SU682299A1 - Digital apparatus for measuring thickness of material during continuous rolling - Google Patents

Description

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The digital measurement channels are AO, s and LO, LI, LZ, LS (Lo-f-Lg), a clock pulse generator (GTI) with a pulse following period equal to a specified time interval for which, 8 mm and a pulse generator (HI) a frequency proportional to the rate of movement of the material at the mill inlet, mechanically associated with the input measuring roller.

The digital measurement channels Lo and h: i have a thickness gauge and an analog-to-digital converter (ADC), and the measuring channel hi), in addition, the AND circuit and the shift register, respectively, are connected to the output of the specified GTI.

Each of the digital measurement channels (/ IO-T-LS) is decided on a pulse generator with a frequency proportional to the speed of the corresponding material movement, mechanically connected with the corresponding measuring roller, and with a binary counter of pulses.

GTI is made on the counter intervals, connected to the output of the GI frequency proportional to the speed Vo.

The clock pulses from the output of the GTI with the interval ti set the discreteness of the digital measurements ho and (), input them into the calculators and output the results (hi and hz). They are also used in the shift register for sequentially, with the clock ti, shifting the ho code to the right in order to synchronize the writing of the ho code in the output memory cell of the register with the approach of the beginning of the dimensional segment LO to the roll stand 1st stand. For this, the strip distance from the input thickness gauge to the specified roll solution is taken equal to n ОО, where DO is the diameter of the input measuring roller, n is the number of memory cells in the shift register.

However, the accuracy of approximation of the calculated thickness to the actual is relatively low.

This is due to the fact that digital measurements of the ratios are -, - (corresponding to LIZ, 2

Specifically, Vslvz) are carried out at predetermined magnitudes of displacements (velocities), which introduces a total error in one-time thickness calculations. In addition, the measurements are carried out with a discreteness ti, given by a linear displacement Lo 304.8 mm. If there are disturbances in the cells of the mill, this worsens the degree of approximation of the calculated thickness to the actual, especially in the tail cells of the mill, since. At the same time, the discrete resolution ti is taken along the linear displacement, 8 mm causes reverse errors that are introduced into the measurement channels () and / Zo

The purpose of the invention is to improve the accuracy of measuring the thickness of the material in the process.

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continuous rolling by increasing the accuracy of the digital measurement of the ratios of the material speeds before and after the deformation, increasing the measurement discreteness and decreasing the circulating errors.

In the proposed technical solution, the material thickness in the continuous rolling process is calculated by solving an equation of the form (1), specifically the equations:

Lu ..--: / g, and, (4)

/ 2, and „-, (5)

Y.Ov h (Vi, (6)

where ho, Vo is thickness and speed

material transfer at the mill inlet, respectively;

hi, Vi, hz, vz, hi, Vi - TO same, at the output of 1, 2 and i-th stands

mill, respectively.

The drawing is a block diagram of the device. The device contains calculators 1 of output thickness, solving equations (4) and (6) respectively, connected to them channel 2 of digital measurement and input into calculators ho and measuring circuits for digital measurement of the ratio of speeds VQ / VI, vofvz ... Vofvi, and (GTI) 3 with a pulse following period equal to the time of one revolution of the input measuring roller 4 and GI 5 with a frequency proportional to Vo.

The ho 2 digital measurement channel includes a thickness gauge 6, an AND 7 circuit, an ADC 8 and a shift register 9.

The GTI 3 is made on a 10-turn pulse sensor and GI 5, which is mechanically connected to the measuring roller 4.

Each of the measurement circuits for a digital velocity ratio contains a binary counter for AND pulses and a GTI 12 with a pulse repetition period equal to the time of one revolution of the measuring roller 13; The GTI 12 is made in the form of a pulse sensor 14 turns and connected to it HI 15 by a frequency proportional to Vi, which is mechanically connected with the measuring roller 13.

The output of the GTI 3 is connected to the AND 7 circuit and the shift register registers 9. With the inputs of binary counters 11 pulses, the outputs GI 5 and GTI 12 are connected. The outputs of the calculators 1 are connected to the correctors (not shown in the diagram).

The principle of operation of the device is as follows.

In the process of continuous rolling, measuring channel 2 together with GTI 3 periodically, with an interval to nDo / vo, where DO is the diameter of the input measuring roller 4, inserts numbers into the output cell of the shift register memory 9 and holds them for a time o.

During this interval about (parts of it) measuring schemes of relations (uo / fi) form numbers () with tact

to nDi / Vi,

where Di is the diameter of the measuring roller behind the i-th mill stand.

The inputs into the calculators 1 of the output thickness of the numbers ho and (vo / Vi) and the reset to binary zero counters 11 pulses are clocked by the generators 12 clock pulses with following periods in conjunction with the circuit 16.

Numbers (vo / Vi) are formed by counting in binary counters 11 pulses of the number of pulses coming from GI 5 during the interval to, i.e. during the time of one revolution of the measuring rollers 13, since at the frequency GI 5

f

 -Lo

where FI is the number of pulses per one rotation of the roller 4, the specified number of pulses will be

P, - f .f -P t

UO GU-o

 - / 1 0 - D) 0

Vi vi

Where

known constant number.

iJr,

The results of calculating the thickness of the material behind each stand are fed at a rate to at the output of the offsets by the actual thickness above each stand.

The presence of such measuring circuits in the device, which form numbers (uo / U;) without prior independent determination of Uo and Vi, with the implementation of GTI 12 on pulse sensors 14 turns and the GTI 3 performance similar to this, favorably distinguishes the proposed device from the known The digital measurement error (voJUi) and the revolution errors introduced by the measuring rollers also reduce the intervals between the thickness calculators to f (, nDi / Vi (one-time measurements are made via nDf / Vi).

As a result, the accuracy of calculations of the material thickness during the rolling process or the degree of approximation of the calculated thickness to the actual one will be improved. The proposed solution also reduces the duration of a single thickness calculation.

These benefits provide a significant total national economic effect (for producers and consumers

rolled).

Claims (2)

1. US Patent No. 3394567, cl. 72-9, 1972. 2. US patent N ° 3564882, cl. 72-8, 1974.