SU1440627A1 - Apparatus for controlling the flying shears working under conditions of continuous rotation - Google Patents

Abstract

The invention relates to mechanical engineering, in particular, to the design of the control systems of the equipment of flying shears, which perform the cutting of rolled metal on the go for specified dimensional lengths. The purpose of the invention is to improve the cutting accuracy of the cut and improve the quality of the cut. A sequentially connected non-reversible counter, a dynamic moment compensation unit, a second transducer code — voltage, a multiplication unit.,: And also a quadrator, were inserted into the u1chraBLEN device with a flying scissors. - the drive and the shaft of the scissors drums have a speed equalization mechanism. Higher quality. and the accuracy of the rolling cut is ensured with a control device for scoring at the time of cutting speeds with flying scissors and rolled knives. The drive motor speed is stabilized by cyclically pushing the dynamic torque compensation signal on the motor shaft. 1 hp f-ly, 2 ill.

Description

INO P1

The invention relates to mechanical engineering, in particular, to the design of control systems for flying scissors equipment, which make the cutting of rolled products on a Turn for a given dimensional length.

The purpose of the invention is to increase the cutting quality of the cut and improve the quality of the cut.

Fig. 1 shows a functional diagram of a flying scissors control device; figure 2 is a functional diagram of the drive scissors.

The device contains a drive 1 of flying scissors 2, articulated with a drive through the mechanism 3 speed equalization. With scissor drive shaft. tachogenerator (TG) 4, pulse scissor displacement sensor 5 and cut sensor 6 are connected. The transducer 7 is connected by means of measuring rollers 8 to a pulse sensor 9 for moving car.

The digital variable speed control of the volatile shear drive includes a code-frequency converter 10 (as a frequency adjuster), connected to a length setting 11, a reversible counter 12, a first code-voltage converter 13. The analog speed control loop includes a speed controller 14, a drive of 1 flying shears and a TG 4, and a frequency converter 15 — a voltage (as an analog speed indicator). The dynamic moment compensation channel consists of a non-reversible counter 16, a dynamic-torque compensation block 17, a second voltage-code converter 18, a quad, 19, and a multiplication block 20. The drive 1 of the flying scissors contains a podivyuyy electric motor (ED) 21, power amplifier (PA) 22 which can be used, for example, a thyristor converter, and the current driving motor current control loop, which includes a current regulator 23 on the amplifier U and 24 current sensor.

The device works as follows.

Measured cutting of rolled products to specified lengths is carried out due to continuous digital adjustment of the angular velocity of the shear motor in accordance with the expression

P - :

t; -

Vn

 Lj

"

where r

Vn ne

L., linear rental rate; the radius and perimeter of the drums of the flying shears, respectively; set length of the cut sheets.

The implementation of the relation (1) is carried out by forming the frequency of the signal setting the speed of the drive of the volatile scissors in accordance with the expression

f Lf

 t

I, j

(2)

0

five

0

five

0

five

0

where f g, is the frequency signal from the output

imlural displacement sensor 9 proportional to the speed of the strip.

Frequency converter 15 - voltage converts the signal f into a signal proportional to it U, the analog speed reference of the drive. The exact maintenance of the speed of the drive of the volatile scissors, corresponding to the frequency I /, is performed by means of astatic digital control. by means of a reversible counter 12, in which the frequencies of the reference fj and the feedback f from the pulse scissors 5 displacement sensor are compared. The first converter 13 converts the output signal of the reversible counter 12 into an analog signal, the continuously compensating error of the analog scissors drive speed control loop. The speed equalization mechanism 3 converts the uniform rotation of the scissors drive shaft into an uneven rotation of the shaft of the drums of the flying scissors in such a way that, keeping the average speed for the period, ensure equal linear speeds of the shears of the shears at the time of the cut. The magnitude of the eccentricity of the speed equalization mechanism 3 is set depending on the cut length in accordance with the ratio.

