Wire cleaning machine (From a Plant for fire aluminizing steel
wire)
Wire cleaning is carried out electrochemically
The system is subdivided as follows
Electrochemical pickling; structured as follows
Blow-off nozzle block
Cascade rinse I
Blow-off - nozzle block II
Cascade rinsing II
Blow-off and drying nozzle block III
Description of the pickling process
In the pickling treatment, each individual wire is pickled
electrochemically in a 12-fold pickling register. The pickling
register consists of 4 registers, which are connected in series.
Each register channel contains a plus electrode made of titanium and a
minus electrode made of stainless steel.
The electrodes are U-shaped and the individual wire is passed through
them without contact. Direct current is conducted through the
electrodes, the positively charged current is transferred from the
plus electrode to the minus electrode via the wire.
The channels of the individual registers are completely flooded with
the pickling medium as a cascade by 2 pumps.
The gas bubbles that develop on the wire cause the wire to be cleaned.
The channels of the individual registers are completely flooded with
the pickling medium as a cascade by 2 pumps.
The pickling medium can be either phosphoric or sulphuric acid or a
mixture of both.
The concentration depends on the surface condition of the wire,
primarily stearates (drawing agent residues) should be removed.
Certain acid concentrations should not be exceeded, see the system
manufacturer´s instructions.
The pickling unit is heated to increase cleaning and pickling
performance, max. 70°C is possible. The optimum temperature depends
on the condition of the wire surface.
The direct current at each individual wire channel can be regulated
separately, a maximum of 250 A is possible. The direct current is
converted via 12 dry rectifiers.
The current intensity must be set according to the condition and
contamination of the wires. The procedure is described in Chapter II,
B.03 Electrochemical wire cleaning.
The pickling medium is permanently skimmed off by 2 piston diaphragm
pumps in order to filter out the filth, dirt and stearates via a belt
filter. The cleaned medium flows back into the pickling tank.
Pickling residues carried along by the wire are blown off in nozzle
block I.
The wire is then pre-rinsed in the cascade rinse - pointed rinse to
rinse off any pickling residues carried along.
The rinsing water is refreshed by the water overflow from rinsing
stage II.
The fill level in rinsing stage II is monitored and automatically
topped up.
The wire is rinsed in cascade rinse II.
The wire is blown dry after cascade rinse II.
Cascade sinks I and II are fed via 2 separate sinks. The baths are
heated to improve the rinsing performance. The maximum rinsing bath
temperature is 60°C.
To avoid waste water, the water is replenished via sink II; sink I is
fed from the overflow of sink II.
The conductivity value (salt content) of sink II is measured
continuously; an alarm is triggered if the conductivity value is
exceeded. The conductivity value can be preset on the conductivity
meter.
The media levels are monitored in the system.
The tanks are filled via an electro-pneumatic directional control
valve,
If the level falls below minimum level I: the heating is switched
off
If the level falls below minimum level II: the pumps are switched
off
Ultrasonic wire rinsing device
The electrochemically cleaned wire is cleaned in the ultrasonic
rinsing device.
The wires pass through a sonication tank which is permanently flooded
from a storage tank
The overflow from the sonication tank flows back into the supply
tank.
The cleaning medium in the ultrasonic tank is heated to 80°C
The ultrasound creates cavitation on the wire surface and thus
supports the post-cleaning process
The post-cleaned wire is then blown dry by air nozzles before being
heated in the inductive wire heating system.
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