the mixing drum 3 through the injection pipe 39. At the same time, when the worm 9 rotates, the first transmission shaft 4 is driven to rotate through the meshing effect between the worm 9 and the worm wheel 10, and then the turntable 5 and the stirring blades 7 are driven to rotate, so that the flocculant is evenly distributed in the sewage, so that the sewage is fully flocculated. When the rack 16 continues to move to the left, it will meet with the next first The gear 14 is meshed, and the flocculated sewage in the mixing drum 3 is discharged first, and then the sewage is pumped into the next mixing drum 3, and a certain amount of flocculant is added to the mixing drum 3, and this cycle is repeated. When the rack 16 moves to the left, the flocculated sewage in the mixing drum 3 is discharged first, and then the interior of each mixing drum 3 is filled with sewage in turn, and a certain amount of flocculant is added, and the flocculant and the sewage are evenly mixed at the same time. Then the first motor 19 is controlled to drive the second transmission shaft 20 to rotate counterclockwise, and the transmission connection of the transmission member 21 drives the screw rod 15 to rotate synchronously counterclockwise, thereby driving the rack 16 along the guide rod The outer portion of 17 moves to the right, and when the rack 16 moves to the right, it will also mesh with each first gear 14 in sequence. However, since the first gear 14 is a one-way gear, when the rack 16 moves to the right and meshes with the first gear 14, the first gear 14 rotates accordingly, but the first reciprocating screw 11 does not rotate accordingly. After the rack 16 moves to the right and resets, the first motor 19 is controlled to drive the screw 15 to rotate clockwise, driving the rack 16 to move to the left again, and repeating the above operation, by ensuring the sewage flocculation time under the condition of continuous flocculation treatment of sewage, the efficiency and effect of sewage flocculation treatment are improved; It is worth mentioning that when the stirring blade 7 abuts against the inner wall at the top of the mixing drum 3, as the turntable 5 continues to move upward, the stirring blade 7 moves toward the inside of the slide 6, and the spring 8 is compressed. When the turntable 5 moves downward, the rebound force of the spring 8 drives the stirring blade 7 to move upward, and the subsequent sewage can continue to be stirred.

[0020] The mixing mechanism is used to guide the fully flocculated sewage into the filter cartridge 2. The mixing mechanism includes a mixing tube 22 installed inside the box 1 and a feed bin 23 installed at the bottom of the mixing tube 22. A mud discharge pipe 24 is installed on the outer wall of the other side of the box 1. The filter cartridge 2 is rotatably connected between the feed bin 23 and the mud discharge pipe 24. A spiral guide rod 25 is fixed inside the filter cartridge 2. After the flocculated sewage is discharged downward through the conduit 13, it enters the filter cartridge 2 through the mixing tube 22 and the feed bin 23. When the filter cartridge 2 rotates, the flocculated sewage is dehydrated, and the flocculated agglomerated particles are filtered inside the filter cartridge 2. Through the setting of the spiral guide rod 25, the agglomerated particles are driven to move to the left in turn, enter the mud discharge pipe 24, and are finally discharged through the mud discharge pipe 24.

[0021] The driving mechanism is installed inside the housing 1 and is used to drive the filter cartridge 2 to rotate. The driving mechanism includes a second motor 26 installed on the outer wall of the other side of the housing 1 and a gear ring 27 fixedly sleeved on the outside of the filter cartridge 2; a second gear 28 is fixedly connected to the output end of the second motor 26, and the second gear 28 is meshed with the gear ring 27; The second motor 26 is controlled to drive the second gear 28 to rotate, and the meshing between the second gear 28 and the gear ring 27 drives the filter cartridge 2 to rotate, so that the flocculated sewage entering the filter cartridge 2 is dehydrated.

