الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 93 |  |  |
| | | from | 93 | | |
Abstract
5-SUMMARY AND CONCLUSSIONS
This study was carried out at Quwesna Agricultural
Mechanization Station to develop a front mounted mower
(Prototype) and also to improve the rear mounted mowers
widely utilized in Egyptian argiculture. During 1986. a
prototype of front mounted mower was developed. then in
1988-1989 a conveying belt for imporving the performance of
rear mounted mowers was designed and tested.
The front -mounted mower (Prototype) and the conveyor
for rear mounted mower were developed in order to
overcome some harvesting problems that usually Occure when
either self-propelled mower or tractor rear~ounted ones are
used resp.
Both of the improved equipement were tested and
evaluate4 comparing with the other of mowers under actual
field conditions during 1987- 1989. The selected field
crops tor mowing trials were wheat and cotton .
The developed mowers were constructed and attached to a
30 Hp agriCUltural tractor (kOUbot~.
For the front mounted mower (prototype ) the source of
power was taken from the front p.t.o of the koubota tractor
through bevel gears to transmit the power from the
crankshaft to the connecting rod of a single knife mower.
78
A nor.mal single knife bar of 127 cm wide with its
sides and connections (as normally used in self propelled
machines) was adapted and reassembled to be mounted on a
specially made frontal hydrQulic hitching. The selected
differential system was of speed ratio of ~bout 5 : 1.
In winter of 1988. a rear ~ounted mower was improved
by designing a conveyor consisting of a wide belt (100 x 150
cm) moving on two drums ( 7.5 cm diam. and 100 cm length).
The conveyor was attached to the mower frame and it
,r..
took its drive power from the crank~shaft of mower through
two transmission gears giving a speed reduction of 3 1
(4cm 12 cm diameteres), . The designed linear speed for
the conveyor was 118 m/min. at 500 r.p.m. of the
p.t.o. and 4.2 km/h. tractor forward-speed. This conveying
system served to overcome the main disadvantages of the
rear~ounted mowers which is the high cost of labor needed
for clearing the harvested wheat from the next tractor
swath .
The developed mowers were -tested and evaluated
comparing with the other two types of mowers: a) tractor
rear-mounted mower (Busatis B.M 1102 W-GERMANY manufactured
B) self propelled mower (FERRARi 702 ITALIAN) under actual
field conditions during 1987-1989.
79
Each type of mowers was tested under its recommended
speed except the prototype which was te8te~ under two
ditferent engine~speeds with three different gear
variations I. II and III resultuing in 6 difterent forward
speeds. The
,
variation in engine speeds were selected to
suit the type of crop and field surface -con~itions.
The results indicated that:
1- The average field capacities for front mounted mower
(Prototype) were 0.089 and 0.529 ted/h./meter of cutter,
bar width for harvesting of wheat and cutting stalks
of cotton resp.
The average field capacities for self-propelled mower
were 0.407 and 0.342 fed./h./meter of cutter bar width
for the harvesting of wheat and the cutting stalks of
cotton resp.
The average field capacities tor tractor rear mounted
,
mower were (0.736 and 0.65 ted/h./meter ot cutter-bar
width) for harvesting ot wheat and cutting stalks ot
cotton resp.
2- The average field etficiencies tor selt-propelled mower
were very low since they were 55.2 % and 57. tor cutting
stalks of cotton and harvesting wheat resp., while they
become slightly high tor both ot the prototyp~ and the
,I.
rear -mounted mowers, (67.2. and 73.82 _ )’ to~. the
--~---_._- ---_ ...
80
prototype and (70.2% and 74%) for the rear mounted mower
for cotton and wheat resp.
,
3- The prototype showed better results in the cutting and
harvestin~ efficiency by about (6% more than selfpropelled
mower and by about 4% more than rear mounted
mower since the cutting efficiency for the three mowers
were 96%. 90 % and 92 % resp . •
4- The average heights ot cut for the prototype were 4 and
3.65 cm for cotton and wheat resp .. 12 and 10 cm for
self -propelled mower. and 7.5 and 6.5 em for rear
mounted mower resp.
5- The harvesting cost of wheat for the prototype was less
than that for the self -propelled mower and rear mounted
mower since their operating costs were 7.7. 14.9 and
17.7 L.E/fed resp. This cost variation was mainly due to
the cost of labor needed for collection of the harvsted
wheat during the operation ot the rear-mounted mower (2
labours. h Ifed.)
6- The cutting cost ot cotton stalks widely varied from
6.42.L. E./fed using the rear~ounted mower to 8.09
L.E.lted. and 17.77 L. E./fed when using the prototype
(front mounted) and se1f-prope11ed mowers resp.These
data indicate that rear ~ounted mower was economically
I
favorable machine to cut cotton stalks while seltpropelled
mower was the most expensive machine to cut
.. _---_ .. _--
81
cotton stalks since its cost was almost equal to the
cost of manual cutting was {22 L.E. Ifed. on the basis
of 1989 prices} .
Test of the improved rear mounted mower resulted in
the following conculussions :-
The improved rear -mounted mower had the best results
in most of the evaluation parameters since. its field
capacity reached 1.19 fed/~ .. its field efficiency was 80 %
its cutting height was 4 em. its harvesting 10s8ee was 4
g/m2 ,and its harvesting cost was 6.83 L.E/fed.
The only one disadvantage ot the improved rear
mounted mower is the manual harvesting needed at the
begining of operation to clear a swath for tractor around
the field) inspite of that the rear mounted mower with
conveyor
....•.
is considered of’.’avorable machine for Egyption
agriCUlture conditions. . This improvment wil decrease the
harvesting cost spent in man power reqUired continuously •
after normal rear mounted mowers also. it will raise the
efficiency of the recent number of mowers used in egypt.