Changes

Jump to: navigation, search

Bucket hoists, Windlasses, and Mohtes

2,808 bytes added, 00:49, 10 November 2015
no edit summary
{{stubLanguage-box|english_link= Bucket hoists, Windlasses, and Mohtes | french_link= Coming soon | spanish_link= Coming soon | hindi_link= Coming soon | malayalam_link= Coming soon | tamil_link= Coming soon | korean_link= Coming soon | chinese_link=提桶装置、绞盘及自动倒水桶| indonesian_link= Coming soon | japanese_link= Coming soon }}[[Image:bucket hoist icon.png|right|100px80px]][[Image:bucket and windlass.jpg|thumb|right|250px200px|Fatima, Adija and Albertina collecting water from a protected well with a bucket and windlass. Photo: [http://www.wateraid.org/uk/what_we_do/where_we_work/mozambique/434.asp WaterAid / Jon Spaull.]]]__NOTOC__ <small-title />[[Image:mohte.jpg|thumb|right|200px|Self-emptying mohte with inclined tow path. Photo: FAO.]][[Image:windlass.jpg|thumb|right|200px|The mechanics of a windlass used in a bucket/rope system. Photo: [http://docs.watsan.net/Scanned_PDF_Files/Class_Code_2_Water/231-3483.pdf Safe Windlass, Shallow Well.] WHO.]]
The bucket hoist, windlass, and mohtes (charsa or charus) are all modifications of the simple [[Image:mohte.jpg|thumb|right|250px|Self-emptying mohte with inclined tow path. Photo: FAO.Rope and bucket]][[Image:windlass.jpg|thumb|right|250px|The mechanics of a windlass used in a bucket/rope system. Photo: [http://docs.watsan.net/Scanned_PDF_Files/Class_Code_2_Water/231-3483.pdf Safe Windlass, Shallow Well.] WHOto improve ease and efficiency.]]
There is a family of devices for pulling up a container of water on a rope. The bucket hoist, windlass, Mohtes, and water skips are all modifications of the simple simplest form for this is a [[Rope rope and bucket]] system, which in an improved form has a simple windlass, i.e. a hand operated winch, to improve ease increase the leverage and efficiencyhence the size of bucket that can be lifted.
There The output of such systems is generally too small for irrigation, (they tend to be used mainly for domestic or livestock water supply duties), but by powering the device with animals, usually oxen, sufficient water can be lifted to irrigate even through heads of 5-10m.  ====The two-bucket alternative====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 family circular path and with the help of devices for pulling central rotating lever, rope and pulley arrangement the buckets move up and down. Each bucket has a container carrying capacity of water on up to 70 litres. The buckets have a hinged flap at the bottom, which acts as a ropevalve. Guide rods are provided in the well to control the movement of the buckets. The simplest form for this is a [[rope buckets are automatically filled and emptied during operation. This device can lift about 230 litres /min from depths of up to 5 metres. ====Mohte====Soon came the evolution of the "self-emptying bucket]]", which known in an improved form India as a "mohte". This commonly has a simple windlassbucket made of leather, igalvanized iron sheets, or rubber, and with a hole in its bottom which is held closed by a flap which is pulled tight by a second rope harnessed to the animals.eThe device consists of a bucket having a capacity of 180 -225 litres. The bucket is fixed on a hand operated winch, stout iron ring with an iron framework at the top. It is attached to one end of a long strong rope. A pair of bullocks (castrated bulls) are hitched to the other end of the rope which provide the power to increase lift the leverage and hence bucket. The bullocks, while pulling up the size full bucket, walk down an earthen ramp sloped at an angle of 5 -10 degrees, thereby obtaining some advantage of their weight in exerting the necessary force to lift the bucket that . Two men are needed to operate onepair of bullocks. Two buckets at a time can also be liftedoperated with one extra pair of bullocks. It is suitable to lift water from deep wells. The depth may exceed even 30 metres. Two pairs of bullocks with three men discharge about 9000 litres of water per hour from a depth of 15 metres. ===Suitable conditions===The number of mohtes in use today is still in the order of a million or more, so this device remains of considerable importance in some regions.
The output of such systems {| border="1" cellpadding="5" cellspacing="0" align="center"|-! width="50%" style="background:#efefef;" | Advantages! style="background:#f0f8ff;" | Disadvantages|-| valign="top" | - Simple technology which is generally too small for irrigation, (they tend inexpensive to build and maintain. <br>- Can be used mainly for domestic or livestock water supply duties), but by powering the device with animals, usually oxen, sufficient water can be lifted operated at depths of up to irrigate even through heads of 5100 m.<br>-10m. This encouraged the evolution Water Delivery from Animal Operated Rope and Bucket Water Lifter of the "self-emptying over 200 l/min for double bucketsystem.| valign=", known in India as a top"mohte". These commonly have a bucket made of leather or rubber, with a hole in its bottom which | - Water Delivery from Human Operated Rope and Bucket Water Lifter is held closed by a flap which is pulled tight by a second rope harnessed limited to the animals15 l/min. The number in use today <br>- Animals need to be maintained all year even when irrigation is still in the order of a million or more, so this device remains of considerable importance in some regionsnot necessary. Mohtes are discussed in more detail under Section 4.3 dealing with <br>- Relatively low efficiency for traditional human and animal power as a prime mover.operated designs (10-40%) |}
===Acknowledgements===
* [http://www.fao.org/docrep/010/ah810e/AH810E05.htm REVIEW OF PUMPS AND WATER LIFTING TECHNIQUES.] Natural Resources Management and Environment Department, Food and Agriculture Organization (FAO).
* Water Lifting Devices, Booklet No. 262. Irrigation: IRS - 1. Inseda.org
* Jane Olley, [http://www.cd3wd.com/cd3wd_40/cd3wd/Practact/KnO-100410-human_animal_water_lifters.pdf Human and animal powered water lifting devices]. Practical Action. November 2008.
Winona
Akvopedia-spade, akvouser, bureaucrat, emailconfirmed, staff, susana-working-group-1, susana-working-group-10, susana-working-group-11, susana-working-group-12, susana-working-group-2, susana-working-group-3, susana-working-group-4, susana-working-group-5, susana-working-group-6, susana-working-group-7, susana-working-group-8, susana-working-group-9, susana-working-group-susana-member, administrator, widget editor
30,949
edits
Retrieved from "https://akvopedia.org/wiki/Special:MobileDiff/13951...30014"

Navigation menu