[0022] The deep filtering mechanism is used to filter the sewage thrown out from the filter cartridge 2, and the deep filtering mechanism includes a filter screen 29 installed at the bottom of the box body 1, a discharge box 30 arranged below the filter screen 29, a drain pipe 31 installed on the front of the discharge box 30, and a cleaning assembly for cleaning the filter screen 29; the aperture of the filter screen 29 is smaller than the aperture of the filter cartridge 2, and the cleaning assembly includes a third transmission shaft 32 rotatably connected to the inside of the box body 1, a second reciprocating screw 33 fixedly sleeved on the outside of the third transmission shaft 32, and slag guide channels 34 respectively installed on both sides of the bottom of the box body 1; the outside of the third transmission shaft 32 is fixedly sleeved with a third gear 35, and the third gear 35 is meshed with the gear ring 27; the outside of the second reciprocating screw 33 is screwed with a scraper bar 36, and the bottom of the scraper bar 36 abuts against the top of the filter screen 29; a slag guide ramp 37 is installed between the filter screen 29 and the slag guide channel 34; The sewage thrown out by the filter cylinder 2 is filtered again through the filter screen 29 to filter the small particles again. When the ring gear 27 rotates, it drives the third gear 35 to rotate synchronously, and then drives the second reciprocating screw 33 to rotate synchronously through the third transmission shaft 32. The scraper bar 36 then moves back and forth left and right along the top of the filter screen 29 to scrape the particulate impurities on the top of the filter screen 29 to the left and right. When the scraper bar 36 abuts against one side of the slag guide ramp 37, the particulate impurities are driven to the inclined surface of the top of the slag guide ramp 37. The scraper bar 36 cleans the top of the filter screen 29 many times. When more and more particulate impurities accumulate, the particulate impurities cross the slag guide ramp 37 and fall into the slag guide channel 34, and are discharged through the slag guide channel 34. The sewage passing through the filter screen 29 enters the discharge box 30 and reaches the next sewage treatment station through the drain pipe 31.

[0023] It should be noted that the device structure and drawings of the present invention mainly describe the principle of the present invention. In terms of the technology of the design principle, the settings of the power mechanism, power supply system and control system of the device are not fully described. On the premise that the technical personnel in the field understand the principle of the above invention, the specific details of the power mechanism, power supply system and control system can be clearly known. The control method of the application document is to automatically control by a controller, and the control circuit of the controller can be realized by simple programming by the technical personnel in the field; the above only describes some exemplary embodiments of the present invention by way of explanation. Undoubtedly, for ordinary technicians in the field, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A sewage treatment MBR membrane pool pretreatment system, comprising a housing (1) and a filter cartridge (2) installed inside the housing (1), characterized in that: Also includes: A sewage guide tank (38) installed on the top of the box (1); A circulating flocculation mechanism connected to the sewage guide tank (38), the circulating flocculation mechanism comprising a plurality of mixing drums (3) installed inside the housing (1), a mixing component and a control component installed inside the mixing drums (3); A flow mixing mechanism, comprising a mixing tube (22) installed inside the box (1) and a feed bin (23) installed at the bottom of the mixing tube (22); A driving mechanism, which is installed inside the box (1) and is used to drive the filter cartridge (2) to rotate; A deep filtering mechanism comprises a filter screen (29) installed at the bottom of a box body (1), a discharge box (30) arranged below the filter screen (29), a drainage pipe (31) installed on the front of the discharge box (30), and a cleaning component for cleaning the filter screen (29).

2. The sewage treatment based MBR membrane pool pretreatment system according to claim 1 is characterized in that: The tops of the plurality of mixing drums (3) are all connected to the bottom of the sewage guide tank (38); An injection pipe (39) is installed on the top of the mixing cylinder (3).

