DE1238499B - Device for the electrical heating of bars, billets, pipes, tapes or the like. Elongated workpieces of different lengths in direct current passage - Google Patents

Description

FEDERAL REPUBLII OF GERMANY DKtITSCBtS

PATENT OFFICE

EDITORIAL

Int. Q .:

German class:

Number:
File number:
Registration day:
Release day:

CZId

1238499
Λ 50718 VI a / 18 c
November 8, 1965
April 13, 1967

The invention relates to a device for the electrical heating of rods, billets, pipes, bandages or the like, elongated workpieces in the unmilled process. The device should be designed in such a way that workpieces of different types can also be treated without further ado.

In general, known devices of this type are constructed in such a way that only a certain workstile can be operated. It is also known to set up a device in such a way that workpieces of different lengths can be treated. In this case, two account spaces are provided which can be displaced against one another and between whose contacts the workpieces of different lengths are clamped for the purpose of heating. In this case, the power supply can consist of fixed rails; Then it is necessary to provide an additional contact in each contact carriage, which makes the contact with the Suomzuführachiene necessary in different positions ae $ Korttafctwagera. Additional contacts of this kind are undesirable in such devices because the raised currents in the contact jaws can lead to considerable heating.

For the power supply including the workpieces to be heated results in a Leitefsctikife, their inductance with increasing HetzguÜSnge becomes bigger. That is in view of one Even mess with different factory backlengths undesirable

It is also known to each of the contact cars Connect to the transformer using flexible cables. Although this avoids an additional contact ts in each contact carriage, it is but necessary to drive a mechanical effort for the guidance of the cable.

The purpose of the invention is to overcome the disadvantages of the known Avoid facilities by creating a device that is simple in construction is and also allowed to influence the inductances of the supply lines in a useful way, namely preferably in the sense that at constant transformer voltage the throughput of the heated Materials »remains constant.

This object is achieved according to the invention in that the contact carriages are connected to the transformer via busbars with the zukitungskabclsträngcn, short rails being connected to one carriage and long rails to the other carriage
Rods, billets, tubes, strips or the like.
elongated workpieces »different
Length in direct current passage

Applicant:

AEG-EIothcrm G. mb H.,
Remscbeid-Haaten, Hammesberger Str. 31

Named as inventor:
Herbert Geisel, Rcmschcid-LüttringhauEcn;
Dipl.-lag. Leontwrd Springob, Rcmsctirid;
Edgar Stengel, Wuppertal-Croacnberg

correspond to the largest workloads. the Rails can be moved parallel to each other when the contact carriages are on the length of the workpiece can be set.

The Bexibkn Kabdstrüngc are advantageous connected to the busbars on one side of the device in the area of one of the contact carriages. In this way it is achieved that the central space between the carriages is free for the Supply and removal of the workpieces to be heated.

The fkxibkn harness counter when hiring the car closely adjacent to the greatest possible factory length parallel to each other. But if the wagons are adjusted to smaller throwing pieces, so will according to the invention ensured that the distance between the cable loops in the area of the Schicnenanschluss points to change the inductance of the supply line is increased. This enlargement takes place preferably in the sense that with constant

• ntmrm

Transformer voltage the throughput of heated material in tons per hour kept constant can be.

To bring about this adjustment of the distance, one or more curved cable guide pieces be provided, the different workpiece lengths and thus different Car positions allows a more or less strong merging of the cable harnesses. In

Fig. 1 is a schematic representation of a preferred embodiment of the invention, and in

A b b. 2 shows a perspective view of an appropriate connector for the cable looms; in

A b b. 3 shows a further embodiment for the connection of the cable looms.

In the example chosen, a rod 1 with the length L is clamped between the contact groups 2. These contact groups 2 are located in the contact carriages 3 and 4, which can be moved relative to one another. The carriage 3 is provided with the busbars 5, which are guided parallel to the workpiece 1.

The length of these rails 5 must be chosen so that it corresponds to the largest workpiece length L. In the illustration in Fig. 1 it is assumed that the workpiece 1 has the maximum length L that can be treated in the device. The busbars 6, which are guided parallel to the rails 5 or the workpiece 1, are provided on the carriage 4. The rails 5 and 6 are connected to the Kontaktgrupperi 2 by means of flexible connecting pieces in order to enable a movement of the contacts within the contact carriage.

