CN107713908B - Dust removal method for machine room equipment - Google Patents
Dust removal method for machine room equipment Download PDFInfo
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- CN107713908B CN107713908B CN201711124837.7A CN201711124837A CN107713908B CN 107713908 B CN107713908 B CN 107713908B CN 201711124837 A CN201711124837 A CN 201711124837A CN 107713908 B CN107713908 B CN 107713908B
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- 239000000428 dust Substances 0.000 title claims abstract description 232
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000004888 barrier function Effects 0.000 claims description 3
- 230000002441 reversible effect Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Classifications
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
- A47L9/2805—Parameters or conditions being sensed
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/009—Carrying-vehicles; Arrangements of trollies or wheels; Means for avoiding mechanical obstacles
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
- A47L9/2836—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means characterised by the parts which are controlled
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
- A47L9/2836—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means characterised by the parts which are controlled
- A47L9/2852—Elements for displacement of the vacuum cleaner or the accessories therefor, e.g. wheels, casters or nozzles
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L2201/00—Robotic cleaning machines, i.e. with automatic control of the travelling movement or the cleaning operation
- A47L2201/04—Automatic control of the travelling movement; Automatic obstacle detection
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L2201/00—Robotic cleaning machines, i.e. with automatic control of the travelling movement or the cleaning operation
- A47L2201/06—Control of the cleaning action for autonomous devices; Automatic detection of the surface condition before, during or after cleaning
Abstract
The invention provides a dust removal method of machine room equipment, and belongs to the field of automatic dust removal, aiming at solving the problems that manual dust removal is time-consuming and labor-consuming. The invention is realized based on a dust removal device, the dust removal device is provided with an up-down, left-right and front-back movement platform, and then the dust removal device is controlled to remove dust on the surface of equipment in a machine room. The invention is used for dedusting the surface of equipment in a machine room.
Description
Technical Field
The invention relates to a dust removal method, in particular to a dust removal method of machine room equipment.
Background
Dust can be said to be a strong enemy of the machine room, so dust removal measures should be made in the machine room. Because present network equipment and server can produce a lot of heats at the in-process of operation, in order to distribute away these heats, all can adopt the mode of initiative heat dissipation to discharge the heat usually, and because the space of computer lab is narrow and small, these equipment adopt the forced air cooling mode to dispel the heat usually, and the louvre carries into equipment inside with the dust with the air-engaging of convection current, very high efficiency. In addition, some devices generate high voltage and static electricity during operation, which attract dust in the air.
The dust can entrain moisture along with corrosive materials into the interior of the apparatus. The coating on the electronic element can cause the heat dissipation capability of the electronic element to be reduced, and the long-term accumulation of a large amount of heat can cause the unstable operation of the equipment.
The existing dust reduction method comprises the following steps: for a large machine room, regional management should be performed under the condition that conditions permit, and equipment which is easily interfered by dust is separated from personnel entering the machine room as much as possible, so that the opportunity of contacting with dust is reduced. Regularly inspect the door and window of computer lab, wash air conditioner filtration system, the gap of shutoff and external contact stops the source of dust, maintains the computer lab air cleanness. Maintain computer lab environment humidity, strict control computer lab air humidity will guarantee promptly to reduce the raise dust, still need avoid air humidity too big simultaneously, equipment produces corrosion and short circuit.
The aforesaid all reduces the dust from the source, and follow-up clearance dust generally adopts absorption or quick-witted washing of tearing open, but all needs the clearance of manual work cooperation, wastes time and energy.
Disclosure of Invention
The invention aims to solve the problem that manual dust removal is time-consuming and labor-consuming in the prior art, and provides a dust removal method for machine room equipment.
