EP0912222A1 - System for sucking sludge at the bottom of a sedimentation pond - Google Patents
System for sucking sludge at the bottom of a sedimentation pondInfo
- Publication number
- EP0912222A1 EP0912222A1 EP97931829A EP97931829A EP0912222A1 EP 0912222 A1 EP0912222 A1 EP 0912222A1 EP 97931829 A EP97931829 A EP 97931829A EP 97931829 A EP97931829 A EP 97931829A EP 0912222 A1 EP0912222 A1 EP 0912222A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fingers
- carriage
- guide rail
- central body
- pinion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/18—Construction of the scrapers or the driving mechanisms for settling tanks
- B01D21/20—Driving mechanisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0006—Settling tanks provided with means for cleaning and maintenance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/245—Discharge mechanisms for the sediments
Definitions
- the present invention relates to a system for sucking sludge from the bottom of a settling tank.
- the drive means described comprise a set of jacks and jaws which make it possible to advance the carriage step by step along the guide rail.
- the present invention aims to remedy the drawbacks of known systems, and to provide a system of the aforementioned type, extremely reliable, very economical to operate, capable of making it possible to locate, at any time, the carriage at the bottom of the basin.
- the system of the aforementioned type is characterized in that it comprises at least one longitudinal row of substantially cylindrical identical fingers, fixed relative to the bottom of the pelvis, arranged parallel to the same direction in a predetermined pitch, and in that the carriage comprises at least one driving pinion having a chain-type toothing formed by teeth adapted to mesh with said fingers, the radial length of the teeth being predetermined so that the free end of each tooth penetrates between two adjacent fingers at least to the point where the gap between said fingers is the smallest.
- a tooth of a pinion penetrating between two adjacent fingers on one side of these fingers drives out the other side the materials and debris located between these two fingers, which ensures the cleaning of the chain.
- the fingers are arranged vertically projecting relative to the upper surface of the guide rail, and the carriage comprises at least three pinions meshing with the fingers, two pinions being arranged on the same side of the fingers and a pinion being arranged on the other side of the fingers substantially halfway between the two other pinions.
- Such drive means make it possible to exert a large driving force of the carriage to overcome or break any obstacles, to clean the spaces between the fingers, and to ensure good alignment of the carriage with respect to the row of fingers.
- each pinion is driven by a gearmotor with alternating output controlled electronically, supplied with direct current at low voltage, the three gearmotors being supplied in parallel.
- a reliable and economical source of energy is thus used, allowing precise and efficient control of the operation of the truck.
- each gear motor is equipped with a revolution counter device.
- FIG. 1 is a schematic perspective view of an embodiment of the system according to the present invention
- FIG. 2 is a diagram illustrating the configuration of the carriage of FIG. 1 in the middle and at each of the ends of its trajectory
- - Figure 3 is a partial elevational view, with parts broken away, of the carriage of Figure 1;
- Figure 4 is a bottom view of the carriage of Figure 3;
- FIG. 5 is an enlarged partial view of a detail of Figure 4;
- Figure 6 is an enlarged front view taken from the left of Figure 3;
- - Figure 7 is a cutaway view along
- FIG. 8 is an enlarged partial view of a detail of Figure 1, -
- FIG. 9 is an enlarged view of a detail of Figure 6.
- the system 1 for sucking sludge at the bottom of a settling tank comprises a carriage 2 movable in a longitudinal direction of the tank indiçn-ted by the arrow 3 and supporting a transverse tubing 4 sludge suction adapted to be connected by a flexible pipe 6 to means 5 for sludge suction located outside the basin.
- the system 1 also includes a longitudinal guide rail 7 fixed to the bottom 8 of the basin by any fixing means shown diagrammatically at 9, for example feet fixed by screws to the bottom 8 of the basin.
- the system l also comprises drive means integral with the carriage 2 and adapted to engage with the guide rail 7 to advance the carriage 2 from one end 10 to the other end 11 of the basin, alternately in one direction. and in the other, along the guide rail 7 (see Figure 2).
- the system 1 comprises at least one longitudinal row 12 of substantially cylindrical identical fingers 13, fixed relative to the bottom 8 of the basin, arranged parallel to the same direction at a predetermined pitch, as shown diagrammatically in FIG. 5.
- the carriage 2 comprises at least one drive pinion 14 having a chain-type toothing formed by teeth 15 adapted to mesh with the fingers 13.
- the radial length of the teeth is predetermined so that the end free 16 of each tooth 15 penetrates between two adjacent fingers 13 at least to the point where the gap between said fingers 13 is the smallest.
- each tooth 15 has a radial length substantially equal to the diameter of the fingers 13.
- each pinion 14 is driven by a geared motor 18 with electronically controlled AC output, supplied with low voltage direct current, for example 12 volts.
- the gearmotors 18 are, for example, commercial gearmotors used to actuate windscreen wipers for vehicles such as public works vehicles.
