DE1198773B - Device for controlling the roll speed of two or more continuously operating roll stands - Google Patents

Description

Control device of the roller speed of two or more continuously working roll stands The invention relates to the control of the roll speed of two or more continuously working roll stands to achieve pressure and tension-free rolling of medium and heavy rolling stock, e.g. B. slabs, billets, Carrier and the like

In known continuous rolling mills there are loop guides arranged between the stands to enable tension-free rolling. So is it is known, between two stands of a continuous roller train, looper, that allow looping upwards, or loop tables that allow a allow side looping to use. Here, the rolling stock is turned off the rolling line deflected more or less strongly. By influencing the roller speed the size and position of the loop is always kept constant. Monitoring the Loop can be created by mechanical scanning or by contactless detection of Deviations are made by means of photo cells or capacitor plates.

However, this deflection of the rolled strand to form a loop is only possible with relatively thin rolled material. If the rolled material is thicker, one tries therefore to measure any tension or pressure occurring in the rolling stock and as a function of which to regulate the speed of the rollers.

For speed control in continuous rolling mills for stronger Rolling stock has been proposed, for example, the rolling stands around horizontal, axes located transversely to the rolling direction to be arranged pivotable and against the pressure or train of the rolling stock to be supported by pressure cells, the measured values of the pressure cells serve to regulate the roller speed. It has been shown that the the required clearance between the chock and the upright in the stud window off-center and thus forces already occur which act on the pressure cells act without tension or pressure in the rolling stock.

In another known device, the tensile stress in the rolling stock is measured between two roller pairs by means of a feeler roller pressed against the rolling stock, which experiences a deflection when the tensile force changes. The amount of deflection gives the size of the control pulse for influencing the speed of the rollers.

It was also suggested that the chocks against the stand on pressure cells to support the tensile or compressive forces occurring in the rolling stock capture.

Since pressure cells measure travel-dependently, those occurring in the rolling stock must Tensile or compressive forces only reduce the friction between the chock and the adjustment spindle overcome in order to get a sufficient path on the chock. The one occurring here Friction is very large with thicker roll cross-sections, so that it has to be overcome considerable tensile or compressive forces are necessary in the rolling stock. Before one the pressure cells influencing effect on the chocks occurs, the rolling cross-section can already be deformed and the surface of the rolling stock damaged.

The object of the invention is to create a control device about the roller speed when continuously rolling medium and heavy loads To regulate rolling stock between two successive stands so that there is no tension or pressure can be rolled.

The solution to this problem is based on the arrangement of sensors in the Area of the rolling stock which is freely sagging between two stands and which is exceeded determine the permitted sag values and as a control pulse for feedback utilize the sag between the limit values by influencing the roller speed, and according to the invention it consists in the fact that the sensor is one above and one below the rolling stock is arranged and supported on a pressure measuring device each role, and the control impulses from the one that takes effect when the rolls come into contact with the rolling stock Compressive forces are derived.

When piercing it is necessary to first create the intended sag of the rolled stock between two stands. For introducing the rolling stock into the roller gap of the following scaffolding are guide troughs that can be folded away downwards known. Such guide troughs are particularly advantageous in which one part in the area of one and the other part in the area of the other roll stand is mounted pivotable. According to the further invention, the foldable down Guide trough for introducing the rolling stock into the roller gap and for setting of the intended sag when piercing in the second framework bulges slightly downwards.

In the drawing, a device according to the invention is shown as an exemplary embodiment. A two-part guide trough 3 a, 3 b is arranged between two roll stands 1 and 2. In the position shown in dashed lines, the channel is when the rolling stock 5 runs out of the roll stand 1. When the rolling stock in the roll stand 2 has been pierced, the guide channel is folded away. It is slightly bulged towards the bottom and is used to set the intended sag of the rolling stock.

The tensile or compressive forces occurring in the rolling stock have the effect of reducing or increasing the sagging of the rolling stock between the two roll stands. When tension occurs in the rolling stock, the sag is shortened and the rolling stock runs against the roller 6, exerting an upward pressure on this. If the tension in the rolling stock increases, which is noticeable in a shortening of the sag, this simultaneously causes an increase in the rolling stock pressure on said roller. When there is pressure in the rolling stock, the sag will increase, with the rolling stock exerting a pressure on the roller 7 arranged below the rolling stock, which pressure increases further as the pressure in the rolling stock increases due to greater sag.

The rollers 6 and 7 are mounted in chocks 8 and 9. These chocks are supported against spindles 11 via pressure cells 10 . These spindles can be adjusted electrically or by hand so that the height of the rollers can be changed in order to adapt their position to the different thicknesses of the rolling stock. The spindles 11 are mounted in a stand 12.

Record the pressure cells between the chocks and the spindles the compressive forces that occur when the rolling stock changes in length and as a control variable can be used to influence the rolling speed.

For example, it would also be easily possible to follow the channel bulge at the top so as to give the rolling stock an upward deflection and the tensile forces in the rolling stock via the lower roller and the compressive forces via the upper one Roll the load cells to record.

Claims (2)

Claims: 1. Control device for the roll speed of two or more continuously operating roll stands to achieve tension-free and pressure-free rolling of medium-weight and heavy rolling stock, e.g. B. slabs, billets, girders and the like, with sensors arranged in the area of the freely sagging rolling stock, which detect if the permitted sag limit values have been exceeded and use them as a control pulse to return the sag between the limit values by influencing the roll speeds. Ind eichnet that arranged as a sensor depending on a above and below the rolling stock (5) is used on a respective pressure gauge (10) supported roller (6.7), and the control pulses from the on contact of the rollers (6, 7) by the rolling stock (5) effective compressive forces are derived. 2. Control device according to claim 1 with a two-part, downwardly foldable guide trough between two roll stands, characterized in that the guide trough (3 a, 3 b) for introducing the rolling stock (5) into the roller gap and for setting the intended slack when tapping is slightly bulged down in the second frame (2). Documents considered: German Patent No. 1 004 711; German Auslegeschrift No. 1 054 407; Belgian Patent No. 521793; French Patent No. 1111036; USA. Patent Nos. 2,221,592, 2,193,189, 1,072,676th