SU1597520A1 - Device for measuring length of material being rewound - Google Patents

Abstract

The invention relates to a measuring technique and can be used in the processing of rolled materials, for example in the manufacture of corrugated cardboard. The goal is to increase reliability and informativeness by measuring also the length of the remainder of the material in the unwinding roll. The pulses from the length sensor 1 are fed through a coincidence unit 2 to the counting unit 3 with a length indicator. At the same time, the pulses from the sensor 6 are fed through block 2 to the counter-register 8, which counts the pulses from the sensor 6 turns of the unwinding roll. At the beginning of the winding or after the break, the counter-register 8 is zeroed out and the length-wound length rewound in the microprocessor unit 4 is rewound during the delay time. Block 4 calculates the average thickness of the material. At the end of the unwinding of the roll, according to a signal from the sensor 13 of the end of the unwind, unit 4 calculates the diameter of the remainder of the material in the roll and the length of the remainder of the material in the roll. 1 il.

Description

The invention relates to measuring equipment and can be used in the processing of roll materials, for example in the manufacture of corrugated cardboard on corrugated machines in the pulp and paper industry.

The purpose of the invention is to increase the reliability and information content by measuring also the length of the remainder of the material in the unwinding roll.

The drawing shows a block diagram of a device.

The device comprises a length sensor 1 connected in series, a coincidence unit 2, a conversion unit 3 with a length indicator, and a microprocessor unit 4 connected by its output to the input of the conversion unit 3 with a length indicator 20, and a second output with a length indication unit 5, and connected in series sensor 6 turns of the roll, the second block 7 matches, counter-register 8 ,. second input 25 • of which is connected to the output of the setpoint 9 of the number of revolutions in the cycle, and the third input and the output of the counter-register are connected respectively to the third OUTPUT AND the second INPUT of the microprocessor of the weed unit 4, the open circuit sensor 10 connected to the output with the second inputs of the first 2 and the second 7 coincidence blocks with the inputs — a time delay unit 11 and a delay unit 12 along the rewound length, the outputs of which are respectively connected to the third and fourth inputs of the microprocessor unit 4 connected by the fifth input to the output of the sensor 13 of the end p winding roll.

The device operates as follows.

Length sensor 1 and speed sensor 6 generate pulses, the number of which is proportional to the length and number of revolutions of the unwinding roll.

The pulses from the sensor 1 of the length are fed through the block 2 matches on the recounting block 3 with a length indicator, which provides a count and indication of the length of the rewound material. At the same time, the pulses from the sensor 6 are received through the coincidence unit 7 to the counter-register 8, which produces a pulse count from the sensor 6 obV at the beginning of winding or after restoration of the break with a delay along the length of the unwound material (or by the quality of the revolutions of the unwound roll) provided by the delay unit 12 by length, the microprocessor unit 4 is triggered, which zeroes the counter-register 8 and records the length of the microprocessor unit 4, rewound during the delay operation.

Then, after 2 · 4η revolutions, and then every zln revolutions, the thicknesses t are calculated. and material:

Σ L _K -cK-5L k - (K - 1)

7Ϊ .lp’-K-T) ’(1) where J η is the number of revolutions (turns) of the rewind roll specified by block 11; K is the number of Ζη revolutions;

- the total length wound over the last K ^ jn revolutions;

2L _Ki ~ total length, rewound for the previous (K - 1) jn revolutions;

where is the average thickness of the material calculated over the entire • rewind cycle;

t _C p (i-1) is the average thickness of the material calculated for the sum of the previous Zin revolutions;

i is the number corresponding to the number of calculations of average thickness (i = 0,1,2, ..,).

I

At the time of the breakage of the material, the sensor 10 breaks off the material and, with a time delay set by the unit 11, enters the standby mode of restoration of the breakage. After the restoration of the cliff, further winding of the material is carried out and with the delay set by block 12, the microprocessor block 4 is activated, allowing further calculation of t. and t _p _ At the end of the unwinding of the roll according to the signal from the sensor 13 of the unwinding, the diameter of the remaining material in the roll, the diameter of the roll that was before the unwinding, and the companies of the unwound roll are calculated.

the length of the remainder of the material in the roll:

5 i K. η G G (3) TGtZ p- K ^S R ⁹ 1> = 4K _h Tlp-k (4) h = / g (do - dr) K (5)

where is the diameter of the remainder of the material on the sleeve;

d _r is the diameter of the sleeve;

Dp is the outer diameter of the roll before unwinding;

L is the length of the remainder of the material in the roll.

The value of the diameter of the sleeve d _f on which the roll is wound must be measured and entered into the memory of the microprocessor unit 4 before starting to unwind the roll. The calculation results performed by microprocessor unit 4, at the request of the operator, are displayed on the indicators of unit 5.

Thus, the device allows you to additionally indirectly measure the thickness of the rewound material, the diameter of the roll at the end of the unwinding, the diameter of the roll before the start of unwinding, or the current diameter of the roll, if the diameter is calculated by formula (3) in each thickness calculation cycle, and the length of the remainder in the roll.

1597520 6

Claims (1)

SUMMARY OF THE INVENTION A device for measuring the length of a rewound material, comprising a length sensor in series 5, a coincidence unit, a conversion unit with a length indicator and a microprocessor unit, output connected to a second input of the conversion unit, a length indication unit, 10 „input connected to the second output of the microprocessor unit, sequentially connected roll speed sensor, second matching unit and counter-register, output connected 15 * with the second input of the microprocessor unit, the speed controller in the cycle, the output connected to the second input of the counter-register, breakage sensor 20 and inputs connected to its output, a time delay unit and a rewind length delay unit, the outputs of which are respectively connected to the third and fourth inputs of the micro25 processor unit, the third output of which is connected to the third input of the counter-register, the output of the roll break sensor is connected to the second inputs of the coincidence blocks are distinguished by • jQ more that in order to increase the reliability and information content by measuring the length of the remaining material in the unwinding roll, it is equipped with a sensor for the end of the unwinding of the roll, output connected to 35 fifth input microprocessor unit.