JPH0790253B2 - Control circuit of wire drawing machine line - Google Patents

Description

The present invention relates to a wire drawing machine capable of avoiding inconveniences such as wire breakage while the wire rod is running at a low speed, such as when starting a wire drawing machine line equipped with a dancer roll. It relates to a line control circuit.

[Conventional technology]

FIG. 2 is a control block diagram showing a conventional example of control of a wire drawing machine line provided with a dancer roll.

In FIG. 2, the wire rod 2 running from the left side to the right side in the direction of the arrow is drawn by the first wire drawing machine 10 composed of the die 11, the drum 12, the electric motor 13, and the speed transmitter 14, Dice 21, drum 22, electric motor 23 and speed transmitter 24
The wire drawing is performed again by the second wire drawing machine 20 which is composed of and. However, in the middle of the first wire drawing machine 10 and the second wire drawing machine 20, the wire rod traveling speed of both wire drawing machines. The dancer roll 30 is installed in order to absorb the difference.

For example, if the wire rod traveling speed of the first wire drawing machine 10 is higher than the wire rod traveling speed of the second wire drawing machine 20, the amount of the wire rod 2 retained between both wire drawing machines increases. The dancer roll 30 moves downward to store the increased wire rod. If the speed of the first wire drawing machine 10 is slower, the dancer roll 30 moves upward and discharges the accumulated wire rod.

A position detector 31 (for example, a synchro oscillator) for detecting the position is coupled to the dancer roll 30, and the position detection signal output from the position detector 31 is made positive by the diode 32, It is input to the position adjuster 34 composed of a proportional-plus-integral calculator. On the other hand, the position setter 33 sets a predetermined position of the dancer roll 30 with a negative polarity signal and inputs it to the position adjuster 34. Therefore, the position adjuster 34 outputs to the adder 16 a control signal that makes the deviation between the position detection signal and the position setting signal zero by the adjusting operation.

The running speed of the wire rod 2 is set by the speed setting device 3. The speed setting value of the speed setting device 3 is set to prevent a sudden change in the speed when the wire drawing machine line is started or stopped. The acceleration / deceleration calculator 4 produces a speed command value that changes at a predetermined change speed, which is input to the speed control device 25 for the second wire drawing machine 20. This speed control device 25 includes a speed transmitter 24
Control is performed so that the actual speed value fed back from the above is matched with the above-mentioned speed command value.

The speed command value output from the acceleration / deceleration calculator 4 is calculated by the adder 16
After that, the speed control device 15 for the first wire drawing machine 10 is also input.
This speed control device 15 also performs control to match the actual speed value fed back from the speed transmitter 14 with the output signal of the adder 16 in the same manner as above. However, wire 2 is die 21
Since the wire is drawn by, the cross-sectional area of the wire 2 is different between the entrance side and the exit side of the die 21. Therefore, the ratio of the wire running speed on the die 21 entry side to the wire running speed on the die 21 exit side is
Since the value corresponds to the area reduction rate, if the speed of the second wire drawing machine 20 is used as a reference, it is necessary to reduce the speed of the first wire drawing machine 10 according to this area reduction rate. The ratio setter for covering this surface reduction rate is an acceleration / deceleration calculator 4 and an adder.
Although it is inserted between 16 and 16, its illustration is omitted in FIG.

As described above, when the dancer roll 30 is displaced from the predetermined position, the first wire drawing machine is used to return the dancer roll 30 to the predetermined position.
10 speeds need to be increased or decreased. Therefore, the output of the position adjuster 34 is added as a correction signal to the speed command value to change the speed of the first wire drawing machine 10.

[Problems to be Solved by the Invention]

If the value of the correction signal output by the position adjuster 34 is small, it is difficult for the correction effect to appear. Therefore, the maximum value of this correction amount is
Generally, it is set to about 10% of the maximum speed. That is, assuming that the maximum value of the speed command value input to the adder 16 is N, the maximum correction amount is ± 0.1N.

Therefore, when the dancer roll 30 is in the upper limit position immediately after the speed rises from zero, for example, when starting the wire drawing machine line, the maximum correction signal of 0.1 N is added to the small speed command value. The speed change of the first wire drawing machine 10 becomes too large, which causes inconvenience such as disconnection. Further, when the dancer roll 30 is at the lower limit position, the maximum correction signal of -0.1N is added to the small speed command value, so the result of this addition becomes a negative value, and the first wire drawing machine 10 reversely rotates. There was also.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to prevent the wire drawing machine line from being broken at the time of low speed operation or from being reversed in the wire drawing machine due to the correction signal for correcting the position of the dancer roll.

