OPERATOR’S FATIGUE OF HAND TRACTORS
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Transcript of OPERATOR’S FATIGUE OF HAND TRACTORS
OPERATOR’S FATIGUE OF
HAND TRACTORS
GROUP NO :1
Hand Tractors Usually used in developing
countries For land preparation in dry &
wet conditions Suitable for small size fields Operator guide the machine by
walking along behind it
Operator’s fatigue
During field operations hand tractors impose a greater work load on the operator
Its results in fatigue Needs more human energy than a
conventional tractor
Important Short Comings in field Operation
Excessive vibration feel as the hand grip Uncomfortable postures Vibration cause diseases in hands
Vibration syndrome Finger disorder Causing pain Loss of ability to hold the controls
Work related fatigue Work related pain
Cont…..
Hand Tractor’s Human Energy Demand
The human energy demand in the operation of a hand tractor is influenced by
Forward speed The machine balance The type of task (wet land/dry land)
How to Reduce Operator’s Fatigue???
A hand tractor was modified to enable operation in a seated position
The seated posture of operation requires minimal muscular effort
Reduce the pressure
A Hand Tractor Operator Seat should be comfortable
to control; Steering Clutch Break Clutch High-low speed change lever Main speed change lever Blade speed change gear lever
Other Hints for a Comfortable Seat..
Back support & foot rests Ensure Stability Proper seat moments for different
operators
Design of a seatSeat pan Strong enough to support
the weight of an operator up to 80kg
Leaf spring Support the seat & acted as a shock absorber
backrest Small backrest of 200mm & depth of 360mm
footrest Care was taken to ensure comfort in the seated posture
Advantages of incorporating a Hand
Tractor seat… Reducing Human energy consumption. Reducing the operational time. Increase the efficiency for road transport Reducing Work related body pain. Reducing vibration intensity in
acceleration.
References
“Operator’s Fatigue in Field Operation of Hand Tractors” V.K.Tewari , K.N.Dewangan, published online on 24th July 2004
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