DE3226596A1 - Immersion drum for the electroplating surface treatment of bulk goods which can be poured - Google Patents

Abstract

An immersion drum is proposed, for making variable alternating contact, for the galvanic surface treatment of bulk goods which can be poured. This immersion drum (1) is placed on two angled or bent supporting arms (2), such that it can rotate, with fluid-proof bearings. These current-conducting supporting arms (21, 31) are in this case in each case constructed as tubes in which a further current conductor (23, 33) is arranged in an insulated manner, which current conductor is electrically connected to individual contacts (61 and 63) which are arranged coaxially over the circumference in the interior of the drum, at constant intervals. In this case, a controller (5, 6) which is synchronised to the drive (4) of the drum is provided outside the drum (1), via which controller the current is supplied in an alternating manner in each case to the individual contacts and contact groups (61-64). Such an immersion drum makes it possible to have four circuits which are isolated from one another and can in each case be reversed and disconnected by means of a controller which is located outside the drum. It is thus possible to reverse the polarity of the individual electrical contacts which are located in the interior of the drum, and the contacts which are in each case connected to form groups, a plurality of times at relatively short intervals, to supply them with different current intensities or voltages, or to hold them without power being applied. <IMAGE>

Description

Plants for electroplating

"Immersion drum for galvanic surface treatment of pourable Bulk goods "The invention relates to a dip drum for galvanic surface treatment of loose bulk goods according to the preamble of claim 1. Such polygonal immersion drums for electroplating and electrolytic treatment of Bulky bulk goods are known, for example, from US Pat. No. 3,432,419. The bent support arms are covered with their bearings on the drum shielded liquid-tight with a flexible plastic bellows. the Power is supplied via the massive trained support arm, about the bearings and through contact strips distributed over the circumference inside the drum or rows of buttons in contact with the goods. A disadvantage of such a drum design consists in the fact that when the drum rotates, the items that appear cyclically from the goods Contact strips take part in the electroplating stepped up and with precipitation metal be coated, which from time to time chemically, electrochemically or mechanically must be removed, otherwise the drum would be destroyed or the sensitive one Goods can be damaged.

It has therefore already been proposed by a collector-like Distributor or an intermittent one by means of spring contacts or rollers sliding on segments Generate power supply in such a way that the usLer of the goods lying Kcntaktgeber are energized while the exposed contacts are de-energized. At a such a design, the deposition on the contact strips is much less, but not completely canceled because the contact strips are in the batch also take part in the electroplating.

It has also been proposed (US-PS 3 282 819) the contact strips, which are outside of the goods to be coated are located by To convert the polarity reversal of the corresponding power transmission segments as anodes, the metal previously deposited on these contacts after surfacing to be removed from the goods again. The disadvantage of such an alternating polarity reversal Contact strips can be seen in the fact that as a result of the usually large currents Significant tear-off sparks occur on the switching segments or switching devices, which the switching devices and possibly the entire drum bearing quickly destroy.

A method has therefore been proposed (German patent application P 32 13 511.4), after each one on the anodically polarized contacts different, preferably higher voltages for the cathodically polarized contacts, should be created. With such a procedure there is a complete detachment of the metal deposited on the contacts.

The object of the invention is to provide a submersible drum of the initially mentioned to propose the type mentioned, in which a variable changeover contact is possible is, and in which the power transmission occurs in conventional constructions Disadvantages of tear-off sparks or the like. be avoided.

The object of the invention is achieved by a diving drum with all Features of claim 1.

Such a diving drum according to the invention enables four of each other separate circuits, each by one located outside the drum Control can be switched or switched off. It is therefore possible to use the individual electrical contacts located inside the drum or the to change the polarity several times at relatively short intervals between contacts connected to groups, to be charged with different currents or voltages or to be de-energized keep. The power transmission from the support arm or the further received therein isolated Conductor is carried out in a slide bearing, if necessary with resilient contact elements.

There is also the possibility of creating additional circuits by that insulates one or more conductive pipes coaxially around the hollow support arms are arranged, each with individual contacts or contact groups inside the drum are in electrical connection.

In a further embodiment of the invention, a submersible drum is proposed, which is characterized in that on the horizontal ends of the hollow support arms with a metal slide bearing the drum with a metal sleeve rotatable is placed, which metal socket with one or more of the electrical contacts is connected in an electrically conductive manner in the interior of the drum via straps. Preferably there is a flexible cable inside each of these electrically conductive support arms, preferably with a circular cross-section. guided.

at the horizontal end of which a metal pin is provided on which resilient sliding contacts connected to the drum are rotatably placed - the with one or more of the electrical contacts arranged inside the drum are electrically connected.

The invention is based on an illustrated embodiment explained in more detail below. They show: FIG. 1 one on a supporting frame with its two support arms suspended immersion drum in longitudinal section, Fig. 2 is a plan view to the entire device in FIG. 1.

FIG. 3 shows a section along the line A - A in FIG. 1 and FIG. 4 shows a section along the line B - B in FIG. 1.

Reference is first made to FIGS. 1 and 2. On a traverse 8 is a polygonal one with its support arms designated as a whole by the numbers 2 and 3, respectively Immersion drum 1 held. As Figure 2 shows, this cross member 8 rests on the supports 91 of a galvanic bath 9.

