CN218969063U - Fold spiral shell formula sludge dewaterer - Google Patents

Abstract

The utility model relates to the technical field of dehydrators, in particular to a spiral-fold type sludge dehydrator which can intercept and collect hard large particles in sludge and improve the reliability of equipment; the device comprises a stacked spiral sludge dehydrator, a screw and a mud inlet bucket, wherein the screw is rotatably arranged in the stacked spiral sludge dehydrator, and the mud inlet bucket is arranged on the stacked spiral sludge dehydrator; still include the filter, receive sediment box, rabbling mechanism, press the material mechanism and scrape and sweep the mechanism, the filter is provided with a plurality of sieve meshes, the filter is installed in the bottom of advancing the mud bucket, the symmetry is provided with two row's sediment mouths on advancing the left and right sides wall of mud bucket, two receipts sediment boxes are installed respectively on advancing the left and right sides wall of mud bucket and are connected with two row's sediment mouths, rabbling mechanism and scrape sweep the mechanism and install in advancing the mud bucket, the rabbling mechanism will advance mud in the mud bucket and beat, press the material mechanism and install on advancing the mud bucket and promote in folding spiral shell formula mud hydroextractor with mud, the screw rod is connected with rabbling mechanism and press the transmission of material mechanism, press the material mechanism and scrape and sweep the mechanism linkage.

Description

Fold spiral shell formula sludge dewaterer

Technical Field

The utility model relates to the technical field of dehydrators, in particular to a spiral-pile type sludge dehydrator.

Background

The spiral shell formula sludge dewaterer is provided with the enrichment portion and the dehydration portion of intercommunication, and the upper end of enrichment portion is provided with the mud import, and the bottom of dehydration portion is provided with the mud export, and mud is concentrated the back at enrichment portion through gravity, is transported the dehydration portion, along with the gradual diminishing of filter gap and pitch in the in-process that advances to and under the barrier effect of back pressure plate, produces very big interior pressure, and the volume is constantly reduced, reaches the purpose of abundant dehydration.

In the prior art, the spiral shell formula sludge dewaterer that stacks of degree of depth dehydration that application number "CN202222314744.3" proposed, this hydroextractor is provided with diaphragm, cavity, extrusion pneumatic cylinder, extrusion piece and door body in the mud export, can carry out compaction to the mud sediment and handle, the follow-up transportation of being convenient for. In the prior art, the sludge inlet is simpler, most of the stacked screw type sludge dehydrators cannot efficiently filter large-particle hard objects such as stones and metal blocks in the entering sludge, and the hard objects can cause damage to internal parts of the stacked screw type sludge dehydrators and even block between the movable ring and the fixed ring, so that the sludge is leaked, and the reliability is reduced.

Disclosure of Invention

In order to solve the technical problems, the utility model provides the spiral-pile type sludge dewatering machine which can intercept and collect hard large particles in sludge and improve the reliability of equipment.

