CN115869665A - Underwater mud scraper for sedimentation tank - Google Patents
Underwater mud scraper for sedimentation tank Download PDFInfo
- Publication number
- CN115869665A CN115869665A CN202211629349.2A CN202211629349A CN115869665A CN 115869665 A CN115869665 A CN 115869665A CN 202211629349 A CN202211629349 A CN 202211629349A CN 115869665 A CN115869665 A CN 115869665A
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- China
- Prior art keywords
- frame
- rotating
- mud
- sedimentation tank
- screening
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- 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.)
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- 238000004062 sedimentation Methods 0.000 title claims abstract description 34
- 238000012216 screening Methods 0.000 claims abstract description 33
- 238000007790 scraping Methods 0.000 claims abstract description 29
- 238000011084 recovery Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 5
- 239000013013 elastic material Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 2
- 239000010802 sludge Substances 0.000 abstract description 10
- 239000012535 impurity Substances 0.000 description 13
- 238000004064 recycling Methods 0.000 description 8
- 238000005086 pumping Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Removal Of Floating Material (AREA)
Abstract
The invention discloses an underwater mud scraper for a sedimentation tank, which relates to the technical field of mud scrapers and comprises the following components: the moving tracks are distributed on the edges of two sides of the tank body; the movable base is connected with the output end of the movable track, the output end of the movable base extends into the tank body, and the sludge scraping box is installed on the movable base; scrape one side of mud case and install the recovery area of intercommunication, and scrape mud case and include: the box body is internally provided with a plurality of obliquely arranged screening frames; the link, it is a plurality of the outside of link all rotates and is connected with the rotating band, and each link all installs between adjacent screening frame through coil spring. Compared with the prior art, the scraper is provided with the plurality of rotatable rotating belts, so that the contact quality with the bottom of the sedimentation tank can be improved, and when the bottom of the sedimentation tank is uneven, the rotating belts at the corresponding parts can be attached under the driving of the spiral spring, so that the mud scraping quality can be improved.
Description
Technical Field
The invention relates to the technical field of mud scrapers, in particular to an underwater mud scraper for a sedimentation tank.
Background
After the sedimentation tank is used for a certain time, sludge or other sediments can be settled at the bottom of the sedimentation tank, so that the interior of the sedimentation tank needs to be cleaned regularly.
Through search, chinese patent (publication number: CN 109045780A) discloses a reciprocating type sedimentation tank underwater mud scraper, which comprises a wedge-shaped mud scraper, wherein a groove is formed on the lower surface of the wedge-shaped mud scraper, and a plurality of scraping strips protruding out of the lower surface of the mud scraper are arranged on the lower surface of the mud scraper.
In prior art, when the scraping strip of mud scraper contacted with the bottom of sedimentation tank, if the bottom unevenness of sedimentation tank, then the contact quality of scraping strip and sedimentation tank was relatively poor, led to the effect of scraping mud relatively poor.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an underwater mud scraper for a sedimentation tank.
In order to realize the purpose, the invention provides the following technical scheme: a sedimentation tank underwater mud scraper comprises moving tracks and a moving base, wherein the moving tracks and the moving base are arranged on the edges of two sides of a tank body, and two ends of the moving base are respectively connected with the output ends of two groups of moving tracks;
the mud scraping box is arranged at the output end of the movable base, and a communicated recovery belt is arranged on one side of the mud scraping box away from the moving direction of the movable base;
the mud scraping box comprises a box body, a plurality of obliquely arranged screening frames are arranged in the box body, and connecting frames are arranged between every two adjacent screening frames through spiral springs; one end of the connecting frame, which is far away from the moving direction of the moving base, is crossed with the screening frame on the basis of the spiral spring, and the crossed end of the connecting frame is lower than the height of the screening frame;
the outer side of each connecting frame is rotatably connected with a rotating belt; one end of the rotating belt moving towards the moving base is in contact with the sedimentation tank based on the moving base;
the bottom end of the screening frame is provided with an elastic block positioned between the adjacent connecting frames, and the elastic block is used for a gap between the adjacent connecting frames;
the rotating belt, the connecting frame and the elastic blocks filter the sludge or impurities through the screening frames and then recycle the sludge or impurities into the recycling bag.
Furthermore, a recycling box is installed at one end of the moving base, and two ends of the recycling box are also connected with the output ends of the two groups of moving tracks and used for synchronously moving with the moving base;
the lower surface mounting of collection box has adjustment mechanism, adjustment mechanism's output is installed the circulation frame, separating mechanism is installed to the bottom of circulation frame, separating mechanism's output extends to in the clearance of each adjacent screening frame.