The dust removal method of the machine room equipment is realized based on a dust removal device, and the dust removal device comprises:
the device comprises a left-right motion platform 1, an up-down motion platform 3, a front-back motion platform 4, a dust collection device, a sensing unit 5 and a control unit;
the left-right movement platform 1 is connected with the control unit and is used for driving the dust suction device to move left and right under the control of the control unit;
the up-and-down motion platform 3 is connected with the control unit and is used for driving the dust suction device to move up and down under the control of the control unit;
the front-back movement platform 4 is connected with the control unit and is used for driving the dust suction device to move front and back under the control of the control unit;
the sensing unit 5 comprises a plurality of sensors which are respectively arranged on the dust suction port 2 of the dust suction device and the outer side wall of the dust suction port 2;
the sensing unit 5 is used for detecting whether an obstacle and the distance between the obstacles exist in front of and outside the dust collection port 2, and sending the distance between the obstacles to the control unit when the obstacles are detected;
the control unit is used for controlling the left-right movement platform 1, the up-down movement platform 3 and the front-back movement platform 4 to move according to the barrier distance detected by the sensing unit 5, so that the dust collection device can remove dust from the equipment in the machine room;
the dust removal method comprises the following steps:
the method comprises the following steps: moving the dust removing device to the equipment of the machine room, and placing the dust suction port 2 of the dust removing device at any position of the surface of the equipment;
step two: the control unit controls the sensing unit 5 to work, the sensing unit 5 detects the relative distance between the dust collection port 2 and the surface of the equipment, and controls the front-back movement system to move, so that the relative distance between the dust collection head and the surface of the equipment is the dust collection distance;
step three: keeping the dust collection distance, controlling the dust collection device to move and collect dust by the control unit, changing the movement direction of the dust collection device when the sensing unit 5 detects the boundary, and continuing to move and collect dust until one surface of the equipment finishes dust collection.
Preferably, when the surface of the device to be dedusted is rectangular, the third step includes:
step three, firstly: searching a dust removal starting point:
the control unit controls the dust suction device to move and remove dust in one direction, when the sensor on the side of the movement direction on the dust suction port 2 does not detect an obstacle, the control unit controls the dust suction device to move and remove dust in the direction perpendicular to the one direction, and when the sensor on the side of the movement direction on the dust suction port 2 does not detect an obstacle, the position of the dust suction port 2 at the moment is taken as a dust removal starting position;
step three: at the starting point of dust removal, the dust collection device removes dust in a transverse/longitudinal direction, when the sensor on only the side of the movement direction on the dust collection port 2 does not detect an obstacle, the control unit controls the dust collection device to move to the transverse/longitudinal vertical direction by a step length, and the transverse/longitudinal reverse direction movement and dust removal are continued until the sensor on only the side of the movement direction on the dust collection port 2 does not detect the obstacle, and the step length is not larger than the width of the dust collection port 2; repeating the movement and dust removal in the step, and performing snake-shaped dust collection on the surface of the equipment; when the dust suction device moves a step length towards the transverse/longitudinal vertical direction and the sensor 5-1 on the dust suction port cannot detect an obstacle, one surface of the equipment finishes dust suction.
Preferably, when the control unit controls the dust suction device to move and remove dust, and when the sensing unit 5 outside the dust suction port 2 detects that the obstacle on the movement route exceeds the dangerous distance in the movement process, the control unit controls the front and rear movement platform 4 to move backwards until the obstacle on the movement route does not exceed the dangerous distance and the nearest obstacle distance detected by the sensor 5-1 on the dust suction port is the dust suction distance.
It is preferable to set the dangerous distance according to the moving speed of the dust suction port 2 and the time required to change the moving direction of the dust suction apparatus.
The features mentioned above can be combined in various suitable ways or replaced by equivalent features as long as the object of the invention is achieved.
