英语翻译Development of a mechanism for transplanting rice seedli

英语翻译
Development of a mechanism for transplanting rice seedlings
Edathiparambil Vareed Thomas *
Department of Agricultural & Food Engineering,IIT,Kharagpur 721092,India
Received 29 March 2000; accepted 13 September 2001
Abstract
Transplanting of seedlings is a labor intensive operation in the cultivation of rice.It is also a skilled job
and involves working with a stooping posture in a puddled field.There exists a need to mechanize this
operation.For this purpose the design of a mechanism was carried out following the method of analytical
synthesis.A planar four-bar linkage with coupler extension was selected as the basic design.The path
generated by the mechanism was plotted on a computer screen.By varying the dimensions of various links
in the mechanism different paths of output motion of the coupler point were obtained.The potential link
dimensions were identified based on the suitability of the path for picking,conveying and planting of
seedlings as well as the return motion.A four-row self-propelled transplanter using the above mechanism
and an optimized-planting finger was then developed and tested.The machine transplanting system was
found to be technically viable.1 2002 Elsevier Science Ltd.All rights reserved.
1.Introduction
India is predominantly an agricultural country with rice as one of its main food crop.It produces
about 80 million tons rice annually,which is about 22% of the world rice production.
Culturally,transplanting of young seedlings of 20–35 days age in water-inundated field is preferred
over direct seeding.The former leads to better yield due to better crop management
practices that are possible in a transplanted crop.The operation of transplanting requires large
amount of manpower (about 400 man-hour/ha) and the task is very laborious involving working
in a stooping posture and moving in muddy field.Hence,this is considered as an activity that
needs mechanization.Mechanization of transplanting facilitates mechanization of subsequent
activities also in the production of the crop.The machines that are already successful in Japan and
Korea could not be adopted in India because of economic cost constraints and due to the prevailing
cultural practices of this country.
Mechanism and Machine Theory 37 (2002) 395–410
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0094-114X/02/$ - see front matter 1 2002 Elsevier Science Ltd.All rights reserved.
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