CN213162159U - Automatic cleaning robot for photovoltaic panel - Google Patents
Automatic cleaning robot for photovoltaic panel Download PDFInfo
- Publication number
- CN213162159U CN213162159U CN202021997009.1U CN202021997009U CN213162159U CN 213162159 U CN213162159 U CN 213162159U CN 202021997009 U CN202021997009 U CN 202021997009U CN 213162159 U CN213162159 U CN 213162159U
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- 238000004140 cleaning Methods 0.000 title claims abstract description 112
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 69
- 239000007921 spray Substances 0.000 claims abstract description 36
- 238000001514 detection method Methods 0.000 claims description 16
- 238000004891 communication Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 238000002791 soaking Methods 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 description 8
- 239000012535 impurity Substances 0.000 description 7
- 239000000428 dust Substances 0.000 description 5
- 238000005507 spraying Methods 0.000 description 4
- 210000003608 fece Anatomy 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Photovoltaic Devices (AREA)
- Cleaning In General (AREA)
Abstract
The utility model discloses an automatic cleaning robot of photovoltaic electroplax, including the frame, locate a pair of walking track and the clean subassembly of frame, clean subassembly includes cleaning brush, water tank, water pump and spray pipe that connect gradually with the water tank, and the preceding tip of frame is violently located to the spray pipe, and a plurality of water jets have been seted up along its length direction on the surface to the spray pipe lower part, but cleaning brush luffing motion ground is installed in the back tip of frame, and cleaning brush includes a plurality of horizontal arc brush that set up side by side. The utility model discloses, the spray pipe violently locates the preceding tip of frame, and the cleaning brush setting is at the back tip of frame, and the spray pipe is behind the preceding tip blowout water of frame, and the cleaning brush of tip can not clean just spun water and photovoltaic electroplax behind the frame, and spun water has longer soaking, softening time to the spot on the photovoltaic electroplax, and the spot softening degree on the photovoltaic electroplax is higher, changes and is clear away to can make the clean effect of photovoltaic electroplax better.
Description
Technical Field
The utility model relates to a cleaning device field especially relates to an automatic cleaning robot of photovoltaic electroplax.
Background
Photovoltaic power generation is a technology for directly converting light energy into electric energy by utilizing the photovoltaic effect of a semiconductor interface, and mainly comprises a photovoltaic panel (also called as a solar panel), a controller and an inverter. Photovoltaic power generation's operating characteristic has decided that the photovoltaic electroplax must be laid outdoors, outdoor environment causes the pollution of dust, other impurity in bird excrement and the air can not avoided on photovoltaic electroplax surface, deposit dust or other impurity back on the photovoltaic electroplax, impurity and rainwater mix can form the large scale dirt, impurity and rainwater mixed large scale dirt and bird excrement, the efficiency of solar panel is then influenced to light, the heavy hot spot that then forms, damage the photovoltaic electroplax, and lead to whole array unable work. In order to solve the problems, the surface of the photovoltaic panel needs to be cleaned in time, most of the existing photovoltaic panels are cleaned manually, the efficiency is low, the photovoltaic panel cannot be cleaned at any time and any place, the timeliness is poor, and the photovoltaic panel is easy to damage when people step on the photovoltaic panel; along with intelligent popularization, a few robots that clean to the photovoltaic electroplax have appeared, and these robots adopt brush and vacuum chuck's mode to clean basically, and some dust and impurity that viscidity is less can effectively be clear away to this kind of mode, to the great impurity of viscidity like the big dirt that bird's dung or impurity, rainwater mix formation, it then can't carry out effectual cleaing away, and clean effect is relatively poor.
Disclosure of Invention
An object of the utility model is to provide an automatic cleaning robot of photovoltaic electroplax.
Realize the utility model discloses the technical scheme of purpose is: the utility model provides an automatic cleaning machines people of photovoltaic electroplax, which comprises a frame, locate a pair of walking track and the clean subassembly of frame, the bottom of the double-phase offside of frame is located to a pair of walking track, clean subassembly includes the cleaning brush, the water tank, water pump and spray pipe that connect gradually with the water tank, water tank and water pump are installed in the frame, the preceding tip of frame is violently located to the spray pipe, a plurality of water jets have been seted up along its length direction on the surface to the spray pipe lower part, but the cleaning brush luffing motion ground is installed in the rear end portion of frame, the cleaning brush includes a plurality of arc sub-brushes that transversely set up side by side, the arc center of every arc sub-brush is located one side that the arc sub-brush is close to the frame, the mounting height of arc sub.