Furthermore, the adjusting mechanism comprises a first rotating motor connected with the recovery box, the output end of the first rotating motor is provided with a second air cylinder, and the output end of the second air cylinder is connected with the circulating frame;
the circulating frame is separated from each screening frame in the mud scraping box based on the second pneumatic drive separation mechanism.
Furthermore, the separating mechanism comprises a second rotating motor connected with the circulating frame, a roller body is mounted at the output end of the second rotating motor, and one end, far away from the second rotating motor, of the roller body is rotatably connected with the circulating frame;
a plurality of connecting rods distributed in multiple rows are arranged on the outer side of the roller body;
one end of each connecting rod is rotatably connected with a first rotating frame, and one end of each first rotating frame is rotatably connected with a second rotating frame;
the rotation parts of the connecting rod, the first rotating frame and the second rotating frame are provided with limiting blocks for limiting the rotation angles of the first rotating frame and the second rotating frame.
Further, a pumping mechanism is arranged in the circulating frame, and a water inlet of the pumping mechanism extends to the interior of the pool body;
the expansion pieces extending into the first rotating frame and the second rotating frame are arranged in the connecting rod, and each expansion piece is connected with the output end of the pumping mechanism;
after the expansion piece expands, the connecting rod and the second rotating frame are driven to rotate, and a hook shape is formed between the connecting rod and the connecting rod.
Furthermore, the movable base comprises a driving seat connected with the movable rail, a plurality of first air cylinders are installed inside the driving seat, and vertical lifting frames are installed among output ends of the first air cylinders;
the mud scraping box is connected with the output end of the vertical lifting frame.
Furthermore, side wing plates are arranged on two sides of the box body;
the side wing plates incline towards the upper side of the moving direction of the moving base in the vertical direction;
and the side wing plates incline towards the outer side of the box body in the horizontal direction.
Furthermore, the elastic block is made of elastic materials, and the inclination angle of one end, far away from the screening frame, of the elastic block is the same as that of the connecting frame;
one end of the elastic block facing the screening frame is provided with an upward-tilted arc part.
Furthermore, the circulating frame comprises an assembling frame connected with the adjusting mechanism, and a plurality of circulating belts distributed side by side are installed in the assembling frame;
a plurality of driving rollers and supporting rollers which are coaxially distributed are arranged among the circulating belts;
gaps are formed in one ends, facing the separating mechanism, of the circulating frames and are used for the connecting rods in each row in the separating mechanism to pass through when rotating;
and a plurality of protruding blocks are arranged on the outer side of each circulating belt.
Compared with the prior art, the invention has the following beneficial effects:
compared with the prior art, the scraper is provided with the plurality of rotatable rotating belts, so that the contact quality with the bottom of the sedimentation tank can be improved, and when the bottom of the sedimentation tank is uneven, the rotating belts at the corresponding parts can be attached under the driving of the spiral spring, so that the mud scraping quality can be improved;
elastic blocks for filling joints are further arranged among the rotating belts and used for reducing dead angles among the rotating belts, so that the mud scraping quality is further improved;
on the other hand, the invention can screen larger impurities in the sludge through the screening frame, and the larger impurities are recycled to the recycling box through the separating mechanism and the circulating frame; wherein, first rotating turret and second rotating turret between the separating mechanism can and the connecting rod between form the hook type under the expanded state of inflation piece to conveniently clear up the impurity between each screening frame, and the inflation piece is rotatory to the one side of circulation frame after, the disconnection supply, first rotating turret and second rotating turret can be rotatory under the effect of external force, thereby shift impurity to the inside of circulation frame.
Drawings
FIG. 1 is a schematic view of a sedimentation tank underwater mud scraper;
FIG. 2 is a partial top cross-sectional view of the mud scraping box of the present invention;
FIG. 3 is a partial cross-sectional view of a mud scraping box according to the present invention;
FIG. 4 is a partial cross-sectional view of the release mechanism of the present invention;
FIG. 5 is a partial top cross-sectional view of the cycle frame of the present invention;
1. a tank body; 2. a moving track; 3. a movable base; 4. a mud scraping box; 5. recovering the belt; 6. a recycling bin; 7. an adjustment mechanism; 8. a circulating frame; 9. a separating mechanism; 31. a driving seat; 32. a first cylinder; 33. a vertical lifting frame; 41. a box body; 42. a rotating belt; 43. a screening frame; 44. a connecting frame; 45. an elastic block; 46. a side wing panel; 91. a connecting rod; 92. a first rotating frame; 93. a second rotating frame; 94. a limiting block; 95. an expansion member; 81. assembling a frame; 82. a circulating belt; 83. and (4) a protruding block.