The rails 5 and 6 are connected to the transformer 9 by supply cable harnesses 7 and 8. The cable 7 is by means of the connector 12 with the rails 5 and the cable harness 8 by means of the connection piece 13 is connected to the rails 6.

In the position of the two contact carriages 3 and 4 shown in Fig. 1, the two cable strands 7 and 8 are at a distance from one another. This distance α corresponds to the lowest inductance that can occur in the supply line, specifically for the case that the length of the rod 1 has the greatest value shown here. If a rod 1 with a shorter length is to be heated, the two carriages 3 and 4 must move towards one another, which means that the connecting pieces 12 and 13 move apart and, as a result, the distance α between the supply cable looms 7 and 8 increases. This has the consequence that the inductance between the cable strands 7 and 8 is greater, and as a result, with a constant transformer voltage, the voltage at the contacts 2 is lower than with the maximum rod length. This already ensures to a certain extent that the throughput of heated material does not increase inadmissibly as the bar length decreases.

This advantageous property of the device according to the invention can be further improved by pressure pieces 10 and 11. These pressure pieces can be pivoted about the pivot points 14 and 15, and it is also possible to move these pivot points in the direction of the arrows 16 and 17. As a result, the curves 18 and 19 come into contact with the supply cables 7 and 8. When the connecting pieces 12 and 12 move apart as described, the cables 7 and 8 are raised. They take the pressure pieces 10 and 11 with them, and according to the curve shape 18/19, the strands are brought closer to one another or kept at a distance α which causes a certain inductance. In this way it is possible to set the entire device to a specific inductance. The procedure here is preferably such that with a constant transformer voltage the throughput of heated material in tons per hour is constant.

It is particularly useful to arrange the busbars 5 and 6 in pairs one above the other, as this from A b b. 2 can be seen. Here it is advantageous to use a cross connection 12/13 that the Has the shape of a cross piece.

While in the arrangement according to Fig. 1, the busbars 5 and 6 parallel in vertical planes are arranged to each other, it can also be useful to parallel them in horizontal planes to each other, as shown in the perspective partial representation in A b b. 3 is indicated. In this case, the cable strands 7 and 8 are side by side in the longitudinal direction of the rails 5 and 6 attached. When the connecting pieces 12 and 13 move apart, the cable strands move 7 and 8 like scissors past each other, whereby the inductance with constant distance the supply line is changed in the desired sense.

Claims (6)

Patent claims: 1. Device for the electrical heating of bars, billets, tubes, strips or the same elongated workpieces of different lengths in direct current passage, where the contacts (contact groups) between which the workpieces of different lengths are to be clamped, are located in movable contact trolleys, characterized that the contact carriages (3 and 4) via busbars (5 and 6) with the supply cable harnesses (7/8) are connected to the transformer, with one carriage (4) short rails (6) and the other carriage (3) the long rails (5) corresponding to the largest workpiece lengths are firmly connected and can be moved parallel to each other when the contact carriage is set to the workpiece length will. 2. Device according to claim 1, characterized in that the flexible cable strands (7/8) are connected to the busbars (5 and 6) on one side of the device. 3. Apparatus according to claim 1 and 2, characterized in that the flexible cable strands (7 and 8) when setting the carriages (3 and 4) are closely parallel to each other on the largest workpiece length and when setting the carriage (3 and 4) on smaller workpiece lengths the distance (a) between the cable strands (7 and 8) in the area of the rail connection points to change the inductance of the supply line is increased. 4. Apparatus according to claim 3, characterized in that at least one of the cable strands (7 or S) placed over adjustable curved cable guide pieces (10 or 11) is, so that with different workpiece lengths (L), d. H. different car positions, a more or less strong merging of the cable strands (7 and 8) allows will. 5. Apparatus according to claim 4, characterized in that the busbar pairs (5 and 6) arranged one above the other and each pair with one another by means of cross pieces (12 and 13) connected is. 6. Apparatus according to claim 3, characterized in that that when the busbars (5 or 6) are arranged parallel to one another in a horizontal plane, the supply cable looms are attached to the rails side by side in the longitudinal direction. For this 1 sheet of drawings 709 549/280 4.67