Further, the cleaning brush has a lateral width greater than that of the water spray pipe. This setting to the place that has water stain on can spouting the face to be cleaned to the spray pipe can be cleaned to the cleaning brush, once only all can clean.
Furthermore, an exhaust fan is installed on the machine frame. The rack is also usually provided with a power mechanism for driving the walking track, such as a motor, a control panel and the like, when the rack works, the temperature in the rack is relatively high, and the rack can be cooled and cooled by the installation of the exhaust fan. The exhaust fan is typically mounted at the rear end of the chassis.
Furthermore, the frame is internally provided with a detection unit and a control unit, the detection unit, the walking track power mechanism, the water pump of the cleaning assembly and the cleaning brush up-and-down swinging power mechanism are respectively in communication connection with the control unit, the detection unit is used for feeding back the position information of the automatic cleaning robot of the photovoltaic electroplax, and the control unit is used for receiving the information fed back by the detection unit, controlling the walking path of the walking track and controlling the cleaning action of the cleaning assembly. Specifically, the control unit controls the cleaning action of the cleaning assembly, namely whether a water pump of the cleaning assembly is started or not, whether a water spraying pipe sprays water or not and whether a cleaning brush swings downwards or not, so that the cleaning brush can contact with a plate surface to be cleaned for cleaning. This arrangement makes the robot cleaner more intelligent.
Further, the detection unit includes an infrared distance measurement sensor, a gyroscope, and an inclination sensor. The infrared distance measuring sensor is used for detecting the moving position of the robot in real time, and the gyroscope and the inclination angle sensor are used for feeding back the moving direction and the angle of the robot. This setting can accurate feedback robot's position and motion state, makes things convenient for the control unit control walking track to walk according to the walking route of regularization, judges whether clean subassembly treats that the clean face cleans.
Furthermore, the detection unit also comprises an infrared camera which is arranged at the front end part of the frame transversely arranged on the water spraying pipe. The infrared camera is used for shooting photovoltaic electroplax and environmental information, makes things convenient for the backstage to model to monitor the position of robot, simultaneously, the infrared camera still is used for the status information of real-time detection photovoltaic electroplax, for example whether photovoltaic electroplax is clean, whether have the stain on it, if detect the stain that has on the photovoltaic electroplax, the control unit can plan the moving route of robot, makes the robot can be to the targeted clearance of stain on the photovoltaic electroplax.
Further, the detection unit further includes a photosensor. Photoelectric sensor is used for real-time response environment light, makes things convenient for the control unit to judge whether daytime or evening, carries out according to judging the structure, control walking track and clean subassembly to whether control robot removes and clean, the during operation, for the influence of the removal of avoiding the robot and clean to photovoltaic board electricity generation, only clean evening usually, detect when evening at photoelectric sensor promptly, the removal and the cleanness of robot just can be controlled to the control unit.
Furthermore, the control unit comprises a single chip microcomputer and a PLC which are in communication connection, the detection unit is connected with the single chip microcomputer, and the walking track power mechanism, the water pump of the cleaning assembly and the cleaning brush up-and-down swinging power mechanism are respectively in communication connection with the PLC of the control unit. The single chip microcomputer controls the walking crawler power mechanism, the water pump of the cleaning assembly and the cleaning brush up-and-down swinging power mechanism through the PLC.
The utility model discloses photovoltaic electroplax's self-cleaning robot adopts through the water spray and the dual structure who cleans, comes to clean photovoltaic electroplax, compares and has now to sweep futilely, the utility model discloses spraying water before cleaning, on the one hand, the wind of reducible dust is scattered and falls on photovoltaic electroplax again, and on the other hand, water can make the spot soften, especially like some bird droppings, large-scale hot spot etc. in the soft back of water, changes and clears away. And, the utility model discloses more critical is, the spray pipe violently locates the preceding tip of frame, and the cleaning brush setting is at the rear end of frame, and the spray pipe is behind the preceding tip blowout water of frame, and the cleaning brush of tip can not clean just spun water and photovoltaic electroplax behind the frame, and spun water has longer soaking, softening time to the spot on the photovoltaic electroplax, compares spray pipe and cleaning brush and sets up the preceding tip in the frame simultaneously, the utility model discloses the spot on the photovoltaic electroplax softens the degree higher, changes and is clear away to can make the clean effect of photovoltaic electroplax better.
Drawings
Fig. 1 is a schematic perspective view of an automatic cleaning robot for photovoltaic panels according to the present invention at a first viewing angle;
fig. 2 is a schematic perspective view of the automatic cleaning robot for photovoltaic panels according to the present invention at a second viewing angle;
FIG. 3 is a schematic structural view of the photovoltaic panel of the present invention after the front panel of the upper panel of the robot frame is removed;
fig. 4 is a functional block diagram of the automatic cleaning robot for photovoltaic panels of the present invention.
