DE1004711B - Arrangement for regulation depending on the size of the loop formed by a continuous wire or band-shaped good - Google Patents

Description

GERMAN

With continuous rolling mills for the production of wires, strips or profiles and analog industrial processes, especially in the paper, plastics and rubber industries, the task is the deflection or the size of the loops formed between two roll stands or the like of the goods passing through within predetermined limits. In view of the high speed, with which the good moves, the result is a regulation or rapid influencing that is as free of inertia as possible at. In order to keep the manufacturing tolerances of the goods small, especially with metal profiles, its mechanical stress should be avoided as far as possible by the control organs. aside from that Continuous regulation is sought to ensure that the sling runs smoothly and so to relieve the entire system of shock loads as far as possible.

For this purpose, a so-called capacitive loop control has been used for electrically conductive material, with an electrode facing the loop. The size of the capacity between these The electrode and the loop, which changes with the size of the loop, are used to influence the Speed of the motor driving the material passing through.

In Fig. 1 is a schematic example of such a known capacitive loop control at illustrated a strip rolling mill. The strip-shaped rolling stock 30 runs between two roll stands 10, 20 through and forms a loop that sags downwards. There is a measuring electrode under the loop 15 arranged, together with the rolling stock 30 passing through, which acts as a counter electrode serves, forms a capacitor. This lies in a medium- or high-frequency measuring circuit, that of a frequency generator housed at 16 is fed. The capacitance of the capacitor changes with the size of the slack in the loop. In the device 16 is also a measuring and control device housed, which converts the change in capacitance into a voltage change and the excitation field of the drive motor 21 for the roll stand 20 according to the size of the measuring capacity adjusts so that the distance of the loop from the measuring electrode 15 remains constant. It is also known to include a capacitor in the measuring circuit, which consists of two adjacent There is electrode plates, which are capacitively coupled to one another by the goods passing by are. When the loop size changes, the degree of coupling between the two changes Electrodes and thus the capacitance of the measuring circuit.

Arrangement for the regulation as a function of the size of the wire or band-shaped material passing through
formed noose

Applicant:

Siemens-Schuckertwerke

Aktiengesellschaft,

Berlin and Erlangen,

Erlangen, Werner-von-Siemens-Str. 50

Dipl.-Iiig. Hans Poschner

and Dipl.-Ing. Hans-Günter Vogelsang, Erlangen,
have been named as inventors

Such measuring arrangements have the disadvantage that they are very sensitive to changes in the cross-section of the goods passing through and also to lateral migration of the same from the normal position, because in both cases the measuring capacity changes and simulates a change in the loop size, so that an incorrect regulation occurs. For this reason, the invention proposes an arrangement in which these possible errors are turned off. This advantage is achieved according to the invention in that two measuring electrodes or pairs of measuring electrodes in the manner of a differential capacitor - in the direction of the loop deflection seen - are arranged one behind the other and assigned to the side of the passing good that when the loop size changes, the capacities of the two measuring electrode arrangements are reversed Change senses.

With reference to FIGS. 2 to 5, which show a few possible exemplary embodiments in a schematic representation show, the invention will be explained in more detail.

Fig. 2 shows a cross section through a measuring arrangement in a wire rolling mill. At 30 that is wire-shaped rolling stock denotes; its normal position is 0, a position if the loop is too shallow is 1 and a position if the loop is too large is denoted by 2. Are in the direction of the loop deflection two measuring electrode arrangements are available, each of which consists of two galvanically connected electrodes 31, 32 and 33, 34 consists. These electrode

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Pairs are arranged one above the other so that the deflectors are provided. For such cases is also Loop level of the running material between the proposed, the electrodes themselves as massive Electrode pairs is located. So the arrangement seems to carry out steel plates, all possibly like a differential capacitor, d. H. in the event of mechanical stresses ge loop deflection upwards increases the capacity 5 and after faults in which the of the passing material 30 against the electrode gap between the electrodes of the back pair 31, 32 to and the capacity can be completely filled against the rolled-in rolling stock, Trodenpaar 33, 34 from, while in the case of a loop they are folded back or pulled out upwards deflection downwards the changes in capacitance in the can.

reverse sense. The capacities of the io In Fig. 2, 39 is a tub (e.g. a top and the lower pair of electrodes against the masonry shaft or wire mesh walls), Rolled stock form parts of oscillating circles, which are in the electrode arrangement and the loop the devices 35j 36 with or without power control and which delimit these parts from the outside, are arranged stronger level. The capacitance sands - such a mechanical or electrical shield are in the devices 35, 36 by known 15 mung is useful to prevent foreign funds transformed into stresses. The output bodies influence the control from the outside voltages of the devices 35, 36 are a power can. The electrodes can be placed in the side wall amplifiers 37 and control this embedded in counter-fertilization of the shaft or on this clock circuit. The power amplifier can be attached.

