Koppens Machinefabriek B.V.

TETRA LAVAL
GROU

1 SPIRAL FREEZER - SVR 400/600/900 -

INDEX

Chapter Page

2. Description 2.1 to 2.8

2.1 General 2.1 + 2.2

2.2 Machine parts 2.3 to 2.8

- belt tensioning unit 2.3
- Drive motors 2.4
- Belt travel protections 2.5
- Cooling system 2.6
- Air circulation 2.7
- Tape washing machine 2.8
Koppens Machinefabriek B.V.
r._!
TETRA LAVAL
GROUP

1 SPIRAL FREEZER - SVR 400/600/900 -

2. DISCRIPTION

2.1 GENERAL
The most important part of the installation is the rotating drum. This
drum is driven by a motor. The conveyor
belt is wound around the drum like a spiral and is driven by the friction
between the belt and the drum . The friction force takes up most of the
tape drive for his account. The drum is lined with plastic strips to
prevent excessive wear on the belt .

In addition to the drum, the belt is also driven by a motor. This tape
drive has a dual function :
- Regulating the belt speed in relation to the drum motor.
- Provide a certain belt tension, so that the belt lies tightly around the
drum and experiences sufficient frictional force .

A weight roller is mounted behind the belt motor to collect the excess
tire. This weight roller is loosely suspended in a guide so that it can
move up and down freely. Due to the weight of the roll, the slack part of
the belt is held taut

output

trommel mbaontdor
Weight rol
-c:::J- - - - 1 - i trmomotmorel
ni :vo e-r - - - - 1;.; ; ; ; ;;; ; ; J: - •

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Koppens Machinefabriek B.V. TETRA LAVAL
GROU

1 SPIRAL FREEZER - SVR 400/600/900 -

2. DISCRIPTION

2.1 GENERAL
The ratio between the speed of the drum and the belt is
very important . The drum should spin faster than the belt. This is called
the "positive slip" or the "overdrive".
The "overdrive" is required to have a good driving force to the tire to be
whic ikkelen . Without "overdrive" or even with a negative slip , the
drum will brake the tire, causing excessive tension in the tire and serious
damage .
The degree of "overdrive" depends on the friction between the belt,
tr o mmel and guide. Also, changes in temperature, v o chtigheid or oil,
and other impurities have an influence. The v oo ring suggested
" o verdrive" is 3 times the height difference of the belt in a
for w enteling . With this setting, the belt tension is not too ho o g , and
the band will be a constant, "shock-free" loop v e rt o n e n.
D o o r wear will alter the belt pitch after a period of time. H i with it
verand e rd is also the "overdrive". It is therefore important, that
when n o rmale ond e rh o ud t e monitor and , if
necessary, to be set . (see
hiervo o r p . 3.7 . : The determining and balancing of the "overdrive") .
For w e INIG overdrive (= high belt tension), the band will
ernslig b e damage.
A high overdrive will cause the band to jerk visibly . However, the belt
tension is low.

© - svr- 2.2 ,
Koppens Machinefabriek B.V.
b
T ETRA LAVAL
GROUP

1
1
SPIRAL FREEZER - SVR 400/600/900 -

2. DISCRIPTION

2.2 MACHINE PARTS

Belt tensioning unit

The belt tensioning unit consists of a drive motor and a weight

roller . The gewichtrol is a role that loose in a vertical guide has
been suspended. The roller can move freely from top to bottom in
this guide . Due to this movement, the roll can take up an excess
of tape within certain limits . Upon crossing of the border is the
ma c hine by the limit switch stops. The drive motor provides for
a certain band tension. Due to the gewichtrol is the band tightly
held.

uitrner

eind
schakelaar

gewichtrol

eind
schakelaar

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Koppens Machinefabriek B.V.
r..!
TETRA LAVAL
GROUP

1 SPIRAL FREEZER - SVR 400/600/900 -

2. DISCRIPTION

2.2 MACHINE PARTS

Drive motors
The spiral freezer is standard equipped with two drive motors.

- Drum motor
This is mounted in the
girlf srui m to . Depending
on the dimensions and capa ca
pacity of the machine, it
trommel
is provided with a dub
bele, single or angled re
ductiekast.
The drum is supplied via a by
the motor
chain of driven. The chain is
spanner automatically
kept under tension.
trommelmotor

DThe tensioner consists of 2 bushes

that move together, with a
compression spring. With a set screw
at the rear, the spring is given a
certain pre-tension. Further, the
treatment may spe between the inner -
and outer sleeve are set with two brass
screws.
- Belt motor
The belt motor is mounted at the exit of the freezer, just in front of the
weight roll. In special cases it is possible that the motor is mounted in
the freezer compartment
The motor is equipped with a variator box as standard. With a hand
wheel on the variator can , the speed controlled to be. See page 3.7,
how to determine and adjust the "overdrive" .
After the setting of the rate is the wise, the handwheel to remove. So is
preventing it an established motor ontre money is.