Detailed Description
The following detailed description of the embodiments of the automatic cleaning robot for photovoltaic panels according to the present invention is made with reference to the accompanying drawings:
as shown in fig. 1 to 3, an automatic cleaning robot for photovoltaic panels includes a frame 10, a pair of walking tracks 1 and a cleaning assembly 2 disposed on the frame 10, the pair of walking tracks 1 are disposed on the bottom of two opposite sides of the frame 10, the cleaning assembly 2 includes a cleaning brush 24, a water tank 21, a water pump 22 and a water spray pipe 23 sequentially connected to the water tank 21, the water tank 21 and the water pump 22 are installed in the frame 10, the water spray pipe 23 is transversely disposed on the front end portion of the frame 10, a plurality of water spray nozzles 231 are disposed on the surface of the lower portion of the water spray pipe 23 along the length direction thereof, the cleaning brush 24 is installed at the rear end portion of the frame 10 in a vertically swinging manner, the cleaning brush 24 includes a plurality of arc sub-brushes 241 disposed side by side, the arc center P of each arc sub-brush 241 is located on one side of the arc sub-brush 241 close to the frame 10, and the installation height of the arc sub-.
The utility model discloses photovoltaic electroplax's self-cleaning robot, walking track 1 realizes the removal of robot as the running gear of robot. When the photovoltaic electroplax is laid, have angle of inclination about 5 usually, walking track 1 compares other running gear like the gyro wheel, and its surface is crude, and is big with the contact surface of panel, and the frictional force with the panel is bigger, and climbing ability is stronger, more is fit for moving on the photovoltaic electroplax.
The utility model discloses automatic cleaning robot of photovoltaic electroplax, when cleaning, the robot usually moves from top to bottom on the photovoltaic electroplax, along the incline direction, and in the moving process, water pump 22 is opened, and the water in the water tank 21 is spouted by each water jet 231 on the spray pipe 23 of frame 10 front end, and is spouted to the photovoltaic electroplax; meanwhile, the cleaning brush 24 at the rear end of the rack 10 swings downwards, the arc-shaped sub-brush 241 of the cleaning brush 24 contacts the board surface of the photovoltaic panel, the cleaning brush 24 cleans the photovoltaic panel sprayed with water along with the walking of the robot, and the cleaned stains flow downwards along the inclined photovoltaic panel and finally flow out of the photovoltaic panel.
The utility model discloses photovoltaic electroplax's self-cleaning robot, the robot usually on the photovoltaic electroplax, when from top to bottom removing along the incline direction, just can clean, and during from bottom to top removing, the cleaning operation is not done to the switching of water pump 22, the 24 upper pendulums of cleaning brush.
The utility model discloses photovoltaic electroplax's self-cleaning robot adopts through the water spray and the dual structure who cleans, comes to clean photovoltaic electroplax, compares and has now to sweep futilely, the utility model discloses spraying water before cleaning, on the one hand, the wind of reducible dust is scattered and falls on photovoltaic electroplax again, and on the other hand, water can make the spot soften, especially like some bird droppings, large-scale hot spot etc. in the soft back of water, changes and clears away. And, the utility model discloses more critical, the spray pipe 23 is violently established in the preceding tip of frame 10, and cleaning brush 24 sets up the rear end portion at frame 10, and spray pipe 23 is behind the preceding tip blowout water of frame 10, and the cleaning brush 24 of tip can not clean just spun water and electricity volt electroplax behind frame 10 in the setting, and spun water has longer soaking, the softening time to the spot on the electricity volt electroplax, compares spray pipe 23 and cleaning brush 24 and sets up the preceding tip in frame 10 simultaneously, the utility model discloses spot softening degree on the electricity volt electroplax is higher, changes and is clear away to can make the clean effect of electricity volt electroplax better.
The utility model discloses photovoltaic electroplax's self-cleaning robot, simple structure, the sewage that clean used need not to collect.
The utility model discloses photovoltaic electroplax's self-cleaning robot, cleaning brush 24 include a plurality of arc sub-brushes 241 that transversely set up side by side, and arc sub-brush 241 can make spot and the sewage of cleaing away on the photovoltaic electroplax concentrate and draw close, and can not spread the outside of cleaning brush 24, ensure that spot and sewage all can be swept out the photovoltaic electroplax downwards by arc sub-brush 241.