3. The MBR membrane pool pretreatment system for sewage treatment according to claim 2 is characterized in that: The mixing assembly comprises a first transmission shaft (4) rotatably connected to the interior of the mixing drum (3), a rotating disk (5) slidably sleeved on the exterior of the first transmission shaft (4), and a plurality of sliding grooves (6) provided in the interior of the rotating disk (5); The top end of the first transmission shaft (4) extends to the outside of the mixing drum (3); A stirring blade (7) is slidably connected inside the slide groove (6), the top of the stirring blade (7) slides and extends to the outside of the turntable (5), a plurality of springs (8) are fixedly connected to the bottom of the stirring blade (7), and the bottom ends of the springs (8) are fixedly connected to the inner wall of the bottom of the slide groove (6); The interior of the housing (1) is rotatably connected to a second transmission shaft (20); the exterior of the second transmission shaft (20) is sequentially and fixedly sleeved with a plurality of worms (9) along its length direction; the exterior of the first transmission shaft (4) is fixedly sleeved with a worm wheel (10); the worm (9) is meshed with the worm wheel (10).

4. The MBR membrane pool pretreatment system for sewage treatment according to claim 3 is characterized in that: The control assembly comprises a first reciprocating screw (11) rotatably connected to the interior of the mixing barrel (3), a sealing ring (12) threadedly connected to the exterior of the first reciprocating screw (11), and a plurality of conduits (13) installed inside the rotating disk (5); The outer wall of the sealing ring (12) abuts against the inner wall of the mixing drum (3), and the rotating disk (5) is rotatably connected to the inside of the sealing ring (12); The top end of the first reciprocating screw (11) extends to the outside of the mixing barrel (3) and is fixedly connected to a first gear (14); The box body (1) is rotatably connected to a screw rod (15) inside, and a rack (16) is threadedly connected to the outside of the screw rod (15), and the rack (16) meshes with each first gear (14) in sequence when moving; A guide rod (17) is provided on one side of the screw rod (15), the guide rod (17) is fixedly connected to the inner wall of the box body (1), and the rack (16) is also slidably sleeved on the outside of the guide rod (17); A solenoid valve (18) is installed on the conduit (13).

5. The MBR membrane pool pretreatment system for sewage treatment according to claim 4 is characterized in that: A first motor (19) is mounted on an outer wall of one side of the box body (1), and an output end of the first motor (19) is fixedly connected to one end of a second transmission shaft (20); The second transmission shaft (20) and the screw rod (15) are transmission-connected via a transmission member (21).

6. The sewage treatment based MBR membrane pool pretreatment system according to claim 5 is characterized in that: A mud discharge pipe (24) is installed on the outer wall of the other side of the box body (1); The filter cartridge (2) is rotatably connected between the feed bin (23) and the mud discharge pipe (24); A spiral material guide rod (25) is fixedly connected inside the filter cylinder (2).

7. The MBR membrane pool pretreatment system for sewage treatment according to claim 6 is characterized in that: The driving mechanism comprises a second motor (26) mounted on the outer wall of the other side of the housing (1) and a gear ring (27) fixedly sleeved on the outside of the filter cartridge (2); The output end of the second motor (26) is fixedly connected to a second gear (28), and the second gear (28) is meshed with a gear ring (27).

8. The sewage treatment based MBR membrane pool pretreatment system according to claim 7 is characterized in that: The pore size of the filter screen (29) is smaller than the pore size of the filter cartridge (2).

9. The sewage treatment based MBR membrane pool pretreatment system according to claim 8, characterized in that: The cleaning assembly comprises a third transmission shaft (32) rotatably connected to the interior of the box body (1), a second reciprocating screw (33) fixedly sleeved on the exterior of the third transmission shaft (32), and slag guide channels (34) respectively mounted on both sides of the bottom of the box body (1); A third gear (35) is fixedly sleeved on the outside of the third transmission shaft (32), and the third gear (35) is meshed with the ring gear (27); A scraper bar (36) is screwed onto the outside of the second reciprocating screw (33), and the bottom of the scraper bar (36) abuts against the top of the filter screen (29); A slag guiding ramp (37) is installed between the filter screen (29) and the slag guiding channel (34).

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