RU1778509C - Method for measuring length of front end of rolled stock protruding beyond line of cut of shears - Google Patents

Description

from each other, according to the signals of these sensors take into account the sum of the base distances covered by the product, and the time intervals of the front end of the product passing the base distances, sections of the base distances adjacent to the completely covered base distances and the remnants of the base distances, determine the length of the residuals of the base distances, the lengths of the residuals of the base distances are compared, and for the final calculation of the length of the article, the smaller of the values of the residues of the base distances is taken.

The known method can be applied only for small changes in the rolling speed of the rolled product, and cannot provide sufficient measurement accuracy in the presence of large accelerations (positive or negative), in which rolling is observed on the rollers of the roller table.

The purpose of the invention is to increase the measurement accuracy by reducing the error from slipping of the rolling stock on the rollers of the roller table.

This is achieved by the fact that in the method for measuring the length of the end of a rolled product that extends beyond the cutting line of the scissors, which consists in placing the rolled stock sensors at a base distance, the sum of the base distances covered by the product and the super-base length at the moment are calculated rolling stops, sensors for the availability of rolled products are located at a distance shorter than the stopping distance of the roller table, when the rolling end passes each base distance, the rotation speed of the roller tables is measured and if slippage occurs correct the measured length by a value proportional to the ratio of the change in speed at the last base distance and on the section overlapped by the front end of the rental at the time of stopping.

The drawing is a diagram illustrating the proposed method for measuring length.

Here, a number of sensors DrDn are indicated for the presence of rolled products located along the direction of rolling 1 behind the hot cutting shears 2. The base distances between the sensors b are chosen equal to each other and should be less than the braking distance of the roller table. A converter 4 of the angle of rotation of the roller into the number of pulses is kinematically coupled to the axis of the roller 3 of the roller table. The outputs of the sensors Di-Dn of the rental and the converter 4 are connected to the calculation unit 5. The output of the calculation unit is connected to a digital display 6.

The essence of the method is as follows.

When the rolled metal is moved using the transducer 4, the lengths br at the base distances x 1 bp are successively counted. limited by the availability of rental sensors, and superbase length of the end of the rental, past the last basic sensor of the availability of rental. After passing the rental of each base distance, the calculated br and actual bf length values are compared

fifteen

1b br - 1bf1.

Upon receipt of the next difference value D h + i, the previous value Ah is emulated.

In addition, the rotation speed Vei of the roller table rollers is measured at each base distance. If the rolling movement occurs without slipping on the rollers of the roller table, then the difference D1 | between calculated br and actual 1bf values

the base distance should be close to zero. When braking the roller table, the speed of rotation of the rollers changes, and as a result of rolling slippage on the rollers of the roller table, a difference between

calculated lepi and actual 1bf values of the length of the rental at the base distance of the research institute.

The deviation of the calculated value of the length of 1br from the actual 1bf will depend

on the magnitude of the change in velocity D Ve.

If, when calculating the superbase length 1X, a change in the speed of rotation of the roller table rollers D Vx is also observed, then a correction is introduced into the measured length value proportionally to the ratio of the change in speed at the last base distance and in the section covered by the front end of the rental at the time of stop

D1coRR. - $: - D1v,

where D Vx is the change in the rotation speed of the roller table rollers in the superbase length calculation section;

D Ve is the change in the rotation speed of the rollers of the roller table at the last base distance;

D 1b - the difference between the calculated and

actual rolling lengths at the last base distance.

The adjusted superbase length will have the form

1xcorr - Ix ± A Ixopp.

Then the measured length of the rolled, extending beyond the cut line of the scissors, is determined from the expression

L + Ix + Arr - bf),

where n is the number of base distances covered by the product.

Using the angle of rotation transducer 4 to the number of pulses, the process of measuring the length of the end of the rolled out of the cut line of the scissors is as follows.

When rolled 1 is moving, the front end sequentially illuminates the sensors Di, D2, etc. According to the signals of the illuminated sensors, Nei pulses are counted from the transducer 4 at each base distance b. At the same time, pulses L NI are counted for calibrated time intervals Ati and the magnitude of the change in the number of pulses for each time interval D t is determined

5Ni A Ni- DM (m)

The number of pulses N6c {fixed at a base distance 1b is compared with the calculated value Mbrasch.

The calculated value of the number of pulses Mb. determined from the expression

Mb. t-1b.

where t is the pulse scale of the transducer, imp / mm.

The pulse scale depends on the circumference of the roller table rollers Lp and is calculated by the formula

Masm -)

Ln

where Mob is the number of transducer pulses per revolution.

The difference in the number of pulses ANei between the calculated value Ne calc and the fixed value N (6.j.) i on the base length 1b, i.e. A Nei Mb. - 1M (bf) | shows the magnitude of the error due to slippage of the roll on the rollers of the roller table with a change in the rotation speed of the rollers.

The value of the difference in the number of pulses D Mb and the corresponding change in the pulse arrival rate d Ni from the converter 4 are calculated on each

the base length in the calculation unit 5 and is stored in the memory.

After receiving the number of pulses at the next base distance, the previous value from the memory is deleted.

After a signal is issued to stop the rolling table, a certain inertia distance passes. Since the Di-Dn sensors are located at distances shorter than the stopping distance of the roller table, the front end of the roll will pass after turning off the roller table a section whose length is not less than the base distance.

When the rental stops completely at the section blocked by the front end of the rental x, which has exceeded the last blocked sensor, the number of pulses NX will be recorded.

If this area will be observed

the change in the pulse arrival rate for the calibrated time intervals of such a value that, during the movement of the roll, slippage was observed at the last base distance

and the difference between the calculated and fixed value of the number of pulses was determined, then the correction DMcor is introduced into the number of pulses NX. obtained at the last base distance.