The utility model relates to a spiral-pile type sludge dewatering machine, which comprises a spiral-pile type sludge dewatering machine, a screw and a sludge inlet bucket, wherein the screw is rotatably arranged in the spiral-pile type sludge dewatering machine, the lower part of the rear end of the spiral-pile type sludge dewatering machine is provided with a sludge outlet, the upper part of the front end of the spiral-pile type sludge dewatering machine is provided with a sludge inlet, and the sludge inlet bucket is arranged on the sludge inlet of the spiral-pile type sludge dewatering machine; the device comprises a filter plate, a slag collecting box, a stirring mechanism, a pressing mechanism and a scraping mechanism, wherein the filter plate is provided with a plurality of sieve holes, the filter plate is arranged at the bottom of a mud inlet hopper, two slag discharging openings are symmetrically arranged on the left side wall and the right side wall of the mud inlet hopper, the two slag discharging openings are flush with the upper end face of the filter plate, the two slag collecting boxes are respectively arranged on the left side wall and the right side wall of the mud inlet hopper, inlets of the two slag collecting boxes are respectively connected with the two slag discharging openings of the mud inlet hopper, the stirring mechanism and the scraping mechanism are arranged in the mud inlet hopper, the scraping mechanism scrapes and sweeps hard large particles intercepted by the filter plate into the two slag collecting boxes, the stirring mechanism scatters sludge in the mud inlet hopper, the pressing mechanism is arranged on the mud inlet hopper, the pressing mechanism pushes the sludge into a spiral-pile-type sludge dehydrator, and a screw is in transmission connection with the stirring mechanism and the pressing mechanism; during operation, the screw rod rotates in the spiral shell formula sludge dewaterer, the screw rod drives rabbling mechanism and swager to move, after mud passes through the pipeline input and advances in the mud bucket, rabbling mechanism breaks up the caking in the mud, break away from out from mud with the stereoplasm macroparticle in the mud simultaneously, screw rod drive swager moves, swager pushes down in the mud bucket mud, make mud leak into the spiral shell formula sludge dewaterer fast through the sieve mesh of filter, the filter intercepts the stereoplasm macroparticle in the mud, swager and scrape the mechanism linkage, scrape and sweep the mechanism and scrape the filter, sweep the stereoplasm macroparticle of filter interception into two sediment boxes through two slag discharge openings that advance the mud bucket, realize the interception and the collection to the stereoplasm macroparticle such as stone in the mud, the metal piece, avoid above-mentioned stereoplasm macroparticle to get into in the spiral shell formula sludge dewaterer and cause spiral shell formula sludge dewaterer and screw rod damage, improve equipment's reliability.

Preferably, the material pressing mechanism comprises a swing arm, a pull rod, a pressure rod and a pressure plate, a driving shaft of the screw rod extends out of the front end of the stacked screw type sludge dewatering machine, the inner end of the swing arm is connected with the driving shaft of the screw rod, the outer end of the swing arm is rotationally connected with the lower end of the pull rod, the upper end of the pull rod is rotationally connected with the front end of the pressure rod, the rear end of the pressure rod is rotationally connected with the rear wall of the upper end of the sludge inlet hopper, the pressure plate is arranged at the lower part of the pressure rod, the pressure plate extends into the sludge inlet hopper, and the pressure rod is linked with the scraping mechanism; after the sludge is input into the sludge hopper, the screw rod rotates to drive the swing arm to rotate, the swing arm drives the front end of the pressing rod to open and close up and down through the pull rod, so that the pressing rod drives the pressing plate to open and close up and down to push the sludge on the upper part of the sludge hopper downwards, the speed that the sludge leaks into the spiral shell-type sludge dewatering machine through the sieve holes of the filter plate is accelerated, and the working efficiency of the equipment is improved.

Preferably, the device further comprises an upper connector and a lower connector, wherein the upper end of the pull rod is rotationally connected with the front end of the compression bar through the upper connector, the upper connector is provided with a ball head rod and a ball socket seat which are rotationally connected, the lower end of the pull rod is rotationally connected with the upper end of the swing arm through the lower connector, and the lower connector is provided with a connecting rod and a ball head bearing which are rotationally connected; the pull rod is through setting up connector and lower connector for when the swing arm rotated, the pull rod can stably drive the front end of depression bar and open and shut from top to bottom, guarantees the pull rod and can carry out the swing of fore-and-aft and left-right direction in a flexible way again, and the practicality is high.

Preferably, the scraping mechanism comprises two scraping plates, a plurality of supporting rods, a rotating shaft and a connecting rod, wherein the two scraping plates are symmetrically and slidingly arranged in the mud inlet hopper left and right, the lower end faces of the two scraping plates scrape the upper end faces of the filter plates, the lower ends of the plurality of supporting rods are respectively and rotationally connected with the two scraping plates, the upper ends of the plurality of supporting rods are rotationally connected with the rotating shaft, the lower ends of the connecting rod are rotationally connected with the rotating shaft, and the upper ends of the connecting rod are rotationally connected with the lower end faces of the pressing plates; when the pressing rod drives the pressing plate to open up and down, the pressing plate drives the rotating shaft to move up and down through the connecting rod, the rotating shaft pulls the two scraping plates to be close to or far away from each other synchronously through the plurality of supporting rods, when the two scraping plates are far away from each other, the two scraping plates scrape and push hard large particles intercepted by the filtering plates into two slag collecting boxes, so that the hard large particles are prevented from blocking sieve holes of the filtering plates, and the hard large particles are collected.