- gearmotors manufactured by VALEO, which are capable of supplying a torque at five revolutions / min of 6Nm, comprising a single reduction stage consisting of a worm and a wheel.
- a geared motor supplied with 12 volts, consumes a current of 1.2A when empty and can withstand a constant maximum current of 7A.
- a gearmotor is extremely reliable, and is calculated for example for a guaranteed operating time of at least fifteen thousand hours. Being manufactured in large series, such a geared motor is also inexpensive.
- the stator of the electric motor of such a geared motor is formed of ferrites and produces a permanent magnetic field.
- the rotor has coils in which flows the current which is brought by the collector and which generates a magnetic field transforming the electrical energy into mechanical energy.
- the direction of rotation of the motor is determined by the polarity of the connection of the power supply, and the reversal of this connection causes a reversal of the direction of rotation.
- Such an engine is capable of remaining powered while being blocked, which facilitates the control of the carriage (see below).
- Each gearmotor is equipped with a revolution counter device: it is thus possible to count the revolutions in a control cabinet 46 to know at any time and precisely the position of the carriage 2 at the bottom of the basin.
- the control cabinet 46 also includes all the conventional electronic means for electronically controlling the supply of the geared motors 18 and reverse the feed direction and the direction of rotation of these at the end of the stroke.
- the carriage 2 comprises a central body 19 carrying the three drive pinions 14.
- the central body 19 is slidably mounted on two longitudinal slides 20 carried at each of their longitudinal ends 21, 22 by a support member 23 mounted on wheels 24.
- each support member 23 has two wheels
- Each support member 23 comprises means for bearing transversely on one or the other of the lateral faces 25, 26 of the guide rail 7.
- the guide rail 7 is, in the example shown, constituted by a tube 27 of square section, surmounted by a flat 28 carrying the fingers 13.
- Each support member 23 extends on either side of the square tube 27 substantially to the lower part of said tube.
- Each support member 23 has its end opposite to the central body 19 of tapered shape in plan view ( Figure 3) and in profile view ( Figure 4).
- the end face 29 of each support member 23 has an opening 30 through which the rail 7.
- the side edges 31 and 32 of the opening 30 can bear on the corresponding side face 25, 26 of the tube 27 to align if necessary the carriage 2 in the longitudinal direction 3.
- This central body 19 also has an opening 50 for the passage of the rail 7 (see FIG. 7).
- the slides 20 pass through the central body 19 on either side of the opening 50 at the level thereof.
- a compression spring 33 is mounted around each slide 20 between the central body 19 and each of the support members 23. The purpose of the springs 33 is above all to avoid an impact of the central body 19 on a support member 23 and to make progressive l 'drive force produced by the gearmotors 18 at the end of travel of the carriage 2 or in front of an obstacle.
- the transverse slurry suction pipe 4 is carried by the central body 19.
- the pipe 4 has on either side of the central body 19 two bends in opposite directions making it possible to bring the arms 4a and 4b of this tubing as close as possible to the bottom 8 of the basin.
- Chatjue arm 4a, 4b has at its free end a wheel 34 or a set of wheels for rolling on the bottom 8 of the basin.
- Each arm conventionally comprises sludge suction holes 35.
- a deflector 36 can be welded to the arm 4a, 4b between two adjacent holes 35.
- the transverse tube 4 is pivotally mounted on the central body 19.
- the tube 4 is mounted on a hollow support 37 in the form of an inverted bowl comprising, along its outer edge, a flange 38 bearing on the upper surface 39 of the central body 19.
- the hollow support 37 communicates with the tube 4 through a hole 37a.
- the flange 38 is pressed against an annular seal 40 of anti-friction material, for example Teflon (registered trademark), by spacers 41 pressed against the surface 39 by springs 42 which are each put in compression by a screw 43. It is thus possible to adjust at will the resistance opposed by this mounting to a pivoting of the suction pipe 4 relative to the central body 19 in the case where one of the arms 4a, 4b encounters an obstacle .
- Other known mounting methods can also be used.
- two suction tubes 44, 45 communicating with the interior of the hollow support 37, extend substantially vertically towards the bottom 8 of the basin and open out at the level of the guide rail 7 on either side of it (see FIG. 7).
- the carriage according to the invention is connected to the control cabinet 46 containing an automaton for controlling the movement of the carriage, by a flexible cable 47 comprising four conductors, two conductors for the supply current of the motors of the gearmotors 18, and two conductors for bringing back to the electrical cabinet 46 a signal at each revolution of the motors.
- the flexible cable 47 with four conductors is thus compact. It is preferably housed inside the flexible sludge suction pipe 6.
- a lifter is provided, shown diagrammatically at 48, for gripping the arms 4a, 4b of the suction pipe and bringing the assembly of the carriage 2 to the surface for examination or maintenance.
- the geared motors 14 are blocked.
