JP3144189B2 - Casting speed setting control method for continuous casting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting speed setting control method in a continuous casting facility.

[0002]

2. Description of the Related Art Such a prior art will be described step by step. In the drawings, the same reference numerals represent the same or corresponding members. FIG. 3 is a block diagram showing a circuit configuration of a main weight portion of the first conventional example. In the case of starting acceleration, the value of the sliding variable resistor 6 [Vcc is a constant DC voltage source and 0v is grounded] provided in the speed setting device 10 is changed by rotating the knob 1a connected thereto. By changing the speed, adjusting the speed command value and closing the contact of the main circuit switch 3,
The speed command value from the speed setting device 10 is given to the soft starter 7, and the soft starter 7 speeds up according to the speed rising characteristic curve 7a at a predetermined acceleration [time constant] which is set in advance. Until you reach [+]
When the speed rises with acceleration and reaches a steady value which is a speed command value, the speed command 5 is output at that speed unless the command is changed thereafter, and the molded slab after pouring hot water from the gate to the mold. Is pulled out by rotation of a pinch roll.
The speed command 5 is controlled as indicated by the characteristic curve 7a. In the case of the deceleration stop, the release of the contact of the changeover switch 3 or the setting value of the speed setting device 10 is returned to zero, so that the speed is increased at exactly the same [-] acceleration as that of the speed rising characteristic curve 7a. A descent is made, leading to a stop. In the block diagram of the circuit configuration of the main weight of the second conventional example shown in FIG.
As in the case of the speed setting unit 20, two continuous places are provided in one continuous casting facility, for example, a central control room for integrally monitoring the continuous casting site and the vicinity of the mold. The speed setting device 10 has a sliding variable resistor 6a and a shooting 1a
The speed setting unit 20 has a sliding variable resistor 6b and
b, the outputs of which enter the contacts 3a and 3b of the changeover switch 3, respectively. These contacts 3a and 3b are alternatives and only one of them is conductive and the other is open. One of these speed commands is given to the soft starter 7, and the subsequent operation is shown in FIG. The description is omitted because it is the same as [First Conventional Example]. FIG.
FIG. 4 is a block diagram showing a circuit configuration of a main portion of the conventional example.
In this embodiment, two setting devices are used as shown in FIG.
This is the case where they are distributed and installed at locations. The speed setting device 10 has a contact 3 of a switching contact switch 3 in which a speed-up contact 8a and a deceleration contact 8c each formed of, for example, a cam switch are provided in parallel.
a and the contact 3c are connected to the up input terminal and the down input terminal of the increase / decrease controller 9, and the speed setting device 20 is also provided with a speed-increasing contact 8b and a deceleration contact 8d in parallel, respectively. The switching switch 3 is connected to the up input terminal and the down input terminal of the increase / decrease controller 9 via the contact 3b and the contact 3d. In this embodiment, the speed-increasing contacts 8a and 8b
Alternatively, the speed command is issued by repeatedly turning on and off the deceleration contacts 8c and 8d artificially, and the speed command 5 from the increase / decrease controller 9 is changed [four options] according to the increase or decrease.
That is, as shown in FIG. 5, the speed setting is performed by the speed increase / decrease switches 8a to 8a without taking the speed, and the speed increase / decrease controller 9 increases the speed command at the time of [increase] operation, and the speed increase / decrease control at the time of [deceleration] operation. The speed setting is performed by the device 9 by reducing the speed command.

[0003]

However, the prior art using such photographing [first and second prior art examples, FIGS. 3 and 4].
In the case where a plurality of setting places are switched, if the setting levels of the setting devices do not reach the same level, a difference occurs in the speed command output and the speed fluctuates. In a continuous casting facility, fluctuations in casting speed have a great effect on the quality of slabs to be manufactured, and thus operators are forced to switch the setting place after adjusting the speed setting to the same level. Further, according to a setting method by turning on / off a speed increase / decrease contact of a speed increasing / decreasing switch [third conventional example, FIG. 5],
There is no speed fluctuation when switching the operation place,
As compared with the conventional setting method by taking a picture, there is a drawback that the operation feeling cannot be grasped and the operation of repeatedly turning on and off the cam contact is difficult.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a method for setting a casting speed in a continuous casting facility, comprising: a forward / reverse rotation of a manual pulse generator for generating a pulse signal in accordance with a rotation amount; Based on the direction, the sign of the change amount of the casting speed is switched between plus and minus, and the pulse of the manual pulse generator is input to a speed increase / decrease calculation unit, and the change amount of the input pulse number per unit time is calculated as the change amount of the casting speed. This is a casting speed setting control method for a continuous casting facility that outputs a casting speed by converting it into a change amount. That is, according to the present invention, the speed command is increased / decreased and output by counting the increase / decrease pulses obtained by rotating the pulse generator attached to the setting / setting of the casting speed. This is a casting speed setting control method for a continuous casting facility capable of setting a speed without changing the speed even when setting places are switched, while maintaining the conventional operational feeling.