The invention has the beneficial effects that the invention is realized based on the dust removal device, the dust removal device is provided with the up-down, left-right and front-back motion platforms, and further controls the dust removal device to remove dust on the surface of equipment in a machine room, aiming at the rectangular surface of the equipment, the invention provides a dust removal method based on the dust removal device, the dust removal device controls the motion and dust removal of the motion platform by means of the sensors 5-2 on the dust removal port 2 and the outer side wall, the direction of the dust removal device is automatically changed to remove dust when a boundary is met, so that the surface of the equipment can completely remove dust, meanwhile, the invention can automatically avoid obstacles and keep the dust removal distance, thereby achieving good dust removal.
Drawings
FIG. 1 is a schematic structural view of a dust removing apparatus according to the present invention;
FIG. 2 is a right side view of FIG. 1;
fig. 3 is a schematic structural diagram of a sensing unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
With reference to fig. 1 and fig. 2, a dust removing method for a machine room device according to this embodiment is described, where the dust removing method is implemented based on a dust removing device, and the dust removing device includes:
the device comprises a left-right motion platform 1, an up-down motion platform 3, a front-back motion platform 4, a dust collection device, a sensing unit 5 and a control unit;
the left-right movement platform 1 is connected with the control unit and is used for driving the dust suction device to move left and right under the control of the control unit;
the up-and-down motion platform 3 is connected with the control unit and is used for driving the dust suction device to move up and down under the control of the control unit;
the front-back movement platform 4 is connected with the control unit and is used for driving the dust suction device to move front and back under the control of the control unit;
as shown in fig. 3, the sensing unit 5 includes a plurality of sensors respectively mounted on the dust suction port 2 of the dust suction apparatus and on an outer sidewall of the dust suction port 2;
the sensing unit 5 is used for detecting whether an obstacle and the distance between the obstacles exist in front of and outside the dust collection port 2, and sending the distance between the obstacles to the control unit when the obstacles are detected;
the control unit is used for controlling the left-right movement platform 1, the up-down movement platform 3 and the front-back movement platform 4 to move according to the barrier distance detected by the sensing unit 5, so that the dust collection device can remove dust from the equipment in the machine room;
the dust removal method comprises the following steps:
the method comprises the following steps: moving the dust removing device to the equipment of the machine room, and placing the dust suction port 2 of the dust removing device at any position of the surface of the equipment;
step two: the control unit controls the sensing unit 5 to work, the sensing unit 5 detects the relative distance between the dust collection port 2 and the surface of the equipment, and controls the front-back movement system to move, so that the relative distance between the dust collection head and the surface of the equipment is the dust collection distance;
step three: keeping the dust collection distance, controlling the dust collection device to move and collect dust by the control unit, changing the movement direction of the dust collection device when the sensing unit 5 detects the boundary, and continuing to move and collect dust until one surface of the equipment finishes dust collection.
Preferably, when the surface of the device to be dedusted is rectangular, the third step includes:
step three, firstly: searching a dust removal starting point:
the control unit controls the dust suction device to move and remove dust in one direction, when the sensor on the side of the movement direction on the dust suction port 2 does not detect an obstacle, the control unit controls the dust suction device to move and remove dust in the direction perpendicular to the one direction, and when the sensor on the side of the movement direction on the dust suction port 2 does not detect an obstacle, the position of the dust suction port 2 at the moment is taken as a dust removal starting position;
in the embodiment, on the surface of the equipment, the dust suction port 2 is controlled to move leftwards, the left sensor on the dust suction port 2 does not detect an obstacle, namely the left boundary is detected, the dust suction port is controlled to move upwards, the upper sensor on the dust suction port 2 does not detect a sensor, namely the upper boundary is detected, and the current position is taken as the dust removal starting position;
step three: at the starting point of dust removal, the dust collection device removes dust in a transverse/longitudinal direction, when the sensor on only the side of the movement direction on the dust collection port 2 does not detect an obstacle, the control unit controls the dust collection device to move to the transverse/longitudinal vertical direction by a step length, and the transverse/longitudinal reverse direction movement and dust removal are continued until the sensor on only the side of the movement direction on the dust collection port 2 does not detect the obstacle, and the step length is not larger than the width of the dust collection port 2; repeating the movement and dust removal in the step, and performing snake-shaped dust collection on the surface of the equipment; when the dust suction device moves a step length towards the transverse/longitudinal vertical direction and the sensor 5-1 on the dust suction port cannot detect an obstacle, one surface of the equipment finishes dust suction.
