SU602253A1 - Device for controlling cutting to length of strip with recurrent corrugations - Google Patents

Description

The unit 13 for cutting the displacement of the cutting line and knives consists of the setting device 16 and the measuring device 17 for the difference of movement of the cutting line and the knives, two schemes 18 and 19 for matching the time offset node 20 of the input signals, the pulse element 21, the converter 22, the code is analogous to the alternating output. The izoj speed setting unit 14 consists of a parabolic amplifier 23, a summing amplifier 24, a diode 25 and a switch 26.

The block 15 for setting the speed for overtaking the knives consists of a knob 27 and a meter 28 for moving the knives, two elements 29, 30 I - and a trigger 31 of the control.

The device works as follows. When moving the strip 9 with periodically repeated corrugations, the sensor 10 corrugations outputs signals to block 11 about the appearance of each corrugation in the sensor ash. At that, the block 11 h) reads the number of corrugations and, when this number becomes equal to the set, a signal is sent to the block 11 from the block 11. By this signal the block 12, using sensors 8 and 10, starts to give signals to the block 13 about moving the LT cut line to the strip from the axis of the sensor 10 corrugations to the flying scissors 3. These signals through the node 20 arrive at the input minus 1 of the meter (reversible counter) 17. The node 20 of the input plus 1 of the meter 17 also receives the signals of the sensor 5 of the LH displacement 3. The node 20. shifts in time signals from sensors 8 and 5, in case of their combination adenomas, and permits to operate without errors meter 17. Previously, at the time of the previous cut, the signal of the sensor used in the cut meter 17 of setter 16 through the coincidence circuit 18 introduced necessary difference of displacements and knife cut line:

LSJ + Dg. - 2PN (1)

hd LS - distance between axes, sensor 10

corrugations and flying scissors 3; L f - the required displacement of the cutting line relative to the center of the intergate gap on the strip 9;

nR; j- knife movement (circumference) between two successive cuts.

When you enter the required difference in the lines of the roz and knives, the gauge 17 outputs a signal ahead of the shears of the shears of the blades of the 3 cutting lines on the strip 9. This signal through the circuit 19 matches and the transducer 22 code - the analog enters the block 14 of setting the speed of the blades only after the knives go scissors 3 from the cut zone, when the second input of the coincidence circuit 19 receives the resolution signal from block 15.

In block 4, the analog signal of the output of converter 22 of the code — analog comes through an amplifier 23 with a parabolic characteristic to the input of summing amplifier 24. To the second input of amplifier 24 with the opposite sign, there is an analog bandwidth of sensor 7 and 7 when the output of amplifier 23 is absent and the key 26 is closed, the sensor 24 sets the amplifier 24 to the motor control system 1 of the flying scissors 3, the blade speed equal to the speed of the band 9. The master signal of the amplifier 24 is processed by the control system 1 with using the sensor 4 speed knives.

c When a signal appears at the output of amplifier 23, the output signal of amplifier 24 decreases and the speed of the blades accordingly decreases. If the output of amplifier 24 decreases to pool or changes sign, then

the scissors stop (the output signal of the opposite sign amplifier 24 is cut off by diode 25). Thus, when the knives come out of the cutting zone by the advance signal by the knives of the cutting line provided by the gauge 17, the flying shears slow down to a full stop (depending on the signal size of the gauge 17).

As the L signal moves the cutter 17 into the meter, the signal at the output 17 decreases, which corresponds to a decrease in the cutting edge advance. In this case, the scissors begin to accelerate and, when the signal at the output of the gauge 17 becomes equal to zero, which corresponds to

1 "± dg-2PN, b" -1 "(2) the speed of the knives is equalized with the speed of the strip. At the same time, the actual difference in the displacement of the cutting line and the knives becomes equal to the set point value.

If for any reason equality (1) in the process of moving the knives is violated, this is fixed by the meter 17 and a signal of the appropriate sign appears at the output of the transducer 22, due to which the control system compensates for the resulting error.

The parabolic amplifier 23 provides the optimal law of reflection by the system 1 controlling a given difference in the displacement of the cutting line and the blades.

At the time of the knives coming off (cutting off the next measured length), the cut sensor 6 is installed through the pulse element 21.

in the state "0 meter (counter) 17, and through the coincidence circuit 18, the required difference in the displacement of the cutting line and knives is inputted from the setting unit 16. At the same time, the sensor 6 sends to the block 12 a signal to prohibit the release of information about the movement of the cutting line b before the block 1 of the resolution signal arrives from the block 1 after the countdown by block 11 of a given number of corrugations. In addition, the cut signal by the sensor 6 is fed to the input of the trigger 31 for placing it into "1 block 15 of the overtaking task. Trigger 31 triggers and removes permission to