- the intensity of the current flowing in the three motors increases up to a maximum threshold controlled by the cabinet 46.
- the cabinet 46 commands the reversal of the direction of the current to rotate the pinions 14 in the opposite direction to the previous one.
- the carriage 2 therefore departs in the opposite direction, to the right in FIGS. 1, 2, 3, 4.
- the position of the central body 19 on the slides 20 does not matter.
- the central body 19 can remain against the support member 23 with which it is in contact, which corresponds to maximum stability in the longitudinal direction.
- the intensity increases up to the aforementioned maximum threshold detected by the cabinet 46 which controls a reversal of the direction of movement of the carriage and mark, from the number of engine revolutions, the exact location of the obstacle to allow intervention on said obstacle.
- the tapered shape of the end of the support members 23 is sufficient to remove a good part of the obstacles liable to hinder the advancement of the carriage 2.
- the applicant has produced a prototype comprising a rail which is a square tube 40 mm in side carrying fingers of diameter 5 mm, arranged in a pitch of 8 mm.
- the fingers have a height of about 15 mm
- the pinions have a height of about 14 mm to mesh with the greater part of the length of the fingers 13.
- the slides 20 can have a relatively large length, for example of the about 80 or 100 cm, to give the carriage 2 excellent stability in the longitudinal direction.
- the stability of the carriage 2 in the transverse direction is ensured by the rollers 34 at the end of the arms 4a, 4b of the spiral tube 4.
- the present invention describes a carriage using a particular rack, on which meshes at least one particular pinion adapted to said rack, so as to spread or break said debris as far as possible.
- the detection of a blockage of the carriage in the electrical cabinet by monitoring a maximum intensity threshold which can be easily supported by the gearmotors driving the pinions allows extremely reliable and flexible operation of the system according to the invention. , without risk of breakage in case presence of an obstacle resistant to the force developed by the pinions.
- the electrical energy to power the gearmotors could be replaced by another source of energy, provided that means are provided to detect a resistance opposing the advancement of the carriage and to control, in such a case, a reversing the direction of travel of this carriage to avoid any risk of breaking or simply deforming an element constituting the drive kinematic chain of the carriage.
- At least one slide 20 is required, and at least one spring 33 mounted between the central body 19 and each support member 23.
- the embodiment described above is perfectly suited to a modular embodiment. It is possible to mount several central bodies 19 which may or may not be identical, on the same set of slides of great length, to drive a tube of great length adapted to a very large settling tank.
- the central body 19 is advantageously filled with resin to drown the geared motors 18.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Transmission Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9608182 | 1996-07-01 | ||
FR9608182A FR2750345B1 (en) | 1996-07-01 | 1996-07-01 | SYSTEM FOR SUCTION OF SLUDGE AT THE BOTTOM OF A DECANTING BASIN |
PCT/FR1997/001158 WO1998000217A1 (en) | 1996-07-01 | 1997-06-27 | System for sucking sludge at the bottom of a sedimentation pond |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0912222A1 true EP0912222A1 (en) | 1999-05-06 |
Family
ID=9493604
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97931829A Withdrawn EP0912222A1 (en) | 1996-07-01 | 1997-06-27 | System for sucking sludge at the bottom of a sedimentation pond |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0912222A1 (en) |
FR (1) | FR2750345B1 (en) |
WO (1) | WO1998000217A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2391018B1 (en) * | 2010-03-01 | 2013-10-17 | Serveis Barmatec, S.L | DEVICE FOR MOVING A FRAME OF SOLIDS OR FOAMS FROM A SEDIMENTATION TANK AND SEDIMENTATION TANK THAT INCLUDES SUCH DEVICE |
CN110844986B (en) * | 2019-11-12 | 2023-11-17 | 苏州仕净科技股份有限公司 | Waste water treatment device with rapid treatment function |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3524485A (en) * | 1968-08-05 | 1970-08-18 | Morbark Ind Inc | Log chipping apparatus |
DE2723062C2 (en) * | 1977-05-21 | 1979-03-01 | Lechler Gmbh & Co Kg, 7012 Fellbach | Mechanical adjustment device for adjustment carriages, in particular on machine tools |
US4401576A (en) * | 1980-12-29 | 1983-08-30 | Meurer Industries, Inc. | Sediment collecting device |
-
1996
- 1996-07-01 FR FR9608182A patent/FR2750345B1/en not_active Expired - Fee Related
-
1997
- 1997-06-27 EP EP97931829A patent/EP0912222A1/en not_active Withdrawn
- 1997-06-27 WO PCT/FR1997/001158 patent/WO1998000217A1/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9800217A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2750345B1 (en) | 1998-09-04 |
WO1998000217A1 (en) | 1998-01-08 |
FR2750345A1 (en) | 1998-01-02 |
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Legal Events
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STAA | Information on the status of an ep patent application or granted ep patent |
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18D | Application deemed to be withdrawn |
Effective date: 20010413 |