SU657410A1 - Flying shears drive control - Google Patents

Description

The present invention relates to automatic control systems and can be used in controlling automated flying scissor electric drives or other mechanisms with variable, cyclically repeated, motion speed graph.

The systems are known that include a setpoint, a reference element, an amplifier-converter multiplication unit, an executive mechanism, executive rollers, sensors, a quad, a filter, a correction block, a non-linear block, and a rectifier p. ,

Of the known sysfs, the closest in technical sushichnost is the flying scissor drive control system, which contains a kazitelno-dividing unit, the first adder, the first input of which is connected to the supreme one of the voltage source, and the second input - to the first input of the second adder measured length

and a key input whose output is through a serially connected motion controller, a speed controller n power amplifier is connected to the drive, a knife displacement sensor connected to the second input of the displacement controller, a knife speed sensor connected to the second speed controller input, a cut sensor, connected to the control input of the key, follow-up rollers, on the shaft of which a rental movement sensor is mounted, connected to the third input of the rolling movement regulator, connected to the third input of the fi emescheni n rolling speed sensor connected to the third input of the speed regulator to the input of the torus n Minimum speed limiter 2

A disadvantage of the known system is that when changing cutting modes, the difference in the frequency of rotation of the scissor drive in pauses between the times either leads to an increase in the engine load for heat, or to an undesirable decrease in the angle of movement of the blades with cutting zone) and, accordingly, to the deterioration of thermal conditions and system accuracy. The purpose of the present invention is to improve the accuracy and reduce the heating of the drive system. The goal is achieved by the fact that a quadrant and an aggregator are installed in the system, the output of which is connected to the top input of the mixing controller, to the house of the quadrant and the first input of the multiplying-positive unit, the second input of which is connected to the output of the minimum speed limiter, the third input to the output the first adder, and the output - with the second input of the second adder, the third input of which is connected to the output of the quad, and the output - to the input of the integrator. The block diagram of the system is shown in the drawing, where the following designations are accepted: knives of flying shears 1, drive 2, knife movement sensor 3, knife speed sensor 4, cutting machine sensor 5, rollers 6 following, rental sensor 7, and rolling speed sensor 8 one, sensor 9 of measured length, key 10, control signal generation unit 11, knife movement controller 12, knife speed controller 13, power amplifier 14, first and second summer 15, 1b multipliers, multiplier-dividing 6inoK 17, integrator 18, quad 19, block 20 limiting minimum speed, the reference source th voltage 21 rental 22. The system of the working footprint of yupim, BrAZ. As the rolling 22 is moved, the control signal generating unit 11 provides control of the drive 2 but, the flying scissors 1 to cut out the shred lengths. The measured length is determined by the setting device 9 of the measured length, from the Cost at the time the knives of the flying metal 1 of the knives come out, fixed by the cutter 5, through the key 10 to the knob 12 regulator 12 of the control signal shaping unit 11 is entered with the sign + value (the error ) UE t-Eo. Where 6 is a given marne, the length of rolled EO is the path of movement of the knives of the flying scissors 1 per cutting cycle. The movement path of the rental 22 is measured by the sensor 7 of the movement of the rental track of the rollers 6, which is connected according to the negative feedback scheme to the input of the regulator 12 of the movement of the blades of the control signal generating unit 11. The path of movement of the knives is measured by the sensor 3 of the movement of knives, which is connected with the + sign to the regulator 12 of the movement of the knives of the control signal generating unit 11, the output of the regulator 12 of the movement of knives is connected to the input of the regulator 13 of the knife speed and sets the last value of the frequency difference of rotation 4 (0 of drive 2 for misalignment error ЕЕ, inputted from sensor 9 of measuring length, The driving signal of sensor 8 for rolling speed and the signal of negative feedback of sensors are also connected to the inputs of knife speed controller 13 Knife speed 4 is 4. A rolling speed sensor 8 sets the speed of the knives with synchronous with the rolling speed in the cutting zone. Functional blocks 15-21 provide for limiting the output signal of the knob movement controller 12 in such a way that the value of the knob 13 for the speed of knives to limit the frequency difference rotation) allowed in this cutting to work out the mismatch DE. and at the same time not to increase the heating of the drive 2 of the knives of flying scissors 1, or not to reduce the angle of movement of the knives of flying scissors 1 with a synchronous speed with rolling 22 (in the area of the cut zone), and accordingly not to worsen the conditions and accuracy of the cut. T, e, AtO value is optimal in all cutting modes. The LoL value is determined by the functional units 15-21 on the basis of the ratio De, t -Abi-Kdaig, where B the path of movement of the knives in the pauses between cuts with a speed different from the speed of movement of rolled products K-constant depending on the magnitude of: acceleration of the drive 2 when developing the mismatch LU. A signal proportional to the optimal value of Lee) appears at the output of the integrator 18, if the output of the integrator 18 is connected to the inputs of the multiplying block 17 and quadr 19, and the output signals of the multiplier-separating block 17 and quadrant 19 are algebraically summed with the signal LE from the sensor 9 measured lengths on the adder 16 and the sum of the signals is fed to B. The output of the integrator 18, In addition, the second multiplier input of the multiplier-dividing block 17 must be fed the sum of the signals В + Вц from the adder 15, and multiplies to the divide input flax divider unit served with the signal from the speed sensor 8 rolled. The ba signal must be passed through block 20 of the minimum speed limit in order to limit the minimum value of this signal at low speeds pc, or when the mill is stopped. The integrator 18 must have an output constraint in order to provide a ratio .t

With the indicated joints .x between the functional blocks 15-20, the output signal of the integrator 18 is proportional to the optimal value of Do in any cutting conditions. The output signal 18 is fed to the input of the limitation of the knob regulator 12 of the control signal generating unit 11 and limits at the level of the frequency difference of rotation of the drive 2.

Thus, due to the new functional blocks and connections in the proposed system, the scissors drive load is reduced in heat, or the undesirable decrease in the angle of movement of the knives with synchronous rolling speed (in the cutting zone) is eliminated and the condition and accuracy of rolling in improved cutting conditions are improved.

Claims (1)

Invention Formula The flying scissor drive control system containing a multiplying-dividing block, ne) cyMMfaTOp,) B1. (Its input is connected to the output of the reference voltage source, and the second input is the first input of the second adder, the output of the set length generator and the key input, the output of which through a serially connected motion controller, a speed controller and a power amplifier connected to the drive, a knife movement sensor connected to the second input of the movement controller, a knife speed sensor connected to the second input of the controller speed sensor. A cut sensor connected to the controllable key input, tracking rollers, on the shaft of which a rolling motion sensor is installed, connected to the third input of the motion controller and a rolled speed sensor connected to the third input of the speed regulator and to the minimum limiter input. speed, characterized in that, in order to improve the accuracy of the system, a quad and an integrator are installed in it, the output of which is connected to the fourth input of the displacement controller, the input of the quad and the first input multiply-divides the second input is connected to the output of the first adder, and the output to the second input of the second adder, the third input is connected to the output of the quad, and the output is 1 with integrator input. Sources of information taken into account in the examination 1, USSR author's certificate № 457О77, in Ob B 11 / O1, 28.12,72, 2, Fishbein V, G., and others. About the methods of implementing Zeison to change the speed of an electric drive of flying scissors. EA Electric drive edition Informelect1. ROG 1975, No. 9/44. fOh-Mi. I / L GTG G r-j-j- 0 L