JPH0465888B2 - - Google Patents

Abstract

A roller assembly for supplying electrical power to a plant for the continuous annealing of wire includes rollers which each have an electrically conductive sleeve and contacts which are slidable on the sleeve and connected to a voltage source. - The sleeve has several electrically conductive segments which are insulated from each other. The contacts engage an angular portion of the sleeve which is within the arc of winding of the wire and has an angular extent such that a voltage is not applied to the segments at the ends of the arc of winding.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a roller assembly for powering a continuous annealing installation for wire, especially steel wire, with a heating chamber located downstream of a wire drawing machine, comprising:
A device is provided for applying a potential difference between a pair of successive rollers that drives the wire so as to pass a current through the wire to anneal it by the Joule effect.

PRIOR ART AND PROBLEMS Each drive roller of the wire has an electrically conductive sleeve rotatably supported and energized by a sliding contact, the contact between each roller and the wire to be processed being Occurs along the arc of the sleeve.

In the area where the wire approaches and moves away from each roller, especially in the latter area, extra current is generated which causes sparks. The sparks cause surface damage to the wire being processed, thereby reducing its shine and market value.

OBJECTS AND SUMMARY OF THE INVENTION The object of the invention is to provide a power supply roller assembly in which the above-mentioned disadvantages can be eliminated.

To this end, the present invention comprises a rotatably supported wire-driven roller having an electrically conductive sleeve energized by electrical contacts;
a power supply for driving the wire in a continuous wire annealing installation of the type described above, wherein the contacts slide over the sleeve and are connected to a power supply, the contact between the roller and the wire occurring on the arc of the sleeve; a roller assembly for use in a vehicle, the assembly comprising:
a sleeve having a plurality of electrically conductive segments insulated from each other and having an angular extent such that the sliding contact lies within the arc of the winding of wire and does not apply a voltage to the segment at the end of the arc; It is characterized by engaging with the angular part of.

Other features and advantages will become clear from the following description of preferred embodiments of the invention with reference to the accompanying drawings.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, a power supply roller of the present invention is indicated generally at 1.

The roller is intended for use in a wire drawing and annealing installation 2 (FIG. 1) for wire 3.

The equipment 2 includes a wire unwinding device 4 and a wire drawing machine 5.
, an annealing device 6, and a wire winding device 7.

The annealing device 6 is composed of a heating chamber 8 and a subsequent cooling chamber 9.

Two successive pairs of rollers 1 are placed in a heating chamber 8 and a potential difference is applied to each pair of rollers so as to cause a current flow to anneal the wire 3 by the Joule effect.

As shown in FIG. 2, each roller 1 has a sleeve 1
0, the wire 3 is wound over the arc of the sleeve 10.

The sleeve 10 is of a construction similar to that of commutators of the type used in dynamoelectric machines and has a plurality of parts insulated from each other by an annular insulating part 11 surrounding the central metal part 11a of the roller 1. It has a conductive segment 12 of .

The segment 12 forms part of a bar 12a arranged parallel to the axis of the roller 1 and embedded in the insulating part 11.

The central metal portion 11a of the roller 1 is rotatably supported by a support structure (not shown).

The sliding contact 13 engages in the sleeve 10 of the roller 1 and is constituted, for example, by a graphite brush which is slidable in an arcuate support structure 14 and is acted upon by a spring, not shown. Contact 13 is connected in a known manner to a common power source, not shown.

The contact 13 engages an angular portion of the sleeve 10 that lies within the arc of the winding of the wire 3 in the sleeve 10 and has an angular extent slightly smaller than the extent of the arc.

The contacts 13 have two circumferential rows of contacts, each row of contacts uniformly offset from the other rows of contacts over the entire angular portion of the sleeve 10.

The arcuate support structure 14 of the contact 13 is connected to the screw 15
is attached to a ring 14a fixed to the support structure (not shown) of the roller 1 by a screw 15.
are inserted into circumferential slots 16 in ring 14a. It is therefore possible to adjust the angular position of all contacts 13 relative to the arc of contact between the wire 3 and the sleeve 10 of the roller 1.

The above-described structure allows the contacts 13 to apply voltage at any moment only to those segments 12 that lie within the arc of the winding of the wire 3 and on angular parts of the roller 1 that have an angular extent smaller than the angular extent of said arc. , so that at the beginning of the winding arc, wire 3
contacts the unenergized segment 12; similarly, at the end of the winding arc, the wire moves away from the unenergized segment 12, so that the wire touches the winding roller. The objective of eliminating the drawbacks due to sparks on approach and departure is achieved.

[Brief explanation of the drawing]

FIG. 1 shows a diagram of the installation in which the roller of the invention is used, and FIG. 2 shows a detailed perspective view of the roller assembly of the invention in which the wire to be heat treated is engaged. DESCRIPTION OF SYMBOLS 1... Power supply roller, 2... Wire drawing annealing equipment, 3... Wire, 10... Sleeve, 12...
Segment, 13... Sliding contact, 14... Arc-shaped support structure, 14a... Ring, 15... Screw,
16...Slot.

Claims (1)

Claims: 1. A device for applying a potential difference between successive pairs of rollers 1 driving the wire 3 so as to heat the wire 3 by the Joule effect; a wire 3 of the type in which the roller 1 is rotatably supported and has an electrically conductive sleeve 10 energized by contacts 13, which contacts 13 slide over the sleeve and are connected to a power source; In particular, in a roller assembly for power supply of a continuous annealing installation 2 for steel wire, said sleeve 10 has a plurality of electrically conductive segments 12 which are insulated from each other and said sliding contacts 13
engages an angular portion of the sleeve within the arc of the winding of the wire 3 and having an angular range such that no voltage is applied to the segment 12 at the end of the winding arc. Three-dimensional. 2. Claim 1, characterized in that the sliding contact 13 engages in an angular part of the sleeve of the roller 1 which is slightly smaller than the extent of the arc of winding of the wire 3 on the roller 1 driving the wire. Assemblies described in Section. 3. A device 15, in which the sliding contact 13 is constituted by a radially slidable brush in a support structure 14, 14a surrounding the sleeve of the roller 1, and for adjusting the angular position of the support structure 14, 14a; , 16 are provided. 4 the support structure internally supports the brush 13;
4. Assembly according to claim 3, characterized in that it comprises a slidable arcuate portion (14) and a disc (14a) having an arcuate slot (16) in which a fixing screw (15) engages.