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绳子与水桶

112 bytes removed, 02:49, 25 October 2015
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| valign="top" | - 技术简易,造价与维护费用低廉<br>
- 最深可在100米处运作<br>
- 通过畜力运作的绳与双桶提水装置能每分钟供水200多升通过畜力运作的绳与双桶提水装置每分钟能供水200多升<br>| valign="top" | - Water Delivery from Human Operated Rope and Bucket Water Lifter is limited to 15 l/min. 通过人力运作的绳桶提水装置每分钟仅能供水15升<br>- Animals need to be maintained all year even when irrigation is not necessary.动物全年都需要养护,甚至不用灌溉时也要养护<br>- Relatively low efficiency for traditional human and animal operated designs (10传统的人畜运作设计相对低效(10-40%).<br>
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===Construction, operations and maintenance建造、运作与维护===
[[Image:RopeandBucketdrawing.jpg|thumb|right|200px|Rope and bucket lifting device. Drawing: WHO.]]
Range of depth: 0–15 m (or more sometimes).
The rope and bucket lifter can also be adapted to include two buckets which are raised and lowered alternately. In this case the pulling animal moves in a circular path and with the help of central rotating lever, rope and pulley arrangement the buckets move up and down. Each bucket has a carrying capacity of up to 70 litres. The buckets have a hinged flap at the bottom, which acts as a valve. Guide rods are provided in the well to control the movement of the buckets. The buckets are automatically filled and emptied during operation. This device can lift about 230 litres /min from depths of up to 5 metres.
====Maintenance维护====
The bucket is lowered and raised by playing out and pulling in the rope, or by rotating the windlass. Care must be taken to prevent the rope or bucket from be- coming soiled. Preventive maintenance consists of greasing the bearings of the windlass or pulley.
Small repairs are limited to patching holes in the bucket and hose, reconnecting the hinge of the bucket, and fixing the windlass bearings or handle. All small repairs can be done by local people, and with tools and materials available in the community or area. Major repairs and replacements mainly consist of replacing the bucket, hose, rope, or part or all of the windlass. Woven nylon ropes may last for two years, but twined nylon or sisal ropes last only a few months. A good-quality hose may last for over two years, and most buckets last a year (depending on the material and quality). When people use their own rope and bucket, no extra organization is required. For community wells, a community committee usually organizes the maintenance and cleaning of the well, maintenance of the windlass, etc. Most repairs can be paid with ad hoc fund-raising.
[[File:rope and bucket OM.jpg]]
====Potential problems潜在问题====
— Poor-quality rope deteriorates quickly (e.g. sisal rope lasts for only a few months); <br>
— The bucket falls into the well ... to prevent this, communities can keep a spare bucket and fit the bucket into a protective cage; <br>
— The rope-and-bucket system is only suitable for limited depths.
===Costs成本===
From US$ 6 for a plastic bucket and 5 m of rope, to US$ 150 with a windlass, hose and closed superstructure, in Liberia (Milkov, 1987).
===Field experiences实地经验===
Area of use: All over the world.
===Manuals, videos, and links指南、视频与链接===
* [http://www.fao.org/docrep/010/ah810e/AH810E05.htm 3. REVIEW OF PUMPS AND WATER LIFTNG TECHNIQUES]. FAO.
* [http://www.cd3wd.com/cd3wd_40/cd3wd/Practact/KnO-100410-human_animal_water_lifters.pdf HUMAN & ANIMAL POWERED WATER-LIFTING DEVICES FOR IRRIGATION] (full PDF). Practical Action.
* Extensive manual on water lifting methods: [http://docs.watsan.net/Downloaded_Files/PDF/Baumann-2010-WASH.pdf WASH technology information package.] UNICEF, 2010.
===Acknowledgements鸣谢===
* Brikke, François, and Bredero, Maarten. [http://www.washdoc.info/docsearch/title/117705 Linking technology choice with operation and maintenance in the context of community water supply and sanitation: A reference document for planners and project staff] or ([http://www.who.int/water_sanitation_health/hygiene/om/wsh9241562153/en/ alternative link]). World Health Organization and IRC Water and Sanitation Centre. Geneva, Switzerland 2003.
* [http://practicalaction.org/practicalanswers/product_info.php?products_id=378&attrib=1 Human- & Animal-Powered Water Lifters for Irrigation.] Practical Action.
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