The utility model discloses photovoltaic electroplax's self-cleaning robot, all arc sub-brushes 241 of cleaning brush 24 are all installed in a pivot usually, and the pivot is rotatable under the drive of 24 luffing motion power unit (like the motor) of cleaning brush, and the pivoted pivot can drive all arc sub-brushes 241 of cleaning brush 24 and realize the swing. Because the swing structure belongs to the conventional structure, the utility model discloses do not do too much explanation.
The utility model discloses photovoltaic electroplax's self-cleaning robot, preferably, cleaning brush 24's transverse width is greater than spray pipe 23's transverse width. The arrangement is convenient for the cleaning brush 24 to spray the water spray pipe 23 to the place with water stain on the surface of the board to be cleaned, and all the water spray pipe can be cleaned at one time.
The utility model discloses photovoltaic electroplax's self-cleaning robot, preferably, install exhaust fan 101 on the frame 10. The frame 10 is also usually provided with a power mechanism for driving the walking track 1, such as a motor, a control panel, etc., when in operation, the temperature in the frame 10 is relatively high, and the exhaust fan 101 is arranged to cool and cool the inside of the frame 10. The exhaust fan 101 is generally installed at the rear end of the housing 10.
The utility model discloses photovoltaic electroplax's self-cleaning robot, as shown in fig. 3 and fig. 4, detecting element 3 and the control unit 4 still have usually in the frame 10, detecting element 3, walking track 1 power unit (not shown), cleaning assembly 2's water pump 22 and cleaning brush 24 luffing motion power unit (not shown) are equallyd divide and do not are connected with the 4 communication of control unit, and detecting element 3 is used for the feedback photovoltaic electroplax's self-cleaning robot's positional information, control unit 4 are used for receiving the information of detecting element 3 feedback to control walking track 1's walking route, the clean action of control cleaning assembly 2. Specifically, the control unit 4 controls the cleaning action of the cleaning assembly 2, i.e. whether the water pump 22 of the cleaning assembly 2 is turned on, whether the water spray pipe 23 sprays water, and whether the cleaning brush 24 swings downwards to contact with the board surface to be cleaned for cleaning. This arrangement makes the robot cleaner more intelligent.
The utility model discloses photovoltaic electroplax's self-cleaning robot, detecting element 3 includes infrared distance measuring sensor 31, gyroscope 32 and inclination sensor 33. The infrared distance measuring sensor 31 is used for detecting the moving position of the robot in real time, and the gyroscope 32 and the tilt sensor 33 are used for feeding back the moving direction and angle of the robot. This setting, position and the motion state of feedback robot can be accurate, make things convenient for the walking track 1 of the control unit 4 control to walk according to the walking route of regularization, judge whether clean subassembly 2 treats clean face and cleans.
The utility model discloses photovoltaic electroplax's self-cleaning robot, when infrared distance measuring sensor 31 detecting robot's shift position, compare other distance measuring sensors such as ultrasonic ranging sensor, have high accuracy, high accuracy.
The utility model discloses photovoltaic electroplax's self-cleaning robot, preferably, detecting element 3 still includes infrared camera 34, and infrared camera 34 is installed and is violently located the preceding tip of frame 10 in spray pipe 23. Infrared camera 34 is used for shooing photovoltaic electroplax and environmental information, makes things convenient for the backstage to model to monitor the position of robot, and simultaneously, infrared camera 34 still is used for the status information of real-time detection photovoltaic electroplax, for example whether photovoltaic electroplax is clean, whether has the stain on it, if has the stain on detecting the photovoltaic electroplax, control unit 4 can plan the moving route of robot, makes the robot can be directed to cleaing away of the stain on the photovoltaic electroplax.
The utility model discloses photovoltaic electroplax's self-cleaning robot, infrared camera 34 still can detect the state of photovoltaic electroplax, if the photovoltaic electroplax damages, whether need restore.
The utility model discloses photovoltaic electroplax's self-cleaning robot, preferably, detecting element 3 still includes photoelectric sensor 35. Photoelectric sensor 35 is used for real-time response environment light, make things convenient for control unit 4 to judge whether daytime or evening, go on according to judging the structure, control walking track 1 and clean subassembly 2, whether remove and clean with the control robot, in operation, for the influence of the removal of avoiding the robot and clean to photovoltaic board electricity generation, only clean evening usually, detect when evening at photoelectric sensor 35 promptly, control unit 4 just can control the removal and the cleanness of robot.
The utility model discloses photovoltaic electroplax's self-cleaning robot, through photoelectric sensor 35's setting, the clean time of control robot that can be nimble ensures in the evening of photovoltaic electroplax electricity generation completely, and the robot is opened and is cleaned the operation, and the robot can not disturb the electricity generation of photovoltaic electroplax, and the activity duration is more reasonable.
