2012 Wire cleaning machine

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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