Preferably, the scraper further comprises two guide slopes, and the guide slopes are arranged on the opposite sides of the two scrapers; when two scrapers are close to each other, the hard large particles in the middle of the two scrapers roll to the outer sides of the two scrapers along the two guide slopes, so that the hard large particles can be conveniently scraped and collected.

Preferably, the stirring mechanism comprises two belt pulleys, a transmission belt, a gear box, two stirring shafts and a plurality of stirring rods, the gear box 8 is provided with an input shaft and two output shafts, the gear box is arranged on the outer wall of the front side of the mud inlet hopper, the belt pulleys are concentrically arranged on the driving shaft of the screw rod and the input shaft of the gear box, the transmission belt is sleeved and linked on the two belt pulleys, the two output shafts of the gear box are in transmission connection with the two stirring shafts, the stirring rods are arranged on the two stirring shafts, the stirring rods are positioned in the mud inlet hopper, and the two stirring shafts and the stirring rods are positioned above the filter plates; when the screw rod rotates, the screw rod drives the gear box to operate through the two belt wheels and the driving belt, the two output shafts of the gear box drive the two stirring shafts to rotate, the two stirring shafts drive the stirring rods to rotate, the stirring rods stir sludge in the sludge hopper, agglomerations in the sludge are scattered, and the speed of leaking the sludge downwards through the filter plate is improved.

Compared with the prior art, the utility model has the beneficial effects that: during operation, the screw rod rotates in the spiral shell formula sludge dewaterer, the screw rod drives rabbling mechanism and swager to move, after mud passes through the pipeline input and advances in the mud bucket, rabbling mechanism breaks up the caking in the mud, break away from out from mud with the stereoplasm macroparticle in the mud simultaneously, screw rod drive swager moves, swager pushes down in the mud bucket mud, make mud leak into the spiral shell formula sludge dewaterer fast through the sieve mesh of filter, the filter intercepts the stereoplasm macroparticle in the mud, swager and scrape the mechanism linkage, scrape and sweep the mechanism and scrape the filter, sweep the stereoplasm macroparticle of filter interception into two sediment boxes through two slag discharge openings that advance the mud bucket, realize the interception and the collection to the stereoplasm macroparticle such as stone in the mud, the metal piece, avoid above-mentioned stereoplasm macroparticle to get into in the spiral shell formula sludge dewaterer and cause spiral shell formula sludge dewaterer and screw rod damage, improve equipment's reliability.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic view of the front cross-section of the present utility model;

FIG. 3 is a schematic view of the axial structure of the present utility model;

FIG. 4 is an enlarged schematic view of the structure of the pressing mechanism and the like;

FIG. 5 is an enlarged schematic view of the structure of the stirring mechanism and the like;

FIG. 6 is an enlarged schematic view of the structure of the scraping mechanism and the like;

the reference numerals in the drawings: 1. a spiral-pile type sludge dewatering machine; 2. a screw; 3. a mud inlet hopper; 4. a filter plate; 5. a slag collecting box; 6. swing arms; 7. a pull rod; 8. a compression bar; 9. a pressing plate; 10. an upper connector; 11. a lower connector; 12. a scraper; 13. a support rod; 14. a rotating shaft; 15. a link rod; 16. a guiding slope; 17. a belt wheel; 18. a transmission belt; 19. a gear box; 20. a stirring shaft; 21. stirring rod.

Detailed Description

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. This utility model may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Examples