for example a magnetic amplifier or a tube 20 Fig. 3 shows a somewhat modified arrangement, be amplifiers. The arrangement acts in such a way that the two pairs of electrodes 41, 42 and 43, 44 form a capacitor on each of them in the normal position 0 of the rolling stock 30. The loop output terminals of the power amplifier 37 the level of the goods passing through, which in this case voltage 0 prevails. When a deflection is shown in the form of a strip and is denoted by 40, a direct voltage occurs at one end (1) and at 35, as in FIG. Such an arrangement can be so-DC voltage in the opposite sense. Probably with an electrically conductive good, which is the grounded output DC voltage of the power amplifier, as well as with insulating good, such as paper, is a measure of the size and direction of the rubber, plastic, use. In the former case, the rolling stock is steered. It can therefore act as a control electrode in a known manner to influence the Ge in the electric field of the capacitors 41, 42 or the speed of one of the two roll stands 43, 44; In the latter case, a local motor is used or used to cause the change in the dielectric, which also causes the speed difference or the speed to change the capacitance and to control a regulation ratio of the two. In addition, the position of the running goods according to the above can of course also be made possible, as is known per se, the principle described. These Anordselbsttätig the other engines of the rolling line voltage has the \ ^r enefits an independence arise appropriate response, lest unwanted control from the cross section of the running rigging and sling changes to a different location of the independence of lateral displacements rolling mill. 40 of the loop level.

In that, in the direction of the loop deflection, FIGS. 4 and 5 show in elevation and plan two measuring electrodes are arranged, the capacitance of which is an arrangement with approximately horizontal loop elements against the earth or the earthed good with each other, as they are, for example, on edge according to the differential method over a subsequent lying rolled section with unequal bending push-pull stage are compared, the advantage 45 moments is used. 50 is the rolling stock; 10, 20 are achieved that the zero position of the loop independently turn the two roll stands; with 51, 52 are of the rolling stock cross-section. The division of the two plate electrodes denotes that in one off-measuring electrodes in galvanically connected electrode recess 53 of the horizontal or slightly inclined pairs, between which the passing material is arranged next to the rolling line loop table is located, has the advantage that lateral walks 50 54 are accommodated. You can use an insulating des Good with practically no influence on the medium filling made of, for example, ceramic material stay result. This is important if recess 53 is to be embedded. The insulating material filling hanging arrangements in which deviations can of course also be omitted if one are to be measured upwards and downwards, while suitable constructive means ensure that There are lateral deviations without any influence on the galvanic connection between the rolling stock Measurement result should remain. The intended position of the loop and the plates is omitted. The rest of the electric can be changed both by changing the electrode part of the arrangement is the same as with the arrangement, d. H. by moving the elec- trodes together according to FIG. 2. A subdivision of the electrodes upwards or downwards, as well as on pure electrodes, is superfluous in this case, since the loop centric Paths through setting members on the devices 60 plane through the table surface is clearly defined. Set 35 to 37. In all of the exemplary embodiments described

To a galvanic contact of the rolling stock, how it can be advantageous to influence the

she z. B. can occur in the event of malfunctions, with the characteristics of the electrode arrangement

To avoid measuring electrodes, you can, as in Fig. 2 controlled the electrodes in the direction of the controller

at the electrodes 31 to 34 it is indicated that the loop deflection has a different width

the latter with an insulating, for example kera- give, as indicated for example in FIG. 6.

mix wrapping provided. In cases where instead or in addition, the distance can also be used

It must be expected that the mechanical electrodes of the loop plane in the direction

Stresses of such sheaths may be too great as the loop deflection may be different

instead, a suitable stable 70 is indicated in FIG. 7.

Claims (8)

Patent claims: 1. Arrangement for regulation depending on the size of a continuous wire-like or band-shaped good formed loop, which one in the measuring circuit of a control device influences lying capacitance, characterized in that two measuring electrodes or measuring electrode pairs in the manner of a differential capacitor - in the direction of the loop deflection seen - arranged one behind the other and laterally assigned to the goods passing through in such a way that that when the loop size changes, the capacities of the two measuring electrode arrangements change in the opposite sense. 2. Arrangement according to claim 1 with two pairs of electrodes, characterized in that the electrodes of each pair of electrodes are connected in parallel with each other and together with the between them passing through a capacitor lying in the measuring circuit of the control device form. 3. Arrangement according to claim 1 with two pairs of electrodes, characterized in that the Electrodes of each electrode pair a capacitor lying in the measuring circuit of the control device form whose capacity is determined by the position of the goods passing between them. 4. Arrangement according to claim 1, characterized in that two electrodes are advantageous in one with ceramic insulating material filled recess of a known per se Way horizontally or slightly inclined next to the rolling line existing and the laterally deflected Loop leading loop tables are arranged one behind the other. 5. Arrangement according to claim 1, characterized in that the electrodes at least the side facing the passing material with a galvanic contact with it Insulation that protects the material passing through and is expediently made of ceramic material are covered. 6. Arrangement according to claim 1 to 3 for rolling mills, characterized in that the electrodes are embedded in protective walls arranged on both sides of the loop "of the rolling stock. 7. Arrangement according to claim 1 to 3, characterized in that the electrodes are strong There are steel plates that are interchangeable, can be folded back to the side or can be pulled out upwards are. 8. Arrangement according to claim 1 to 4, characterized in that the electrodes for influencing the control characteristic in the direction of the loop deflection has a different width and / or have a different distance from the loop plane. Considered publications:
German Patent No. 690 617;
British Patent No. 642,490;
U.S. Patent Nos. 2,512,372, 2,613,338. 1 sheet of drawings © 609 840/335 3.57