SU619781A1 - Device for measuring length of material being rolled - Google Patents

Description

The rotates of the coiled roll, the inputs of the memory unit are connected to the output of the control unit and the output of the speed ratio determination unit, the inputs are compared to the outputs of the definition unit and the output of the comparator is connected to the second input of the control unit.

The drawing shows the structures on the scheme of the proposed meter.

The measurer contains a sensor 1 for rotation of the drive shaft, a unit 2 in coincidence, a value, a recirculating unit 3c with a length indicator, a control unit 4, a sensor 5 for material failure, and a section 6 for eliminating the re-registration of the cut material. In this case, the inputs of block 4 are connected to the output of sensor 5 and the output of node 6. To the output of control block 4 is connected one of the inputs of block 2 of coincidence, to the output of which is counted / recalculated block 3 with a length indicator. At the input of the unit 2 is connected to 1 revolutions of the drive shaft.

Node 6 for eliminating metering of cut material is pulverized in the form of a winding roll rotation sensor 7, a rotation ratio determination unit 8, a memory block 9, and a comparator 10, the input of the unit being connected to the drive shaft rotation sensor 1 and the rotation speed sensor 7 respectively memory unit 9 is connected to the output of control unit 4 and the output of speed ratio determination unit 8, inputs of comparator 10 are connected to unit 8 and unit 9, and the output of comparator 10 is connected to the second side of unit 4.

The meter works by following the sample. .

Sensors 1 and 7 revolutions pho1 F1 pulses, the number of which was proportional to the weight of the drive shaft and the winding of the shaft. The pulses from sensor 1 arrive in trees 2 matches. In normal operation, these nanowires pass through block 2 to the first block 3, where counting and the lengths of the wound material are provided. At the same time, the pulses from sensors 1 and 7 are fed to input 8, -b. In this case, a signal is produced, proparcally: the ratio of the revolutions of the driving shaft and the roll. The 1st pulses from Sensor I are transmitted preliminarily, and by measuring the ratio of manufactures by clocks from sensor 7. No. The pulses from the output of block 8 by the signal from the clock pulses are transmitted to block 9 of the memory and to the input of comparator 1p. In the second input, com 10, pulses from the output of block 9 are continuously received, which are the result of the previous tact of measuring the speed / speed ratio in normal operation, i.e.

in the absence of a slice of a layer of material in a roll, the signals arriving at the input of comparator 10 do not affect the connection of the control unit 4, so that the output of the block 4 is supported by a constant signal entering the coincidence unit 2 and ensuring homogeneity through it pulses from the sensor 1 to the scaling unit 3 with the indicator length of 11). Block 4 in the normal mode of operation introduces a signal that permits to overwrite the contents of block 8 in block 9 of memory.

When a material breaks, the signal from the material break sensor 5 is transmitted to the internal block of block 4, under the influence of which the signal is removed, the signal supplied from control block 4 to block 2 is a match, which prohibits length counting, and also signals to overwrite the contents of block 8 to block 9 where the last measurement result remains.

If during the break, it is not made to cut off the layer of the web from the roll, then after the breakage is eliminated, the circuit restores its state and the length count continues.

In the case of a layer of the web immediately after the elimination of a break, the input of the comparator 10 receives mismatched values of the signals of blocks 8 and 9 (current and storage values of the ratio of turns). At the same time, there is no signal at the output of comparator 10, which excludes the appearance of the output signal of the 4th unit:, direction. In this case, the pulses from the speed sensor 1 do not pass to the counting unit 3, thus blocking the measurement of length, and in block 9 the result of the latter is recorded before the cut measurement of the correlation. Upon reaching the current value of the ratio equal to the ratio of turns before cutoff, a signal appears at the output of block 8, which is stored in memory block 9, which ensures that the signal at the output of comparator 10 appears, triggers control unit 4 and unlocks block 2 . Block 2 starts skip-. Forming the length measurement pulses, the control unit 4 blocks itself off from the repeated response to the signal from the comparator 10 output, and the device switches to a normal operation mode.

By determining the ratio of the revolutions of the paper shaft and roll, the measurement accuracy increases because it eliminates the effect of coil winding defects (ellipsolence, eccentricity), the meter circuit makes it possible to achieve even higher measurement accuracy, which is determined by the choice of the quantization step of the signal when counting the ratio of turns.

Improving the accuracy of measuring the length of the head also increases productivity and material savings.

Claims (3)

1. Authors certificate of the USSR 285885, cl. and 06 N 1/00, 1968. 2. USSR author's certificate I 338580, cl. D 21 C, 9/00, 1970. 3. Counter meter BIT-2 for longitudinal cutting machines. Technical Description 96.66.TO CP KTB of the Ministry of Woodworking Latvian SSR, 1973.