The immersion drum 1 is formed from the corner bars 15 with each other connected wall panels 16. On the front side, the drum 1 is through the one double wall forming face plates 11 and 12 complete.

The drum drive 4, which has a spur gear, is seated on the traverse 8 41, an output 42 and the spur gear 13 drives the drum 1. From output 42 a control shaft 43 goes off, which is via an interposed spur gear 51 synchronously with the drive causes the control indicated as a whole by the number 5.

The two support arms 2 and 3 of the drum 1 are designed as conductive tubes 21 and 31 respectively. The drum is on its horizontal pipe ends 22 and 32, respectively 1 rotatably mounted with a plain bearing 28 and 38, respectively. About this plain bearing and the flange sockets 29, power is transmitted via power strips 281 and 381 to electrical contact bars 61 - 64 which are distributed over the circumference inside the drum are arranged. The tubes 21 and 31 are liquid-tight, respectively enveloped with a bellows 25 or 35, which is approximately cuff-like on the drum bearing seals. On the other side, each bellows is sealed on tubes 26 or 36 attached, which are each connected to the traverse 8.

Inside the hollow support arms 21 and 31 are received isolated in each case a further conductor 23 or 33 an.dessen protruding from the pipes Part in each case a metal pin 24 or 34 is provided. On this metal spigot When the drum 1 rotates, resilient multi-contacts 241 or 341 slide, which in turn are connected to individual contact groups 61 or 63 are connected in an electrically conductive manner inside the drum 1.

The plain bearings and the current-transmitting means are each between the end plates 11 and 12 of the drum 1 kept sealed. The coverage of inside takes place via the blind socket 14. The flange sockets form the end to the outside 29

For alternating contacting of the individual contact rods 61 - 64, respectively in groups of two, external control takes place synchronously while the drum is moving to the drive 4. Via the control shaft 43 and the spur gear 51, for example in the controller 5, a circuit take place via camshafts or the like. The impulses of this Stening 5 are also switched to external switches via the control lines 52 6 led. These switches of a suitable type lead the corresponding current feeds 7 ', 7' 'via the conductors 21, 23 or 31, 33 to the individual contact rods or Rod groups 61 - 64 inside the drum.

The sectional views according to Figures 3 and 4 show in one Snapshot of the current electrical connection of individual contact rods with the Conductors.

The drum area in the lower area that receives the batch to be treated located contact rods 61 and 63 are on the current bands 242 and 342 with the conductors 23 and 33 connected. Contact rod groups 62 and 64 that are outside of the batch to be treated are located via the current bands 281 and 381 with the electrically conductive support tubes 21 and 31, respectively. By appropriate control of on the outside, these corresponding contact rod groups can each be independent of one another with currents in different directions of different strengths or voltages applied or kept de-energized.

Compilation of the reference numerals 1 drum 11 face plate 12 face plate 13 Spur gear 14 Blind socket 15 Corner rod 16 Wall plate 2 Support arm 21 Tube 22 Tube end 23 Conductor 24 Spigot 241 Multi-contact t 242 Power strip 25 Bellows 26 Tube 27 Flange socket 28 plain bearing 281 power strip 29 flange socket 3 support arm 31 tube 32 Tube end 33 current conductor 34 spigot 341 multi-contact 342 current band 35 Bellows 36 Tube 38 Plain bearing 381 Power strip 4 drive 41 Spur gear 42 output 43 control shaft 5 control 51 spur gear 52 control lines 6 switches 61 Contact rod 62 Contact rod 63 Contact rod 64 Contact rod 7 ', 7 "power supply 8 traverse 9 bath 91 support L e r s e i t e

Claims (5)

Patent claims 1 ,. Immersion drum for galvanic surface treatment of loose bulk goods that can be rotated with liquid-tight bearings on two angled or bent support arms is placed, with these support arms the power supply to coaxially over the circumference inside the drum at regular intervals arranged electrical contacts takes place, characterized in that the current-conducting Support arms (21, 31) are each designed as tubes in which a further current conductor (23,33) is arranged in an isolated manner, with individual contacts (61 or 63) of the drum (1) is in electrical communication, and. that outside the drum (1) a for Drive (4) of the drum synchronous control (5,6) is provided over which each the changing power supply to individual contacts or contact groups (61 - 64) he follows. 2. immersion drum according to claim 1, characterized in that isolated one or more conductive tubes are arranged coaxially around the hollow support arms are those with individual contacts or contact groups inside the drum in electrical Connected. 3. diving drum according to claim 1, characterized in that on the horizontal ends (22,32) of the hollow support arms (21,31) with a Metal sliding bearings (28, 38) are rotatably placed on the drum (1) with a metal bushing (27) is which metal socket (27) with one or more of the electrical contacts (61 - 64) connected in an electrically conductive manner inside the drum via current bands (281, 381) is. 4. Immersion drum according to one or more of the preceding claims, characterized in that inside the current-conducting support arms (21,31) in each case a flexible cable (23, 33) / preferably with a circular cross-section is, at the horizontal end of which a metal pin (24,34) is provided, au £ the resilient sciilif contacts (241,341) connected to the drum (1) are rotatably fitted are that with one or more of the arranged inside the drum electrical Contacts (61-64) are electrically connected. 5. Immersion drum according to one or more of the preceding claims, characterized in that the current-conducting support arms (21, 31) are liquid-tight are surrounded by a bellows (25) which seals the storage cuff-like.