In the embodiment, at the starting point of dust removal, the dust collection device moves rightwards and collects dust to the boundary, then moves downwards for setting a step length, moves leftwards and collects dust, the movement is repeated, snake-shaped dust collection is carried out, and when the dust collection device moves downwards for one step length and a sensor 5-1 on a dust collection port cannot detect an obstacle, one surface of the equipment finishes dust collection.
The invention is realized based on a dust removal device, the dust removal device is provided with an up-and-down, left-and-right and front-and-back movement platform, and then the dust removal of the dust removal device on the surface of equipment in a machine room is controlled.
In a preferred embodiment, when the control unit controls the dust suction device to move and remove dust, and when the sensing unit 5 outside the dust suction port 2 detects that the obstacle on the movement route exceeds the dangerous distance in the movement process, the control unit controls the forward and backward movement platform 4 to move backwards until the obstacle on the movement route does not exceed the dangerous distance and the nearest obstacle distance detected by the sensor 5-1 on the dust suction port is the dust suction distance.
When the dust removal device is used for removing dust, obstacles can be automatically avoided, the dust removal distance can be kept, dust removal is completed, and damage to protrusions on the surface of equipment is avoided.
When the dust suction port 2 moves backward, because the previous movement is still required due to inertia, if the dangerous distance is set to be too small, the dust suction port 2 may collide with an obstacle when the direction is changed, so in the preferred embodiment, the dangerous distance is set according to the movement speed of the dust suction port 2 and the time required for changing the movement direction of the dust suction device, so as to ensure that the dust suction port 2 does not collide with the equipment.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (3)
1. A dust removal method of machine room equipment is realized based on a dust removal device, and the dust removal device comprises:
the device comprises a left-right motion platform, an up-down motion platform, a front-back motion platform, a dust collection device, a sensing unit and a control unit;
the left and right movement platform is connected with the control unit and is used for driving the dust suction device to move left and right under the control of the control unit;
the up-and-down motion platform is connected with the control unit and is used for driving the dust suction device to move up and down under the control of the control unit;
the front-back movement platform is connected with the control unit and is used for driving the dust suction device to move front and back under the control of the control unit;
the sensing unit comprises a plurality of sensors which are respectively arranged on a dust suction port of the dust suction device and the outer side wall of the dust suction port;
the sensing unit is used for detecting whether an obstacle and the distance between the obstacles exist in front of and outside the dust collection port, and sending the distance between the obstacles to the control unit when the obstacles are detected;
the control unit is used for controlling the left-right movement platform, the up-down movement platform and the front-back movement platform to move according to the barrier distance detected by the sensing unit so as to realize the dust removal of the machine room equipment by the dust collection device;
the dust removal method comprises the following steps:
the method comprises the following steps: moving the dust removing device to the equipment of the machine room, and placing a dust suction port of the dust removing device at any position on the surface of the equipment;
step two: the control unit controls the sensing unit to work, the sensing unit detects the relative distance between the dust collection port and the surface of the equipment and controls the front-back movement system to move, so that the relative distance between the dust collection head and the surface of the equipment is the dust collection distance;
step three: keeping the dust collection distance, controlling the dust collection device to move and collect dust by the control unit, changing the movement direction of the dust collection device when the sensing unit detects the boundary, and continuing to move and collect dust until one surface of the equipment finishes dust collection;
the method is characterized in that when the surface of the equipment to be dedusted is rectangular, the third step comprises the following steps:
step three, firstly: searching a dust removal starting point:
the control unit controls the dust collection device to move and remove dust in one direction, when the sensor on the side of the movement direction on the dust collection port does not detect an obstacle, the control unit controls the dust collection device to move and remove dust in the direction perpendicular to the one direction, and when the sensor on the side of the movement direction on the dust collection port does not detect an obstacle, the position of the dust collection port at the moment is taken as a dust removal starting position;
step three: at the starting point of dust removal, the dust collection device removes dust in a transverse/longitudinal direction, when the sensor on only the movement direction side on the dust collection port does not detect the obstacle, the control unit controls the dust collection device to move a step length in the transverse/longitudinal vertical direction, and the transverse/longitudinal reverse movement and dust removal are continued until the sensor on only the movement direction side on the dust collection port does not detect the obstacle, and the step length is not larger than the width of the dust collection port; repeating the movement and dust removal in the step, and performing snake-shaped dust collection on the surface of the equipment; when the dust suction device moves a step length in the transverse/longitudinal vertical direction and the sensor on the dust suction port cannot detect an obstacle, one surface of the equipment finishes dust suction.