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Koppens Machinefabriek B.V. TETRA LAVAL
GROU

j SPIRAL FREEZER - SVR 400/600/900 -

'

.2. DISCRIPTION

2.2 MACHINEPARTS
Belt running protections

The belt run is protected by various limit switches .

eindscbakelaar
- In the freezer.
These limit switches serve

to secure the tape loop around

the drum. If
the clamping voltage of the tire to
be high is, will be the outside of the
tire up blows. (Christmas
tree effect)
The tapetravel protection exists
from a vertical rod with pen s,
which is just above the band
trommel
hange n . The bar is suspended at
the top and bottom of a bus . (In
the latest versions with a leaf
spring to prevent freezing .)
When the belt folds up, it pushes
up a pin , the bar moves up and the
limit switch is activated.
stang The tape run stops when the end
switch is activated .
bus

- [lee exports . (See strap tensioning unit drawing , page 2.3)

The weight roller has a free play within a guide . A limit switch
is mounted at the top and bottom of the guide .
If the belt becomes too long or breaks due
to wear , the roller weight drops down, the limit
switch is operated and the belt run stops.
If the belt continues to stabbing, will by too little flow of
the role upward movement. The rising roller activates the upper limit
switch , which stops the tape running .

The remedy of the above faults is further be attributed to p.

3.4 and 3.5.

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Koppens Machinefabriek B.V. TETRA LAVAL
GROU

1 SPIRAL FREEZER - SVR 400/600/900-

2. DISCRIPTION

2.2 MACHINE PARTS

Cooling system

The spiral freezer is equipped with an evaporator and fans as

standard . This evaporator must be connected to a refrigeration
system .
The cooling system is based on the principle of an evaporating
liquid . Evaporation requires heat, which is extracted from the
environment, resulting in a temperature drop.

The basic principle of the cooling system is as follows :

COMPRESSOR

CONDENSOR

EXPANSIE­
ORGAAN

The coolant is evaporated in the freezer. This takes place in the

evaporator. The vapor is extracted by the compressor, compressed
and fed to the condenser. In the condenser, the vapor is cooled with
cooling water or air (or combination) so that it condenses . (becomes
liquid). So here the opposite happens as in the evaporator.
The liquid refrigerant is returned to the evaporator via the expansion
device, which reduces the pressure in the line. This way the process
starts all over again .

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 .!
Koppens Machinefabriek B.V. TETRA LAVAL
GROUP

· SPIRAL FREEZER - SVR 400/600/900 -

2. DISCRIPTION

2.2 MACHINE PARTS

Air circulation

The fans initiate forced air circulation in the freezer compartment .

The fans suck air from the freezer compartment and blow it
through the evaporator to go, in the spiral tower. The air is
cooled in the evaporator . In the tower, the cooled air
is guided over the products through the
plating . The air heats this up. On
the front left the air the tower and is by the fans sucked.

ventilator

l invoer

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Koppens Machinefabriek B.V. TETRA LAVAL
GROU

1 SPIRAL FREEZER - SVR 400/600/900 -

2. DISCRIPTION

2.2 MACHINE PARTS Belt washing machine

The belt washing machine has been specially developed for cleaning
the endless belt of the spiral freezer .
the machine consists of 3 sections:

- Washing section .
In the scrubbing section the band is under high pressure hosed . This
is done by 4 spray pipes on which flat jet nozzles are
mounted. The wash water circulating e rt from the collecting
container via detachable z ff and using ee n impeller pump.
The tank via a float valve connected to the cold water
network through
which the contents of the tank at level maintained is. An excess of
water is discharged via the overflow .
The washing water is heated in the tank by standard built-
in electrical plug-in elements.

- Rinse section .
In the post rinse section is the band with clean water hosed . This is
done by a spiro e ipijp on which flat jet nozzles ge mounted to
be. The spray nozzle is connected are in the cold or hot water
system. The spray water flows back to the . tank of the washing
section and ensure that to change. The excess water is discharged to
the sewer via an overflow .

- A fblaassectie .
In the blow-off section, the water droplets hanging on the belt are
blown away so that the belt enters the freezer compartment drip-free.

bandloop

afblaassectie spoelsectie wassectie

!
I\ \
- -+
zeven

Note : During freezing should the tire washing machine will

not be used or filled ge are with water.

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