SU1312375A1 - Device for measuring length of rolled material in rolling installation - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention is to improve the accuracy and enhance the functionality due to the expansion of the resolution of the drive shaft revolution sensor when counting revolutions in the measurement cycle and by measuring and indicating the length of the removed material. The pulses from the drive shaft rotation sensor 1 are received by the B block 2 coincidence, passed to the counting block 3, where the counting is provided. An indication of the length of the wound material is provided. At the same time, the pulses from the sensor 7 turns of the coiled winding come through the block 8 of coincidence to the counter-register 9. If the material breaks, the sensor 5 breaks the ma-. The unit, through blocks 2 and 8, blocks the arrival of pulses from sensors 1 and 7 and starts microprocessor Q block 10, under the control of which you & the current information of the counter-register 9 and block 3 is rewritten into memory (L 00 H O CO SP

Description

131

block 10, the counter-register 9 is reset, and the set value of the roll rotation number in the measurement cycle from the setpoint 11 is written to it. Block 10 calculates the average material thickness in the roll t and the diameter of the roll at the moment of cut D. After removing part layers of material and the elimination of the breakage is further winding of the roll, while the sensor 5 permits the passage of pulses from sensors 1 and 7 to block 3 and the counter-register 9. After reaching

t

The invention relates to a measurement technique and can be used in various areas of the national economy in the production and processing of rolled materials.

The purpose of the invention is to improve the accuracy and enhance the functional capabilities by expanding the resolution of the drive shaft rpm sensor when counting revolutions in a measurement cycle and by measuring and indicating the length of the material removed.

The drawing shows the block diagram of the device.

The device comprises a drive shaft rotation sensor 1, a coincidence unit 2, a recalculation unit 3 with a length indicator, an indication unit 4 of material removed from a roll, a material breakage sensor 5 and a cut-off material re-metering elimination unit 6. At the same time, the inputs of the 2-matching unit are connected to the outputs of the sensor 1 of the drive shaft speed and the sensor 5 of the material break, the output of the matching unit 2 is connected to the input of the conversion unit 3 with a length indicator, the second input is connected to the output of the node 6, the first input of which is connected to the output sensor 5 material breakage. The output of the counting unit 3 with the length indicator is connected to the second input of the node 6.

Node 6 for eliminating re-registration of the cut-off material is made in the form of a winding-up sensor 7 turns75

The counter-register 9 of a given value of the number of revolutions of the roll in the measurement cycle unit 10 determines the diameter of the roll D, which became after cutting and removing the material. Next, block 10 compares BE with the numerous diameters Dp and Dj-p. If DQ D (.p, then the device switches to the mode that was before the material was broken. If DO Dj-p, then block 10 calculates the length of the a. L removed from the roll and determines the length of the material in the roll by the difference of the current length and L-. 1 ill.

roll, block 8 of the match, the counter-register 9, the microprocessor unit 10, the knob 11 the number of revolutions of the roll in the measurement cycle and the block 4 of the indication of the material removed from the roll. Moreover, the inputs of the coincidence unit 8 are connected to the outputs of the sensor 7 for the turns of the reel to be wound, and the sensor 5 for the material breakage,

counter-register 9 - to the outputs of the coincidence unit 8, the knob of the roll rotational speed in the measurement cycle and the first output of the microprocessor unit 10, whose inputs are connected to the outputs of the material break sensor 5, the counter-register 9 and the scaling unit 3 with a length indicator, whose input connected to the second output of the microprocessor unit 10, the third output of which is connected to the input of the display unit 4 of the material removed from the roll.

The device works as follows.

The sensors 1 and 7 turns form pulses, the number of which is proportional to the number of turns of the drive shaft and the winding roll. Impulses from sensor 1 come in

block 2 matches. In the normal mode, these pulses pass through block 2 to counting unit 3, where the counting and indication of the length of the wound material is provided. At the same time, the pulses from DS1 of the sensor 7 are fed through the combination unit 8 to the counter-register 9, which performs the counting of pulses.