Detailed Description
Referring to fig. 1 to 5, a mud scraper under water of a sedimentation tank comprises a movable track 2 and a movable base 3 which are arranged at the edges of two sides of a tank body 1, wherein two ends of the movable base 3 are respectively connected with the output ends of two groups of movable tracks 2;
the output end of the movable base 3 is provided with a mud scraping box 4, and one side of the mud scraping box 4 away from the moving direction of the movable base 3 is provided with a communicated recovery belt 5;
the mud scraping box 4 comprises a box body 41, a plurality of obliquely arranged screening frames 43 are arranged in the box body 41, and connecting frames 44 are arranged between every two adjacent screening frames 43 through spiral springs; one end of the connecting frame 44 far away from the moving direction of the moving base 3 is crossed with the sieving frame 43 based on a spiral spring, and the crossed end of the connecting frame 44 is lower than the height of the sieving frame 43;
the outer side of each connecting frame 44 is rotatably connected with a rotating belt 42; one end of the rotating belt 42 moving toward the moving base 3 is brought into contact with the sedimentation tank based on the moving base 3;
the bottom end of the screening frame 43 is provided with an elastic block 45 positioned between the adjacent connecting frames 44, and the elastic block 45 is used for a gap between the adjacent connecting frames 44;
the rotating belt 42, the connecting frame 44 and the elastic block 45 filter the sludge or the foreign substances through the respective sieving frames 43 and then recover the sludge or the foreign substances into the recovery belt 5.
A recycling box 6 is arranged at one end of the movable base 3, and two ends of the recycling box 6 are also connected with the output ends of the two groups of movable rails 2 and used for synchronously moving with the movable base 3;
the lower surface mounting of collection box 6 has adjustment mechanism 7, and adjustment mechanism 7's output is installed and is circulated frame 8, and separating mechanism 9 is installed to the bottom of circulation frame 8, and the internally mounted of circulation frame 8 has pumping mechanism, and pumping mechanism's water inlet extends to the inside of cell body 1, and separating mechanism 9's output extends to in the clearance of each adjacent screening frame 43.
The adjusting mechanism 7 comprises a first rotating motor connected with the recycling bin 6, a second air cylinder is mounted at the output end of the first rotating motor, and the output end of the second air cylinder is connected with the circulating frame 8;
the circulation frame 8 is separated from each of the sieving frames 43 in the mud scraping box 4 based on the second pneumatic drive separating mechanism 9, and is rotated by the first rotating motor so as to avoid contact with the mud scraping box 4 when it is lifted along the moving base 3.
The separating mechanism 9 comprises a second rotating motor connected with the circulating frame 8, the output end of the second rotating motor is provided with a roller body, and one end of the roller body, which is far away from the second rotating motor, is rotatably connected with the circulating frame 8;
a plurality of connecting rods 91 distributed in a plurality of rows are installed on the outer side of the roller body.
The movable base 3 comprises a driving seat 31 connected with the movable rail 2, a plurality of first air cylinders 32 are arranged in the driving seat 31, a vertical lifting frame 33 is arranged between the output ends of the first air cylinders 32, and the vertical lifting frame 33 comprises a screw rod driving mechanism;
the mud scraping box 4 is connected with the output end of the screw rod driving mechanism in the vertical lifting frame 33.
Referring to fig. 2 to 3, side wings 46 are installed on both sides of the case 41;
the flanks 46 are inclined in the vertical direction toward the upper side of the moving direction of the moving base 3;
and the side wing plates 46 are inclined toward the outside of the case 41 in the horizontal direction;
by providing two sets of inclined directions, water, sludge and impurities in the sedimentation tank are gathered in the direction of the tank 41 when the tank 41 moves.
The elastic block 45 is made of elastic materials, and the inclination angle of one end, far away from the screening frame 43, of the elastic block 45 is the same as that of the connecting frame 44;
one end of the elastic block 45 facing the screening frame 43 is provided with an arc part which is tilted upwards.
Referring to fig. 4, one end of each connecting rod 91 is rotatably connected to a first rotating frame 92, and one end of the first rotating frame 92 is rotatably connected to a second rotating frame 93;
the rotation positions of the connecting rod 91, the first rotating frame 92 and the second rotating frame 93 are all provided with a limiting block 94 for limiting the rotation angles of the first rotating frame 92 and the second rotating frame 93.
