DE2110539B2 - Control device on a rolling mill to influence the thickness of the rolling stock - Google Patents

Description

50

The invention relates to a control device according to the preamble of claim 1.

Such a control device is known, for example, from AT-PS 2 55 583. This known device is used as a whole for regulating the thickness of rolling stock by adjusting the rolls, i.e. for regulating fluctuations in the thickness of the rolling stock as a result of changing influencing variables. For ^M acceleration of the thickness control is also resorted to the required for fine compensation of thickness variations readjustment to a feedforward control thereby, detected in the interference prior to entry of the rolling stock in the roll stand and can be considered as immediately upon entry of the rolling stock into the rolling stand.

However, this known control device is used

not to adjust the thickness of the rolling stock according to a new target value without interrupting the To change the rolling process. To do this, the operating personnel must turn off the rolling mill or the rolling speed change to a very low value and then adjust the thickness of the rollers accordingly change the new setpoint. In modern continuously operating rolling mills, however, this is the case rear end of a leading belt with the leading end of a following belt before entering the Rolling mill welded and rolled so as it were an endless belt, so that an interruption of the Rolling mill operation would have to take place during the rolling of the rolling stock, apart from the Migration of the effectiveness of the rolling mill leads to unmistakable disruptive influences and thus among all Circumstances should be avoided.

If the thickness of the rolling stock is changed at high rolling speed, even a small one can Change in thickness or the timing of the change in thickness a large deviation of the Belt tension result, which not only results in a large proportion of the rolled strip with deviating Thickness is generated, but also a rupture of the tape can occur.

The object of the invention is therefore to provide a control device for a rolling mill with which an adjustment of the thickness, in particular one continuously rolling strip running through to a new target value during the Waizbetriebes at high speed is possible without reducing the rolling speed, with fluctuations in the strip tension as possible should be largely avoided.

This object is achieved according to the invention by the characterizing features of claim 1.

This ensures that during the rolling process with undiminished rolling speed when drawing off one and the same raw material reel or when processing tied tapes uniform thickness products of different tape thicknesses can be produced. This is an advantageous one One-man operation possible, with no particular skill for bringing about the New hiring is to be requested

Appropriate refinements of the invention emerge from the subclaims.

In the case of endlessly welded bands, it is particularly useful, according to claim 2, the Welding seam connecting strips as an excellent area on the rolling stock for detection by means of the Detector to use. If no such weld is available, a predetermined number of revolutions of the unwinding coil as a measure of a certain strip length are used, so that the excellent area of the rolling stock according to claim 3 by a predetermined tape length is defined. Optionally, according to claim 4 for the definition of the excellent Area on the rolling stock also has a perforation, a notch, an optical, a magnetic or a radioactive marking may be provided, the corresponding by a photoelectric detector, a Bandwidth detector, magnetic detector, or radiation detector is detected. To the Improving the reliability of the detection can have two or more different detector systems Design can be combined with each other.

In the figure of the drawing, one is preferred

Ausfühningsfcrm the invention schematically on a five-stand rolling mill is illustrated and described below.

A detector 1 which detects a marked area on the rolling stock delivers a pulse to a preset counter 14 when the marked area passes the detector I. Pulse generator 9,10, U, 12 and 13 are mounted on a scanning roller 2 at the inlet of the first roll stand or on the drive shafts of the work rolls of all roll stands 3, 4, 5 and 6 with the exception of the last roll stand 7 and lisfem each of the number of Revolutions of the scanning roller 2 of the work rolls of the roll stands 3, 4, 5 and 6 corresponding pulses to preset counters 14, 15, 16, 17 and 18. In the preset counter 14 is a computer 19 that corrects is calculated by the equation k = I, Ν \ / π Rd is preset, where A is the distance between the detector 1 and the first roll stand 3, Nt is the number of pulses per revolution of the follower roller 2 and Ra is the diameter of the follower roller 2.

In addition, a value expressed by the equation k = I _n N _n Zn R _n {1 + f ") is stored by the computer 19 in each of the preset counters 15 to 18, where /" is the distance between adjacent roll stands, N _{n is} the number of impulses per revolution of the work roll, R _n the diameter of the work ** ^: 'roll and f "means the slip in the forward direction.

After receiving a control pulse to initiate counting, each preset counter 14 to 18 begins counting pulses generated by the assigned pulse generator 9 to 13, and if the preset counter has a predetermined preset value preset by the computer 19 corresponding to a certain number of Has counted or reached pulses, a pulse is delivered while the preset counter 14 is its Initiates the counting process depending on the pulse emitted by detector 1, the preset counters 15 to 18 in operation by the pulses emitted by the previous preset counters set, which are generated when the respective preset value in the preceding preset counter is reached is.

Furthermore, a program memory 20 is provided in which the rolling plans of the respective roll stands for the next thickness are stored by an independent computer or by hand. These Stored rolling plans are dependent on the output signals of the respective preset counters transferred to the setting device for the respective roll stands.

After the end of a rolling process, the setting counters of the relevant preset counters 14 to 18 are set and the program memory 20 modified for the next rolling run

1 sheet of drawings

Claims (4)

Patent claims: 1. Control device on a rolling mill for influencing the thickness of the rolling stock with at least one rolling stand having working rolls, * with a detector for determining a marked area on the rolling stock being arranged at the rolling mill inlet and with a device consisting of a scanning roller, pulse generator and preset counter for determining the running time of the> ° ^{Rolling stock is provided between the detector and the downstream roll stand, characterized in that pulse generators IS} (10 to 13) are drive-connected to all existing roll stands (3 to 6) with the exception of the last roll stand (7) with one of the work rolls, to which preselection counters (15 to 18) are assigned, which evaluate the impulses in accordance with the respective upstream preset counters (14 to 17) including the preset counter (14) acted upon by the detector (I), since a computer (19) is provided which stores the preset values for the individual preset counters (14 to 18) according to the distance between between adjacent roll stands or between the detector (1) and the downstream roll stand (3), the diameter of the work rolls or the scanning roller, the number of pulses per revolution of the work rolls or the scanning roller and the slip are calculated, and that a program memory (20) is provided which, depending on the *> output signals in the individual preselection counter (14 to 18), enables the preset values for the assigned roll stands 2. Apparatus according to claim 'characterized in that the detector (1) detects as excellent & rolling area at a weld of two interconnected strip portions. 3. Device according to claim I, characterized in that that the detector (1) as an excellent area on the rolling stock a predetermined by a The length of the rolling stock to be rolled is defined by the number of revolutions of a discharge coil for the rolling stock detected area. 4. Apparatus according to claim 1, characterized in that the detector (1) as excellent Area on the rolling stock! a perforation, a lateral notch, an optical, a magnetic or detects a radioactive label