The value of the corrective action is introduced in proportion to the change in the pulse arrival rates in the section overlapped by the front end of the rental and at the last base distance.

A NKopP - DMB (s).

where d Nn is the change in the pulse arrival rate in the section overlapped by the front end of the rental;

5 N (n-i) is the change in the pulse arrival rate at the last base distance;

ANe (n} is the difference between the calculated

value of the number of pulses and a fixed value at the last base length.

The length of the end of the roll, past the last blocked sensor, will be

(NX ± A NKOPP

m

The total length of the rolled beyond the cut line of the scissors is determined from the expression

- (p-1) 1bl - ± 7g) c

where n is the number of illuminated sensors for the presence of metal.

The value of the length L is displayed on the digital display 6.

Example. The basic distances between the sensors for the presence of metal are equal to each other and amount to 200 mm.

The circumference of the roller table roller at d 400 mm is

LP 3.14x400 1256mm

The number of pulses of the converter per revolution N06 1200.

Impulse scale

LP

1200 1256

1 imp / mm.

d N4 - A N5 - A N4 b N5 d Mb - b Ns

 68 - 68 O 67-68 -1

Consequently, at the second base distance, the roll also moved with a uniform slippage speed.

At the third base site, a Meph. of 177 pulses was received, while for each calibrated time interval, pulses A N7-68 were received. A Ne-69, A N9 40 It is seen that during the movement of the front end of the roll in the third base section, braking was performed and the rotation speed of the roller table roller sharply decreased. The difference between the calculated and fixed values of the number of pulses is

Estimated number of pulses at a base distance of 20

N6.

calc.

t 1b 1,0-200 200 imp.

At the first base distance, Mb.f. 202 pulses, and for each calibrated time interval the following values of the number of pulses were obtained: A Ni 67. A N2 58. A N3 67.

The difference between the calculated and fixed values of the number of pulses is

A Nei Mb. - Mb.f. 1 200-202 -2imp.

Change in the number of pulses for each calibrated time interval

d N1 D N2- A N1 68-67 1 d N2 A Ms - A N2 67 - 68 -1

Consequently, at the first base distance, the rumble moved with almost the same speed, therefore

No slippage was observed.

At the second base distance, Mb.f2 203 pulses were obtained, and AN4 68, A NS 68, and A Ne 67 pulses were obtained for calibrated time intervals.

The difference between the calculated and fixed values of the number of pulses at the second base distance is

A Mb. 2 Mb. - N6 f. 2 200 - 203 -3

Over calibrated time intervals, the number of pulses changed as follows.

b Mz - A N4 - A N3 68 - 67 - 1

D MbZ - Mb.calc. - Mb.s. 200 - 177 23

The change in the number of pulses for each calibrated time interval is

d Mb A Ne 68 - 67 1 5N7 AN8- AN 69-68 1 d Ne - A N9 - A Ns 40 - 69 -29

Thus, at the third basic distance during braking, there was a sharp change in the arrival of pulses (by 29 pulses per calibrated period of time) and, as a result of the slip, the difference D Mez between the calculated and Mb calculation. and the fixed Mb.s of pulses reached 23 pulses.

When moving the front end of the roll at the fourth base distance, the following values of the number of pulses for the calibrated time intervals were obtained:

i 4 Nio-9, Atati47,4N12 5, ANi3 3,: A N14 2.A Ni5 1.ANi6 0.i

The peal has stopped in such a position that its front end is in the fourth base distance.

The total number of pulses along the length of the front end of the roll, past the last illuminated sensor, Nx - 28.

The number of pulses per calibrated time intervals changed as follows:

b9- A Nio- A Me-E-40 ° -31 d Mu - A NII - A Mu - 7 -10 -3 d Nil A Ni2 - A Nn - 5 - 7 -2 d Ni2 D Ni3- D N12-3 -5--2

(3Ni3 A N14- D Ni3 2-3 -1 dNu ANis- ANu 1 -2--1 d N15 ANie- ANis 0-1 -1 5Nie ANi7- ANie 0-0 0

According to the number of pulses per calibrated time intervals, it is evident that over the first time interval, the number of pulses changed by a large amount (31 pulses), and then the change in the number of pulses in time occurred insignificantly until the rumble stopped. Consequently, during the movement of the roll in the first period of time, slippage still occurred.

The length of the front end of the roll, past the last illuminated sensor, without slipping will be

lx m Nx 1,0 x 28 28 mm

To account for slippage, the number of pulses for correction is determined.

7th

A NXKOPP -

-31 x.23 24

-29

Then, taking into account the correction, the length of the front end, beyond the last illuminated sensor, will be

52 mm

IxKOpp-

 NX ± A NXKQPP 28 + 24 52, m 1.01.0

The total length of the rolled out of line cut

0 5

0

5

0

L - (p-1) b + IXKOPP (4-1) x 200 + 52 - 600 + +52 652 mm

Claims (1)

The claims A method for measuring the length of the front end of a rolled product that extends beyond the cutting line of the scissors, which consists in placing the rolled stock sensors at the base distance, calculating the sum of the base distances of the overcoated product and the superbase length at the time the rolled stop, distinguishing - so that, in order to improve accuracy by reducing errors from slippage of the rental along the rollers of the roller table, the sensors for the availability of rental are placed at a distance shorter than the stopping distance of the rolling table, when passing through the end At each base distance, the frequency of rotation of the rollers of the roller table is measured, and when slippage occurs, the measured length is corrected by a value proportional to the ratio of the change in frequency at the last base distance and on the section overlapped by the front end of the rental at the time of stop. t & x # {/ tЈ6Ј i ffjp0 a n Jv th & gi -II ur utu 2ff AT . fa & ffa / P4L6 Lg l fo r tys u / nqp , / Nal / U