2. The dust removal method for the machine room equipment according to claim 1, wherein when the control unit controls the dust removal device to move and remove dust, and when the sensing unit outside the dust removal port detects that the obstacle on the movement path exceeds the dangerous distance during the movement, the control unit controls the front and rear movement platform to move backwards until the obstacle on the movement path does not exceed the dangerous distance and the nearest obstacle distance detected by the sensor on the dust removal port is the dust removal distance.
3. The dust removing method of the machine room equipment according to claim 1, wherein the dangerous distance is set according to a moving speed of the dust suction port and a time required to change a moving direction of the dust suction device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711124837.7A CN107713908B (en) | 2017-11-14 | 2017-11-14 | Dust removal method for machine room equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711124837.7A CN107713908B (en) | 2017-11-14 | 2017-11-14 | Dust removal method for machine room equipment |
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| Publication Number | Publication Date |
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| CN107713908A CN107713908A (en) | 2018-02-23 |
| CN107713908B true CN107713908B (en) | 2020-06-23 |
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| CN201711124837.7A Active CN107713908B (en) | 2017-11-14 | 2017-11-14 | Dust removal method for machine room equipment |
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| CN113877923B (en) * | 2021-10-22 | 2022-09-27 | 大昌建设集团有限公司 | Underground construction dust device |
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| JP2013154431A (en) * | 2012-01-30 | 2013-08-15 | Okumura Corp | Device for grinding and cleaning of concrete wall surface |
| CN103991434A (en) * | 2014-05-31 | 2014-08-20 | 青岛科技大学 | Full-automatic car wiping mechanical arm device |
| CN106002971A (en) * | 2016-06-17 | 2016-10-12 | 江苏大学 | Automatic cleaning mechanical arm for transmission line insulators |
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| CN107126156A (en) * | 2017-06-08 | 2017-09-05 | 唐建芳 | A kind of smart home clean environment firendly robot and its method of work |
| CN206475171U (en) * | 2017-02-03 | 2017-09-08 | 杜勍 | A kind of automatic car washing cleaning machine and car carwash |
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2017
- 2017-11-14 CN CN201711124837.7A patent/CN107713908B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013154431A (en) * | 2012-01-30 | 2013-08-15 | Okumura Corp | Device for grinding and cleaning of concrete wall surface |
| CN103991434A (en) * | 2014-05-31 | 2014-08-20 | 青岛科技大学 | Full-automatic car wiping mechanical arm device |
| CN106002971A (en) * | 2016-06-17 | 2016-10-12 | 江苏大学 | Automatic cleaning mechanical arm for transmission line insulators |
| CN206475171U (en) * | 2017-02-03 | 2017-09-08 | 杜勍 | A kind of automatic car washing cleaning machine and car carwash |
| CN106863327A (en) * | 2017-03-29 | 2017-06-20 | 国家电网公司 | A kind of intelligent machine arm dust pelletizing system based on human bioequivalence |
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