The connecting rod 91 is internally provided with expansion pieces 95 which extend into the first rotating frame 92 and the second rotating frame 93, and each expansion piece 95 is connected with the output end of the pumping mechanism;
after the expansion piece 95 expands, the connection rod 91 and the second rotating frame 93 are driven to rotate, and a hook shape is formed between the connection rod 91 and the expansion piece.
Referring to fig. 5, the circulation frame 8 includes an assembly frame 81 connected to the adjustment mechanism 7, and a plurality of circulation belts 82 distributed side by side are installed inside the assembly frame 81;
a plurality of driving rollers and supporting rollers which are coaxially distributed are arranged among the circulating belts 82;
gaps are arranged at one ends of the plurality of circulating frames 8 facing the separating mechanism 9 and are used for the connecting rods 91 in each row in the separating mechanism 9 to pass through when rotating;
a plurality of projecting blocks 83 are provided on the outer side of each endless belt 82.
The working principle is as follows:
in use, the mud scraping box 4 descends to the bottom of the sedimentation tank along the vertical lifting frame 33 in the mobile base 3, and the connecting frame 44 in the mud scraping box 4 and the rotating belt 42 outside the connecting frame are in contact with the bottom of the sedimentation tank;
subsequently, the adjusting mechanism 7 is started, the separating mechanism 9 is moved to the upper side of the sludge scraping box 4, and a plurality of rows of connecting rods 91 are inserted between the respective screening frames 43 in the sludge scraping box 4;
then, the movable track 2 is started, the mud scraping box 4 is moved along the bottom of the sedimentation tank, the connecting frame 44 is tightly attached to the upper side of the bottom of the sedimentation tank under the driving of a spiral spring, and the mud enters the box body 41 through the rotating belt 42, is filtered by each screening frame 43 and then moves into the recovery belt 5;
and simultaneously starting a second rotating motor in the separating mechanism 9 to drive each connecting rod 91 to rotate, filling water into the expansion piece 95 inside the corresponding connecting rod 91 when the corresponding connecting rod 91 passes through the screening frame 43, forming a hook shape between the first rotating frame 92 and the second rotating frame 93 and the corresponding connecting rod 91, hooking impurities on each screening frame 43, moving the impurities to the upper side of the circulating frame 8 along with the rotation, cutting off the supply of the expansion piece 95, contacting the impurities with the convex blocks 83 on the outer side of the impurities when the impurities pass through each circulating belt 82 in the circulating frame 8 until the first rotating frame 92 and the second rotating frame 93 are bent and separated from the circulating frames, and then moving the impurities into the recovery box 6 along with the circulating belts 82 and falling into the recovery box 6 when the corresponding part of the circulating belt 82 rotates to the lower side.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the present template may occur to those of ordinary skill in the art without departing from the principles of the present invention.
Claims (8)
1. The utility model provides a sedimentation tank mud scraper under water which characterized in that includes:
the moving tracks (2) are distributed on the edges of two sides of the tank body (1);
the movable base (3) is connected with the output end of the movable track (2), the output end of the movable base (3) extends into the tank body (1), and the output end of the movable base (3) is provided with a mud scraping box (4);
scrape one side of mud case (4) and install recovery area (5) of intercommunication, and scrape mud case (4) and include:
the screening device comprises a box body (41), wherein a plurality of obliquely arranged screening frames (43) are arranged in the box body (41);
the outer sides of the connecting frames (44) are rotatably connected with rotating belts (42), and each connecting frame (44) is arranged between the adjacent screening frames (43) through a spiral spring;
each connecting frame (44) is distributed with the screening frame (43) in a cross way;
and a plurality of elastic blocks (45), wherein the elastic blocks (45) are connected with the screening frames (43) and are used for filling gaps between adjacent connecting frames (44).
2. A sedimentation basin underwater dredge according to claim 1 characterized in that one end of the mobile base (3) is fitted with a recovery tank (6) moving synchronously;
the lower surface mounting of collection box (6) has adjustment mechanism (7), circulation frame (8) are installed to the output of adjustment mechanism (7), separating mechanism (9) are installed to the bottom of circulation frame (8), the output of separating mechanism (9) extends to in the clearance of each adjacent screening frame (43).
3. A sedimentation tank underwater dredge according to claim 2, characterized in that the separation mechanism (9) comprises a plurality of connecting rods (91), a plurality of said connecting rods (91) are arranged in a plurality of rows and circulate through between the corresponding screening frames (43);
one end of each connecting rod (91) is rotatably connected with a first rotating frame (92), and one end of each first rotating frame (92) is rotatably connected with a second rotating frame (93);
and the rotating parts of the connecting rod (91), the first rotating frame (92) and the second rotating frame (93) are provided with limiting blocks (94) for limiting the rotating angle.