The utility model discloses photovoltaic electroplax's self-cleaning robot, the single-chip microcomputer 41 and the PLC 42 that the control unit 4 is connected including the communication, detecting element 3 is connected with single-chip microcomputer 41, 1 power unit in walking track, the water pump 22 of clean subassembly 2 and the 24 luffing motion power units of cleaning brush equally divide do not to be connected with the PLC 42 communication of control unit 4, single-chip microcomputer 41 controls 1 power unit in walking track, the water pump 22 of clean subassembly 2 and the 24 luffing motion power units of cleaning brush through PLC 42.
The utility model discloses right the utility model belongs to the technical field of the ordinary skilled person, do not deviating from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (8)
1. The utility model provides an automatic cleaning robot of photovoltaic electroplax which characterized in that: including the frame, locate a pair of walking track and the clean subassembly of frame, the bottom of the double-phase offside of frame is located to a pair of walking track, clean subassembly includes the cleaning brush, the water tank, water pump and spray pipe that connect gradually with the water tank, water tank and water pump are installed in the frame, the preceding tip of frame is violently located to the spray pipe, a plurality of water jets have been seted up along its length direction on the surface to the spray pipe lower part, but the cleaning brush luffing motion ground is installed in the back tip of frame, the cleaning brush includes a plurality of horizontal arc sub-brushes that set up side by side, the arc center of every arc sub-brush is located the one side that the arc sub-brush is close to the frame, the mounting height of arc sub-brush can be.
2. An automatic cleaning robot of photovoltaic electric panels according to claim 1, characterized in that: the transverse width of the cleaning brush is larger than that of the water spray pipe.
3. An automatic cleaning robot of photovoltaic electric panels according to claim 1, characterized in that: an exhaust fan is arranged on the frame.
4. An automatic cleaning robot of photovoltaic electric panels according to claim 1, characterized in that: the automatic cleaning robot is characterized in that a detection unit and a control unit are arranged in the rack, the detection unit, the walking track power mechanism, the water pump of the cleaning assembly and the cleaning brush up-and-down swing power mechanism are in communication connection with the control unit respectively, the detection unit is used for feeding back position information of the automatic cleaning robot of the photovoltaic panel, and the control unit is used for receiving information fed back by the detection unit, controlling a walking path of the walking track and controlling cleaning action of the cleaning assembly.
5. Automatic cleaning robot of photovoltaic panels according to claim 4, characterized in that: the detection unit comprises an infrared distance measurement sensor, a gyroscope and an inclination angle sensor.
6. Automatic cleaning robot of photovoltaic panels according to claim 5, characterized in that: the detection unit further comprises an infrared camera which is arranged at the front end part of the frame transversely arranged on the spray pipe.
7. Automatic cleaning robot of photovoltaic panels according to claim 5, characterized in that: the detection unit further includes a photosensor.
8. Automatic cleaning robot of photovoltaic panels according to claim 4, characterized in that: the control unit comprises a single chip microcomputer and a PLC which are in communication connection, the detection unit is connected with the single chip microcomputer, and the walking track power mechanism, the water pump of the cleaning assembly and the cleaning brush up-and-down swinging power mechanism are respectively in communication connection with the PLC of the control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021997009.1U CN213162159U (en) | 2020-09-14 | 2020-09-14 | Automatic cleaning robot for photovoltaic panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021997009.1U CN213162159U (en) | 2020-09-14 | 2020-09-14 | Automatic cleaning robot for photovoltaic panel |
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| Publication Number | Publication Date |
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| CN213162159U true CN213162159U (en) | 2021-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021997009.1U Active CN213162159U (en) | 2020-09-14 | 2020-09-14 | Automatic cleaning robot for photovoltaic panel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114910174A (en) * | 2022-07-14 | 2022-08-16 | 徐州科华能源科技有限公司 | Solar photovoltaic material layer temperature measuring device |
| CN115842514A (en) * | 2023-02-21 | 2023-03-24 | 山东小鸭新能源科技有限公司 | Photovoltaic panel surface cleaning device |
-
2020
- 2020-09-14 CN CN202021997009.1U patent/CN213162159U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114910174A (en) * | 2022-07-14 | 2022-08-16 | 徐州科华能源科技有限公司 | Solar photovoltaic material layer temperature measuring device |
| CN115842514A (en) * | 2023-02-21 | 2023-03-24 | 山东小鸭新能源科技有限公司 | Photovoltaic panel surface cleaning device |
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