As shown in fig. 1 to 6, a spiral-pile type sludge dewatering machine comprises a spiral-pile type sludge dewatering machine 1, a screw rod 2 and a sludge inlet hopper 3, wherein the screw rod 2 is rotatably arranged in the spiral-pile type sludge dewatering machine 1, a sludge outlet is formed in the lower part of the rear end of the spiral-pile type sludge dewatering machine 1, a sludge inlet is formed in the upper part of the front end of the spiral-pile type sludge dewatering machine 1, and the sludge inlet hopper 3 is arranged on the sludge inlet of the spiral-pile type sludge dewatering machine 1; the device is characterized by further comprising a filter plate 4, a slag collecting box 5, a stirring mechanism, a pressing mechanism and a scraping mechanism, wherein the filter plate 4 is provided with a plurality of sieve holes, the filter plate 4 is arranged at the bottom of the mud inlet hopper 3, two slag discharging ports are symmetrically arranged on the left side wall and the right side wall of the mud inlet hopper 3, the two slag discharging ports are flush with the upper end face of the filter plate 4, the two slag collecting boxes 5 are respectively arranged on the left side wall and the right side wall of the mud inlet hopper 3, inlets of the two slag collecting boxes 5 are respectively connected with the two slag discharging ports of the mud inlet hopper 3, the stirring mechanism and the scraping mechanism are arranged in the mud inlet hopper 3, the scraping mechanism scrapes and sweeps hard large particles intercepted by the filter plate 4 into the two slag collecting boxes 5, the stirring mechanism scatters mud in the mud inlet hopper 3, the pressing mechanism is arranged on the mud inlet hopper 3, the pressing mechanism pushes the mud into the spiral-fold type mud dehydrator 1, and the screw 2 is in transmission connection with the stirring mechanism and the pressing mechanism and the scraping mechanism; the pressing mechanism comprises a swing arm 6, a pull rod 7, a press rod 8 and a press plate 9, wherein a driving shaft of a screw rod 2 extends out of the front end of the stacked screw type sludge dewatering machine 1, the inner end of the swing arm 6 is connected with the driving shaft of the screw rod 2, the outer end of the swing arm 6 is rotationally connected with the lower end of the pull rod 7, the upper end of the pull rod 7 is rotationally connected with the front end of the press rod 8, the rear end of the press rod 8 is rotationally connected with the rear wall of the upper end of the mud inlet hopper 3, the press plate 9 is arranged at the lower part of the press rod 8, the press plate 9 extends into the mud inlet hopper 3, and the press rod 8 is linked with the scraping mechanism; the scraping mechanism comprises two scraping plates 12, a plurality of supporting rods 13, a rotating shaft 14 and a connecting rod 15, wherein the two scraping plates 12 are symmetrically and slidingly arranged in the mud inlet hopper 3 left and right, the lower end faces of the two scraping plates 12 are scraped with the upper end faces of the filter plates 4, the lower ends of the plurality of supporting rods 13 are respectively and rotatably connected with the two scraping plates 12, the upper ends of the plurality of supporting rods 13 are rotatably connected with the rotating shaft 14, the lower end of the connecting rod 15 is rotatably connected with the rotating shaft 14, and the upper end of the connecting rod 15 is rotatably connected with the lower end face of the pressing plate 9; the stirring mechanism comprises two belt pulleys 17, a transmission belt 18, a gear box 19, two stirring shafts 20 and a plurality of stirring rods 21, wherein the gear box 198 is provided with an input shaft and two output shafts, the gear box 19 is arranged on the outer wall of the front side of the mud bucket 3, the belt pulleys 17 are concentrically arranged on the driving shaft of the screw 2 and the input shaft of the gear box 19, the transmission belt 18 is sleeved and linked on the two belt pulleys 17, the two output shafts of the gear box 19 are in transmission connection with the two stirring shafts 20, the two stirring shafts 20 are provided with the plurality of stirring rods 21, the plurality of stirring rods 21 are positioned in the mud bucket 3, and the two stirring shafts 20 and the plurality of stirring rods 21 are positioned above the filter plates 4;