[Means for Solving the Problems]

In order to achieve the above object, the control circuit of the present invention is
A first wire drawing machine and a second wire drawing machine, each of which is provided with a speed control means separately, and a position adjusting means, which is located between the first wire drawing machine and the second wire drawing machine, in order to absorb the speed difference between the wire rods passing through the both wire drawing machines. And a speed command value that changes at a predetermined changing speed is given to each of the first and second wire drawing machine speed control means of the wire drawing machine line configured by a dancer roll, and In the control circuit of the wire drawing machine line, which adds the output of the dancer roll position adjusting means to the speed command value given to the first wire drawing machine, the output of the dancer roll position adjusting means and the first wire drawing machine. Means for performing a multiplication operation with the speed command value given to the first wire drawing machine, and means for adding the multiplication result to the speed command value given to the first wire drawing machine.

[Action]

The present invention configures the circuit so that the magnitude of the correction signal for correcting the position of the dancer roll is not an absolute amount but a value proportional to the speed command value at that time, so that the wire drawing machine line Even when the vehicle is operating at a low speed, an attempt is made to prevent disconnection due to a sudden increase in speed or reverse rotation operation with an excessive correction signal.

〔Example〕

FIG. 1 is a control block diagram showing an embodiment of the present invention.

In FIG. 1, a wire rod 2, a speed setter 3, an acceleration / deceleration calculator 4, a first wire drawing machine 10 and its speed control device 15, an adder
16, second wire drawing machine 20 and its speed control device 25, dancer roll
The names, applications, and functions of 30, position transmitter 31, diode 32, position setter 33, and position adjuster 34 are the same as in the case of the conventional circuit described above with reference to FIG. Omit it. Further, the illustration of the ratio setting device for responding to the area reduction rate associated with the wire drawing of the wire rod 2 is omitted.
This is similar to the conventional circuit shown in the figure.

In the present invention, a multiplier 40 for multiplying the output of the position adjuster 34 and the output of the acceleration / deceleration calculator 4 is provided, and the output of the multiplier 40 is provided to the adder 16.

That is, assuming that the signal output from the position adjuster 34 is 10% at the maximum, 10% of the speed command value output from the acceleration / deceleration calculator 4 is output from the multiplier 40 as a correction signal. The signal input to the device 15 is a value obtained by adding or subtracting 10% of the speed command value at that time, even if the correction amount is the maximum.

〔The invention's effect〕

According to the present invention, the amount of the correction signal for correcting the position of the dancer roll is configured so that the amount of the correction signal becomes a value proportional to the speed command value at that time. , There is no fear that an excessive amount of correction will be added or subtracted compared to the speed command value at that time, and therefore, there will be a disconnection caused by a sudden change in speed, or the rotation direction of the wire drawing machine will be reversed. It has the effect of avoiding inconvenience.

[Brief description of drawings]

FIG. 1 is a control block diagram showing an embodiment of the present invention, and FIG. 2 is a control block diagram showing a conventional example of control of a wire drawing machine line provided with a dancer roll. 2 ... Wire rod, 3 ... Speed setting device, 4 ... Acceleration / deceleration calculator, 10 ... First wire drawing machine, 11,21 ... Die, 12,22 ... Drum, 13,23 ... Electric motor, 14,24 …… Speed transmitter, 15,25
...... Speed control device, 16 …… Adder, 20 …… Second wire drawing machine,
30 …… Dancer roll, 31 …… Position transmitter, 32 …… Diode, 33 …… Positioner, 34 …… Position adjuster, 40 …… Multiplier.

Claims (1)

[Claims] 1. A first wire drawing machine and a second wire drawing machine, each of which is provided with a speed control means separately, and a position intermediate between the first wire drawing machine and the second wire drawing machine so as to absorb the speed difference between the wire rods passing through these wire drawing machines. Each of the first and second wire drawing machine speed control means of the wire drawing machine line configured with a dancer roll having an adjusting means,
A wire drawing machine that gives a speed command value that changes at a predetermined change speed through an acceleration / deceleration calculation means and adds the output of the dancer roll position adjusting means to a speed command value given to the first wire drawing machine. In a line control circuit, means for performing a multiplication operation of the output of the dancer roll position adjusting means and a speed command value given to the first wire drawing machine, and a speed command giving the multiplication result to the first wire drawing machine. A control circuit for a wire-drawing machine line, which is provided with a means for adding to the value.