SU869890A1 - Apparatus for automatic regulation of strip thickness - Google Patents

Description

The invention does not automate the production of commercial production and can be used in the ferrous and nonferrous metallurgy and in the aviation industry,. The most common method of controlling the thickness of a metal during cold rolling is to change the inter-roll stand solution using a pressure device. In recent years, a new progressive method and equipment has been introduced into rolling production for adjusting the roll gap by stretching the stand bed with the help of hydraulic cylinders embedded between the cushions of the support rolls. This new method can be applied to almost all rolling mills in operation, since it does not require large mechanical alterations, but at the same time, provides an increased speed of operation and reduces wear on the mechanisms of the tl mill. The use of the device for hydraulic stand of the stand as a executing element in the system is automatic. Rolling strip thickness control is provided in the strip thickness control device, in which a micrometer measuring the thickness of the strip at the exit of the rolling mill and the connected discriminator in series with it to isolate the thickness deviation relative to the reference, hydraulic booster and multi pressure puller in hydraulic cylinders. If there is a deviation of the pressure, the pressure in the hydraulic cylinders must vary within the limits necessary to eliminate the error. And this leads to the appearance of thickness variation. Thus, periodic self-oscillations of the control system appear, which are displayed in the output thickness of the rolled polo.

The purpose of the invention is to improve the accuracy of the adjustment.

To achieve this goal, the device additionally contains elements of the dead zone that are connected in series, a multiplier unit and an integrator, the input of the dead zone element is connected via a discriminator to a micrometer, and the integrator output is connected to an adjustable hydraulic drive ..

The drawing shows a block diagram of the proposed device,.

The device contains working hydrogogram 1, located between the cushions of the support rolls, multiplier 2, hydraulic booster 3, micrometer 4, discriminator 5, element 6 of the dead zone, multiplication unit 7, integrator 8.;

The device works as follows.

The discriminator compares signals of a given thickness hj and actual. .If there is a deviation in the thickness of the rolled strip from the reference, a signal arises: (hg-Nf) rolling speed. The output of the multiplier block 7, which is the product of Kah V, jp, is fed to the integrator 8.

Integrator Output Voltage

8 with EVM

one - -. .

u ,,,

where, i.e., integration is carried out along the length of the rolled strip.

If the thickness deviation does not change its sign, the voltage rc rises and the hydraulic booster 3 is converted: to the signal controlling the multiplier 2, as a result of which the pressure in the hydraulic booster system changes until the thickness deviation is eliminated. Thereafter, the signal jsh disappears, a constant voltage is established at the output of the integrator 8, maintaining the established pressure in the hydrospray system, and this will continue until a new deviation occurs, after which the process is repeated.

The economic effect, determined by improving the quality of the metal and rolling with minus tolerances, is about 50 thousand rubles a year.

Claims (2)

1. Bulletin TSNIICHERMET № 23,16969 c, 619. 2. USSR Author's Certificate No. 232909, cl. B 21 B 37/02, 1973.