Surface treatment installation for metallic parts, particularly by electrolysis

Abstract

Surface treatment installation ( 100 ) for metallic parts including an electrolytic cell ( 1 ) comprising a treatment liquid ( 20 ) in which the parts to be treated are immersed, characterised in that the parts to be treated are fixed on a pivoting drum ( 2 ) such that there is at least one rotation movement for each part in the cell, and in that the cell ( 1 ) comprises at least two electrodes ( 8 a, 8 b ), while the drum is powered by an electrical power supply with polarity opposite to the electrode polarity, through at least one contact pad that is brought into contact on the drum drive ring.

1 . A treatment installation for treating a surface of metal parts, comprising an electrolysis vat containing a treatment liquid in which the parts to be treated are immersed, wherein the parts to be treated are fixed to a drum which is pivotably mounted, said vat comprising rotating means for rotating said drum so that said drum makes each part in the vat undergo a rotation movement, wherein vat comprises at least two electrodes, and wherein the drum is supplied with electric current of opposite polarity to that of the electrodes by means of a set of contact pads which are brought into contact with a drive ring driving the drum. 
     
     
         2 . The treatment installation as claimed in  claim 1 , wherein the vat comprises a set of two times fifteen pads. 
     
     
         3 . The treatment installation as claimed in  claim 2 , wherein the electrical contact with the drum takes place by sandwiching the drive ring between two series of fifteen pads. 
     
     
         4 . The treatment installation as claimed in  claim 3 , wherein the contact pads mounted so as to move translationally toward flanges of the drive ring and are pressed against the corresponding face of said flanges bye resilient means. 
     
     
         5 . The treatment installations as claimed in  claim 4 , wherein two lateral successions of pads are arranged in form of a circular arc having for center the center of pivoting of the drum, and wherein each pad is pressed against the corresponding flange by a spring. 
     
     
         6 . The treatment installation as claimed in  claim 5 , wherein each of the contact pads is made of graphite and is connected to a connecting means selected from the group consisting of cables and copper braids, said connecting means being connected to a power supply. 
     
     
         7 . The treatment installation as claimed in  claim 1 , wherein an external periphery of the drum comprises a succession of slideways intended for slidingly receiving the cassettes capable to support the parts to be treated. 
     
     
         8 . The treatment installation as claimed in  claim 7 , wherein the slideways are equipped with flexible contact blades that are fixed to the slideways so as to transmit the electrical contact of the slideway to the corresponding cassette and therefore to the parts that are fixed thereto, thus enabling an electrolysis treatment to be carried out. 
     
     
         9 . The treatment installation as claimed in  claim 4 , wherein the vats includes a motor for rotating the pivoting drum said motor cooperating by means of a toothed wheel with a succession of peg, which are mounted in mutually parallel arrangement, between the two flanges, said flanges forming of one of the sidewalls of the drum. 
     
     
         10 . The treatment installation as claimed in  claim 1 , wherein the vat has two electrodes capable to be connected to either a negative or positive polarity, whereas the drum is supplied with the opposite polarity. 
     
     
         11 . The treatment installation as claimed in  claim 10 , wherein the electrodes consist of aluminum plates.