Selecting and weighing systems
The system is made by an automatic line which allows
to weight and to selection each fish unit and to group
them in determined quantity ready to be stored in
boxes.
The system is composed by:
- Tank to receive the fish with optional elevator
- Feeding belt
- Acceleration belt
- High speed weighing belt
- Selection belt with 10 boxes
- Personal Computer with software to analyze and
for machine monitoring
Description of the machine operating
The fish is put in the tank adapt to receive it after
its fishing. From this it is transferred by an elevator
to the alimentation flat-belt. The operator introduces
the fish in the alimentation belt at low speed. From
here the fish falls in the acceleration belt which
position it properly, gives more speed and send it
to the weighing belt. The fish is weight and then
transferred to the selection belt. The control system
then deviate the corresponding arm concerning the
proper exit so that the fish falls in the corresponding
box. When a box reaches the programmed weight, the
fish falls in the underlying case and the operator
is warned so that he can start the storage in the
boxes. It is possible to mount en eventual shunting
ribbon which moves in an automatic manner the boxes
full of fish to the packing section. The tank to receive
the fish is made so that it separates the fish from
eventual ice, it is also equipped by elevator with
washing. The fedding belt allows to speed the fish
before to move it on the weighing belt. The balance
which is joint to the weighing belt allows to weight
the fish while it is moving . The software for the
balance managing allows through a statistical analysis,
to settle boxes of a predetermined weight, each box
with a programmed fish size. The selection belt is
created with 10 outputs which represents the min.
number to guarantee an acceptable overweight in case
of different sizes. It is possible to add further
exits in case of particular needs. The exits are made
by onses on which the fish is stored.
Description of the single components
Tank to receive the fish
The tank to receive the fish it is sized to contain
about 500 kg of fish and it is completed by an elevator
belt 430mm width. A circulation pump is foreseen for
the fish washing and ice separation.
Feeding belt
This belt is 950 mm long and 300 mm width and allows
to load the fish for the following step i.e. the fish
weighing. It allows to send 90 pieces per minute.
Weighing belt
The weighing belt and the corresponding balance represents
the heart of the system. It allows a theoretic capacity
of 100 pieces per minute (this speed depends from
the fish size and from the loading at the origin)
with a 2 gr precision. Apart from the precise speed
the most important characteristics of this component
are the robustness and reliability which are fundamental
in this particular application. The control system
is completed by and an industrial PLC of the new generation
with a statistic software which allows to reduce the
waste of weight as the selection proceeds. The balance
is equipped with a simple interface which allows a
complete management of all the operations. Also it
is connected to the supervising PC from which it is
possible to access to all functions. The belt is 800
mm long and 250 mm width.
Selecting belt
The selecting belt is 6000 mm long and 300 mm wide.
Equipped with 10 exits made by deviation arms with
pneumatic control. Distance between the arms 600 mm.
It is possible to extend that belt in order to increase
the number of exits.
Cases for dischange
 The
cases pick up the fish deviated by the arms. When
the quantity reaches the desired weight the charging
door is closed and a luminous dial lamp turns on in
order to inform the operator to empty the case, through
a proper button reopen the charging door. As an option
it is possible to mount a further belt which allows
to move the full boxes and bring them in the packing
sector. This phase can be automated too.
Pc completed with software and supervising
The system is composed by a PC connected to the control
PLC with a supervising function. It allows to program
all the machine parameters, the monitoring in the
working real time, the diagnostic with historical
managing of the alarms. It also allows the production
managing by memorizing the total production and the
production per hour, statistics as concerns periods
and quantities etc. All the software is created in
Windows 98 environment and can be personalized according
to the plant needs. All the system is made by inox
steel AISI 316 and synthetic material.
Technical features
- Max theoretical selection speed: 100 pieces/min
The real speed is approximately 80% of the theoretic
because of the manual supplying
- Single piece precision: 2 gr
- Final box precision: 1%
- Number of exits: 10
- Loading belt dimension: 1500 mm x 300 mm
- Belt conveyor dimension: 950 mm x 300 mm
- Weighing belt dimension: 800 mm x 250 mm
- Selecting belt dimension: 6000 mm x 300 mm
- Max length for every piece: 500 mm
- Max width for every piece: 200 mm
- Electrical power: 380 VAC 50 Hz max consumption
- Pneumatic power: pipes max 6 bar, min 4 bar
- Working temperature: 5-45 C°
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