  „§ I; jLZ ti g e + L o

(3)

where, E - relative and abso-.

the lute eccentricity of the speed equalization mechanism, respectively;

15

20

25

.

d - the radius of the curve of the moss is scrambled scopTeii.

The uneven rotation of the shaft of the drums of the volatile scissors within each revolution causes a dynamic moment on the shaft of the drive motor, which causes fluctuations in the speed of the shaft of the drive motor, negatively affecting the accuracy of cutting the cut lengths. Since the specified dynamic moment depends on the set eccentricity (. Of the given length of the strip) and is a function of the angle of rotation of the drive shaft

f AWH IB d FCK), (4)

where Ij is the moment of inertia of the drums

flying shears; F (Lj, c /) - relative dynamic

. moment,

those. when the unit angular velocity of the drive shaft and the unit moment of inertia of the flying scissors drums, then to eliminate its effect on the drive motor shaft, it is fully compensated by forming a dynamic current signal Uj and feeding it to the second input R control torus 23 current drive 1 flying scissors. For this purpose, in the non-reversible counter 16 from the moment of the next cut, by counting the pulses of the frequency fjj, the code of the angle of rotation of the drive motor shaft is generated. In block 17, dynamic moment compensation, using codes o and L 5, forms 40 code N dynamic compensation. The dynamic moment compensation unit 17 is made on the basis of a programmable memory element, each memory page of which is determined by 45 code Lj, cell address in each page is code d, h. the contents of each memory cell is the N code of the relative dynamic moment F (L.j, e), 50 corresponding to the current value of the angle of rotation of the shaft for a given cutting length. The code N o in the second converter 18 is transformed into the proportional voltage Id, whose gg in multiplication unit 20 is multiplied by the signal KuJ from the output of the quadrant 19. Thus, at the output of multiplication unit 20

: tU6

five

thirty

ten

35

: tU62 / 4

The signal llf of the form of the dynamic current and in accordance with the ignition (4) is formed.

5 At the time of the cut, the non-reversible counter 16 is zeroed by the signal from the sensor 6 of the cut and the cycle of operation of the device is repeated.

Claims (2)

10 Formula of the invention five 0 five 0 5 0 g 0 .one . A control unit for volatile yunits operating in continuous rotation mode, which contains a drive, a tachogenerator, associated with the shear shaft. pulse scissors movement sensor and cut sensor, pulse movement sensor associated with rolling through measuring rollers, serially connected code-frequency converter, reversible counter, {first code-voltage converter and speed controller, as well as length adjuster, the output of which is connected to the code input of the transducer, the body code to the frequency, the pulse input of which is connected to the output of the pulse pickup sensor, and the output is connected to the input of the frequency converter - voltage The output of which is connected to the second input of the speed regulator, to the third input of which is connected the output of the tachogenerator, the second input of the reversible counter is connected to the output of the pulse scissors displacement sensor, different in that in order to improve the cutting accuracy and improve the cut quality In addition, a non-reversible counter connected in series, a dynamic moment compensation unit, a second converter code - voltage and a multiplication unit, as well as a quadrant and speed equalization mechanism are entered into it. installed between the drive shaft and the shaft of the volatile scissor drum, the output of the pulse scissor displacement sensor is connected to the counting input of a non-reversible counter, the reset input of which is connected to the output of the cutting sensor, the output of the length adjuster is connected to the second input of the dynamic torque compensation unit, and the output of the generator is connected to input quad, the output of which is connected to the second input of the multiplication unit. five the output of which is connected to the second input of the scissor drive. 2. The device according to claim 1, that is, that the dynamic moment compensation unit contains a programmable memory element, each page of which is determined by a code of a given cutting length, address but The cells in each page are determined by the output code of the non-reverse o1-o counter, and the contents of each memory cell is the relative dynamic moment code corresponding to the current value of the angle of rotation of the drive shaft for a given cut length. with eight Phie. i