313

coming from the sensor 7 turns wound roll.

When a material breaks, the sensor 5 through blocks 2 and 8 coincides blocking the arrival of pulses from sensors 1 and 7 and starts the microprocessor unit 10, under which the output information of the counter-register 9 and the counting unit 3 is copied to the memory of the microprocessor unit 10, The register 9 is reset and the set value of the roll speed in the measurement cycle, coming from the sensor 11, is written to it.

After the issuance of the control signals is completed, the microprocessor unit 10 performs the calculation of the average material thickness in the roll t and the roll diameter at the time of the break D using the formulas

one

(

Tn,

- dr).

where Pr the number of revolutions of the roll at the time of the break; LO - length of material in roll in

break moment; dp - diameter of the sleeve (shaft), on

which is wound material 7G 3.14159,

, + () t.

After the removal of a part of the material layers and the elimination of the break, the coil is further wound, and the sensor 5 allows the passage of pulses from sensors 1 and 7 through blocks 2 and 8 of coincidence to counting unit 3 and counter-register 9.

After the counter-register 9 reaches the set value of the roll speed in the measurement cycle, the microprocessor unit calculates the diameter of the roll Dpp, which became, after cutting and removing the material, using the formula

where 4L is the increment of the roll length per

lp roll speed; ip is the number of revolutions of the roll in the measurement cycle.

Next, the microprocessor unit 10 compares the diameters Dp and

54

Dj-p, the equality of which indicates that no cut and removal of the wound material was made during the break. In this case, the device switches to the mode that was before the breakage of the material. If Dp is greater than DJ, then microprocessor unit 10 calculates the length of material removed from the roll Ly by the formula

. M (Di - Dip)

VA

4-t

After completing the calculation, microprocessor unit 10 rewrites the current value of length L, fixed in conversion unit 3, and performs a subtraction operation to determine the length of material in roll L by the formula

LI i- (Y l

The result obtained by the microprocessor unit 10 outputs to the conversion unit 3 for indicating the length, simultaneously in display unit 4 the length of the material removed from the roll of material appears and the device switches to normal operation.

Increase measurement accuracy by

Compared with limestone devices, this is achieved by increasing the number of roll turns in the measurement cycle.

The relative measurement error in known devices is determined by the resolution of the drive shaft speed sensor and depends on the measurement error of the number of sensor pulses with / N over the measurement cycle (equal to one revolution of the coil being wound), which is

t1 pulse

N

where N is the number of pulses received from the drive shaft speed sensor.

As the number of roll turns in the measurement cycle increases, the error is determined by the formula

± 1 pulse

NK

where K is the number of revolutions of the roll in the measurement cycle, when measuring the diameter of the roll at the moment of breakage, when measuring the diameter of the roll after cutting and removing the DCP material.

Thus, the relative value of the measurement error depends on the measured value and the smaller, the greater the number of revolutions of the roll in the measurement cycle, i.e. is additive, the gain in accuracy is the greater, the greater the value of K.

Claims (1)

Invention Formula A device for measuring the length of the coiled material in the winding installation, comprising a serially connected sensor of the drive shaft rotation of the winding installation, a coincidence unit and a recalculated unit with a length indicator, a material breakage sensor and a section for the elimination of re-counting of the cut material with the coil rotation sensor, characterized in that, in order to increase accuracy and expanding the functionality, the re-counting elimination unit is made in the form of a series-connected additional coincidence unit, a counter-register, a microprocessor unit and a display unit of the material removed from the roll, and a rotational speed adjuster in a measurement cycle, output connected to the second input of the counter- register, the output of the winding roll speed sensor is connected to the first input of an additional block of coincidence, the break sensor output is connected with the second inputs of the coincidence units and the microprocessor unit, the second and the third, the outputs of which are connected respectively to the third input of the counter-register and the input of the counting block, the third entrance - with the output of the counting unit.