for days to ferment before being washed manually (Opeke
1992). This laborious manual method of peeling kolanut
posed a serious bottleneck to kolanut production and processing.
The development of a technically and economically
acceptable kolanut peeling machine poses a serious engineering
problem due to the sensitive nature of kolanut
cotyledon. Any bruise to the cotyledon reduces its market
value. These made it impossible for the adaptation and
adoption of mechanical machines used in peeling tubers
and dehulling of grains in the peeling of kolanut.
This work therefore developed a peeling machine capable
of handling and peeling kolanut with minimum damage and
loss.
Methodology
Design concept
A close observation of the traditional methods of peeling
kolanut gives a clue to possible mechanical methods
that could be used. In the traditional methods, kolanut
are soaked, and then using one or both hands, the nuts
are rubbed against each other, or most times pressed
and twisted with one hand thus enabling friction to
bring about peeling. In this design, an attempt was
made to simulate the hand action by using mechanical
ribbon flight screw conveyor; each ribbon was bolted to
a flat bar welded to the revolving shaft. The peeling
chamber was designed in such a way that it produced
more rubbing action by conveying and rubbing the nuts
against the barrel and against one another and the rubbing
action of the paddles itself on the kolanuts.
Description of the peeling machine
The peeling machine shown in Fig. 1 is basically a paddle –
flight screw mounted on a cylindrical shaft supported by
bearings with the shaft rotating in a stationary cylindrical
barrel. As the shaft rotates, the paddle flight screw enables
the machine to perform the peeling operation (convey and
rub the nuts against the barrel and against one another) when
the paddles mix and convey the kolanut away from the
hopper where it is fed to the discharge end of the assembly.
The friction that occurs between the paddle and the kolanut,
the rubbing of the kolanut against one another and the
friction between the kolanut and the barrel causes the testa
of the kolanut to peel.
The constructed peeling machine consists of the following
parts: the barrel, the shaft on which is welded the
paddle-flight, the hopper, the bearing, gear reduction electric
motor and the frame. Each component was designed following
standard engineering principle.
for days to ferment before being washed manually (Opeke
1992). This laborious manual method of peeling kolanut
posed a serious bottleneck to kolanut production and processing.
The development of a technically and economically
acceptable kolanut peeling machine poses a serious engineering
problem due to the sensitive nature of kolanut
cotyledon. Any bruise to the cotyledon reduces its market
value. These made it impossible for the adaptation and
adoption of mechanical machines used in peeling tubers
and dehulling of grains in the peeling of kolanut.
This work therefore developed a peeling machine capable
of handling and peeling kolanut with minimum damage and
loss.
Methodology
Design concept
A close observation of the traditional methods of peeling
kolanut gives a clue to possible mechanical methods
that could be used. In the traditional methods, kolanut
are soaked, and then using one or both hands, the nuts
are rubbed against each other, or most times pressed
and twisted with one hand thus enabling friction to
bring about peeling. In this design, an attempt was
made to simulate the hand action by using mechanical
ribbon flight screw conveyor; each ribbon was bolted to
a flat bar welded to the revolving shaft. The peeling
chamber was designed in such a way that it produced
more rubbing action by conveying and rubbing the nuts
against the barrel and against one another and the rubbing
action of the paddles itself on the kolanuts.
Description of the peeling machine
The peeling machine shown in Fig. 1 is basically a paddle –
flight screw mounted on a cylindrical shaft supported by
bearings with the shaft rotating in a stationary cylindrical
barrel. As the shaft rotates, the paddle flight screw enables
the machine to perform the peeling operation (convey and
rub the nuts against the barrel and against one another) when
the paddles mix and convey the kolanut away from the
hopper where it is fed to the discharge end of the assembly.
The friction that occurs between the paddle and the kolanut,
the rubbing of the kolanut against one another and the
friction between the kolanut and the barrel causes the testa
of the kolanut to peel.
The constructed peeling machine consists of the following
parts: the barrel, the shaft on which is welded the
paddle-flight, the hopper, the bearing, gear reduction electric
motor and the frame. Each component was designed following
standard engineering principle.
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