when in work, the screw rod 2 rotates in the spiral-fold type sludge dewatering machine 1, after sludge is input into the sludge inlet hopper 3 through a pipeline, the screw rod 2 drives the gear box 19 to operate through the two belt wheels 17 and the transmission belt 18, the two output shafts of the gear box 19 drive the two stirring shafts 20 to rotate, the two stirring shafts 20 drive the stirring rods 21 to rotate, the stirring rods 21 stir the sludge in the sludge inlet hopper 3, the caking in the sludge is broken up, the speed of the sludge leaking downwards through the filter plate 4 is improved, meanwhile, hard large particles in the sludge are separated from the sludge, the screw rod 2 drives the material pressing mechanism to operate, the screw rod 2 rotates to drive the swing arm 6 to rotate, the swing arm 6 pulls the front end of the pressure rod 8 to open and close up and down through the pull rod 7, the pressure rod 8 drives the pressure plate 9 to open and close up and down to push the sludge at the upper part of the sludge inlet hopper 3 downwards, the speed that mud leaks into the spiral shell formula sludge dewaterer 1 through the sieve mesh of filter 4 is accelerated, improve the work efficiency of equipment, filter 4 intercepts the stereoplasm macroparticle in the mud, when depression bar 8 drove clamp plate 9 and opens and shuts from top to bottom, clamp plate 9 drives pivot 14 through link 15 and reciprocates, pivot 14 is close to or keeps away from in step through two scraper blades 12 of a plurality of branches 13 pulling, when two scraper blades 12 keep away from, two scraper blades 12 scrape the stereoplasm macroparticle of filter 4 interception and sweep and advance two receipts sediment box 5, avoid stereoplasm macroparticle to block up the sieve mesh of filter 4, realize the interception and the collection to stereoplasm macroparticle such as stone, metal piece in the mud, avoid above-mentioned stereoplasm macroparticle to get into to fold spiral shell formula sludge dewaterer 1 and screw rod 2 damage in the spiral shell formula sludge dewaterer 1, improve the reliability of equipment.

As shown in figures 1 to 6, when the spiral-pile type sludge dewatering machine disclosed by the utility model works, firstly, when the spiral-pile type sludge dewatering machine works, the screw 2 rotates in the spiral-pile type sludge dewatering machine 1, after sludge is input into the sludge hopper 3 through a pipeline, the screw 2 drives the gear box 19 to operate through the two belt pulleys 17 and the transmission belt 18, the two output shafts of the gear box 19 drive the two stirring shafts 20 to rotate, the two stirring shafts 20 drive the plurality of stirring rods 21 to rotate, the plurality of stirring rods 21 stir the sludge in the sludge hopper 3, agglomerate in the sludge is broken, hard large particles in the sludge are separated from the sludge, then the screw 2 rotates to drive the swing arm 6 to rotate, the swing arm 6 drives the front end of the press rod 8 to open and close up and down through the pull rod 7, so that the press rod 8 drives the press plate 9 to open and close up and down, the sludge in the upper part of the sludge hopper 3 is quickly leaked into the spiral-pile type sludge dewatering machine 1 through the sieve holes of the filter plate 4, the filter plate 4 drives the rotating shafts 20 to move up and down through the connecting rods 15, the rotating shafts 14 to stir the sludge, the hard large particles in the sludge are blocked, and finally, the two scraping plates 14 are driven by the connecting rods 15 to move up and down, and the two scraping plates 12 are driven by the two scraping plates 12 to move towards each other to be far away from the two scraping plates 12, and the hard particles 12 are separated from each other, and are far away from each other, and the hard particles 12 are separated from each other, and the hard particles are separated from the two scraping plates 12 and the two scraping plates 12 are far away from each other.

The main functions realized by the utility model are as follows:

the method can intercept and collect hard large particles in the sludge, and improve the reliability of equipment;

the sludge is accelerated to enter the spiral sludge dehydrator 1 through the pressing mechanism;

can stir the sludge and break up the caking in the sludge.

The stacked spiral sludge dewatering machine 1, the screw rod 2, the sludge feeding hopper 3, the filter plate 4, the upper connector 10, the lower connector 11, the belt pulley 17, the driving belt 18 and the gear box 19 are purchased in the market, and a person skilled in the art only needs to install and operate according to the attached using instruction without creative labor.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.

Claims (6)