4. A sedimentation basin underwater dredge according to claim 3, characterized in that the connecting rod (91) is internally provided with an expansion member (95) extending to the inside of the first rotating frame (92) and the second rotating frame (93);
after the expansion piece (95) expands, the connecting rod (91) and the second rotating frame (93) are driven to rotate, and hook shapes are formed among the connecting rod (91), the second rotating frame (93) and the connecting rod (91).
5. A sedimentation tank underwater mud scraper in accordance with claim 1, characterized in that the moving base (3) comprises a driving seat (31) connected with the moving rail (2), a plurality of first air cylinders (32) are installed inside the driving seat (31), and a vertical lifting frame (33) is installed between the output ends of the plurality of first air cylinders (32);
the mud scraping box (4) is connected with the output end of the vertical lifting frame (33).
6. The underwater mud scraper of the sedimentation tank as claimed in claim 1, wherein the elastic block (45) is made of an elastic material, and the inclination angle of one end of the elastic block (45) far away from the sieving frame (43) is the same as that of the connecting frame (44);
one end of the elastic block (45) facing the screening frame (43) is provided with an upward-tilted arc part.
7. A sedimentation tank underwater mud scraper according to claim 4, characterized in that the circulating frame (8) comprises an assembling frame (81) connected with the adjusting mechanism (7), and a plurality of circulating belts (82) distributed side by side are installed inside the assembling frame (81);
gaps are arranged at one ends of the plurality of circulating frames (8) facing the separating mechanism (9).
8. A sedimentation basin underwater dredge in accordance with claim 7, characterized in that the outer side of each of the endless belts (82) is provided with a plurality of projecting blocks (83).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211629349.2A CN115869665B (en) | 2022-12-19 | 2022-12-19 | Sedimentation tank is mud scraper under water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211629349.2A CN115869665B (en) | 2022-12-19 | 2022-12-19 | Sedimentation tank is mud scraper under water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115869665A true CN115869665A (en) | 2023-03-31 |
| CN115869665B CN115869665B (en) | 2024-02-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211629349.2A Active CN115869665B (en) | 2022-12-19 | 2022-12-19 | Sedimentation tank is mud scraper under water |
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| Country | Link |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007204965A (en) * | 2006-01-31 | 2007-08-16 | Utsunomiya Kogyo Kk | Screen |
| CN201304267Y (en) * | 2008-09-19 | 2009-09-09 | 刘家池 | Sandy water purifier |
| JP2010036143A (en) * | 2008-08-07 | 2010-02-18 | Panasonic Corp | Solid/liquid separator |
| CN208440340U (en) * | 2018-04-23 | 2019-01-29 | 嘉兴市锦福缩染有限公司 | Mud-scraping apparatus for sedimentation basin |
| CN208927684U (en) * | 2018-09-05 | 2019-06-04 | 嘉兴市天伦纳米染整有限公司 | A kind of sedimentation basin mud scraper |
| CN209885305U (en) * | 2019-03-31 | 2020-01-03 | 江苏工大环保有限公司 | Novel amplitude-flow type mud scraper |
| CN211752731U (en) * | 2019-12-31 | 2020-10-27 | 安徽恒帆环保科技有限公司 | Multifunctional truss suction dredger |
-
2022
- 2022-12-19 CN CN202211629349.2A patent/CN115869665B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007204965A (en) * | 2006-01-31 | 2007-08-16 | Utsunomiya Kogyo Kk | Screen |
| JP2010036143A (en) * | 2008-08-07 | 2010-02-18 | Panasonic Corp | Solid/liquid separator |
| CN201304267Y (en) * | 2008-09-19 | 2009-09-09 | 刘家池 | Sandy water purifier |
| CN208440340U (en) * | 2018-04-23 | 2019-01-29 | 嘉兴市锦福缩染有限公司 | Mud-scraping apparatus for sedimentation basin |
| CN208927684U (en) * | 2018-09-05 | 2019-06-04 | 嘉兴市天伦纳米染整有限公司 | A kind of sedimentation basin mud scraper |
| CN209885305U (en) * | 2019-03-31 | 2020-01-03 | 江苏工大环保有限公司 | Novel amplitude-flow type mud scraper |
| CN211752731U (en) * | 2019-12-31 | 2020-10-27 | 安徽恒帆环保科技有限公司 | Multifunctional truss suction dredger |
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| CN115869665B (en) | 2024-02-13 |
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