1. The utility model provides a fold spiral shell formula sludge dewaterer, includes fold spiral shell formula sludge dewaterer (1), screw rod (2) and advances mud bucket (3), and screw rod (2) rotate to install in folding spiral shell formula sludge dewaterer (1) inside, fold spiral shell formula sludge dewaterer (1) rear end lower part and be provided with out the mud mouth, fold spiral shell formula sludge dewaterer (1) front end upper portion is provided with into the mud mouth, advances mud bucket (3) and installs on folding spiral shell formula sludge dewaterer (1) into the mud mouth; the device is characterized by further comprising a filter plate (4), a slag collecting box (5), a stirring mechanism, a pressing mechanism and a scraping mechanism, wherein the filter plate (4) is provided with a plurality of sieve holes, the filter plate (4) is installed at the bottom of the mud feeding hopper (3), two slag discharging holes are symmetrically formed in the left side wall and the right side wall of the mud feeding hopper (3), the two slag discharging holes are flush with the upper end face of the filter plate (4), the two slag collecting boxes (5) are respectively installed on the left side wall and the right side wall of the mud feeding hopper (3), inlets of the two slag collecting boxes (5) are respectively connected with the two slag discharging holes of the mud feeding hopper (3), the stirring mechanism and the scraping mechanism are installed in the mud feeding hopper (3), the stirring mechanism scrapes and sweeps hard large particles intercepted by the filter plate (4) into the two slag collecting boxes (5), the stirring mechanism scatters sludge in the mud feeding hopper (3), the pressing mechanism is installed on the mud feeding hopper (3), and the pressing mechanism pushes the sludge into the spiral sludge dehydrator (1), and the stirring mechanism, the stirring mechanism and the pressing mechanism are connected with the pressing mechanism.

2. The stacked spiral sludge dewatering machine according to claim 1, wherein the material pressing mechanism comprises a swing arm (6), a pull rod (7), a pressing rod (8) and a pressing plate (9), a driving shaft of the screw rod (2) extends out of the front end of the stacked spiral sludge dewatering machine (1), the inner end of the swing arm (6) is connected with the driving shaft of the screw rod (2) to connect the outer end of the swing arm (6) with the lower end of the pull rod (7) in a rotating mode, the upper end of the pull rod (7) is connected with the front end of the pressing rod (8) in a rotating mode, the rear end of the pressing rod (8) is connected with the rear wall of the upper end of the sludge inlet hopper (3) in a rotating mode, the pressing plate (9) is installed at the lower portion of the pressing rod (8), the pressing plate (9) extends into the sludge inlet hopper (3), and the pressing rod (8) is in linkage with the scraping mechanism.

3. The spiral shell formula sludge dewatering machine of claim 2, characterized by further comprising an upper connector (10) and a lower connector (11), wherein the upper end of the pull rod (7) is rotationally connected with the front end of the compression rod (8) through the upper connector (10), the upper connector (10) is provided with a ball head rod and a ball socket seat which are rotationally connected, the lower end of the pull rod (7) is rotationally connected with the upper end of the swing arm (6) through the lower connector (11), and the lower connector (11) is provided with a connecting rod and a ball head bearing which are rotationally connected.

4. The spiral-type sludge dewatering machine according to claim 1, wherein the scraping mechanism comprises two scraping plates (12), a plurality of supporting rods (13), a rotating shaft (14) and a connecting rod (15), wherein the two scraping plates (12) are symmetrically installed in the sludge feeding hopper (3) in a sliding mode left and right, the lower end faces of the two scraping plates (12) are scraped with the upper end faces of the filter plates (4), the lower ends of the plurality of supporting rods (13) are respectively connected with the two scraping plates (12) in a rotating mode, the upper ends of the plurality of supporting rods (13) are connected with the rotating shaft (14) in a rotating mode, the lower ends of the connecting rod (15) are connected with the rotating shaft (14) in a rotating mode, and the upper ends of the connecting rod (15) are connected with the lower end faces of the press plates (9) in a rotating mode.

5. The spiral stack dewatering machine of claim 4, further comprising two guide ramps (16), wherein the guide ramps (16) are provided on opposite sides of the blades (12).

6. The spiral shell formula sludge dewatering machine of claim 1, wherein the stirring mechanism comprises two pulleys (17), a transmission belt (18), a gear box (19), two stirring shafts (20) and a plurality of stirring rods (21), the gear box (19) 8 is provided with an input shaft and two output shafts, the gear box (19) is arranged on the outer wall of the front side of the mud inlet hopper (3), the pulley (17) is concentrically arranged on the driving shaft of the screw (2) and the input shaft of the gear box (19), the transmission belt (18) is sheathed and linked on the two pulleys (17), the two output shafts of the gear box (19) are in transmission connection with the two stirring shafts (20), a plurality of stirring rods (21) are arranged on the two stirring shafts (20), the stirring rods (21) are positioned in the mud inlet hopper (3), and the two stirring shafts (20) and the stirring rods (21) are positioned above the filter plate (4).

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