[0005]

According to the present invention, the above-mentioned means can be used to change the set location by a speed command along a smooth speed command characteristic curve without a sudden speed change even when the set place is changed without impairing the operation feeling of the operator. Can be realized.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the block diagram of the main circuit shown in FIG. FIG. 1 shows an embodiment in the case of setting two places of a speed setting device 10 and a speed setting device 20. The same applies in principle even if more speed setting devices are installed. Shooting of speed setting devices 10 and 20 1a, 1b
Are pulse generators PLG2a and PLG2b, respectively.
Attached to the rotating shaft. These pulse generators PLG2a and PLG2b are well known and have an electrical angle of 9
This is an incremental output type pulse generator that outputs two square wave signals A and B having different phases of 0 ° according to the amount of rotation of the rotating shaft. In the present invention, the incremental pulse generator PLG2a or PLG2
A speed setting shooting 1a or 1b to be manually rotated is connected to the rotation shaft of b, and by rotating this shooting 1a or 1b, the pulse output from the incremental pulse generator is switched. The signal is supplied to the speed increasing / decreasing operation unit 4 via the signal switching means of the switch 3, and the pulse amount from the above-described incremental pulse generator is converted into a change in the casting speed by the conversion unit 4a.
The pulse is output from the rotating pulse generators PLG2a and PLG2b in accordance with the amount and speed of change. here,
The pulse outputs of the pulse generators PLG2a and PLG2b are supplied to the speed increase / decrease calculator 4 via the contact 3a or the contact 3b of the alternative switch 3. The pulses from the pulse generators PLG2a and PLG2b are converted by the speed increase / decrease calculator 4 into a speed increase / decrease ΔV such that the increment of one pulse is, for example, 1 m / min. By the way, if 1 m / min / pulse,
ΔV = + 1 m / min as the pulse increases, and ΔV = −1 m / min as the pulse decreases. As a result, the speed command output V
c is the speed command Vc + ΔV immediately before the pulse change.
Are sequentially output. The speed increase / decrease calculator 4
Can be performed by software calculation using a computer. Further, although not shown, a simple soft starter is provided at the next stage of the speed increase / decrease arithmetic unit 4 so that the soft starter can be adapted to the steep rise of the speed in accordance with the rotation speed of the shooting. May be provided for automatically inserting or short-circuiting. That is, in the present invention, when starting from a stop or further increasing the speed, the shooting is rotated in the forward direction, and the continuous casting increase [+] acceleration is set by the rotation speed of the shooting. The continuous casting steady speed is set according to the mechanical angle at which the shooting has been rotated, and when shifting from a continuous casting operation state at a certain steady speed to deceleration or stop, the shooting is rotated in the opposite direction, and the shooting is performed. Continuous casting equipment that sets the continuous casting reduction [-] acceleration according to the rotation speed and sets the continuous casting steady speed that is decelerated according to the mechanical angle at which the shot was taken, or sets the stop by returning to the starting point. It can be said that this is a casting speed setting control method. When the speed setting location is switched, the pulse generators for speed setting PLG2a and PLG2b are switched, but the speed does not fluctuate because no increase or decrease of the pulse occurs. The output of the two signal pulses A and B from the incremental pulse generator is such that the A pulse precedes the B pulse signal when the rotation is forward (speed increase) and the B pulse is the A pulse when the rotation is reverse (speed decrease). , The direction of the speed change is determined and calculated by the speed increase / decrease calculator 4. FIG. 2 is a block diagram showing a circuit configuration of another embodiment of the present invention. This is a circuit configuration in which a sequence controller 40 is applied to the speed increase / decrease operation circuit of the embodiment of FIG. Pulse generator PLG2 for speed setting
a, the pulse waveform signal from the PLG 2b enters the counter input means 42a, 42b of the counter input module 41,
The waveform is shaped and the rotation direction is determined by the rotation direction determination means 43a and 43b, and the count value calculation means (counter) 44a,
44b, the number of shaped pulses is calculated, and the changeover switch 3a,
The counter value is read by the counter value reading means 46 via any of 3b. However, the previous value stored in the counter is read by the counter value reading means 46 as the current value by switching the changeover switches 3a and 3b in the previous value storage means 45. Therefore, the pulse increase / decrease value calculation means 47 calculates the pulse increase / decrease value ΔPulse = the current read value−the previous read value,
The pulse increase / decrease value is returned to the next counter value reading means 46 and used for the next increase / decrease calculation, and is sent to the speed command output calculating means 48 where the speed command output V
c = previous Vc + ΔPulse × K where K = ΔVc / Δ
Pulse, and ΔVc = current Vc−previous Vc. Thus, the current Vc output from the speed command output means 48 becomes the speed command output 5. by the way,
In addition to the illustrated sequence controller, for example, a programmable sequence controller, a programmable controller, a PLC, and the like can be applied. As described above, the present embodiment provides an incremental pulse generator that outputs two square wave signals A and B having phases different from each other by 90 ° in electrical angle in accordance with the amount of rotation of the rotating shaft in the casting speed setting controller in the continuous casting equipment. A speed setting photographing unit for manually rotating the rotating shaft is provided in series, a pulse output from the incremental pulse generator is provided to a speed increasing / decreasing calculation unit, and the pulse amount is converted into a change in casting speed. In order to output the casting speed and to start from a stop or to further increase the speed, the above-described shooting is rotated in the forward direction, and the continuous casting increase acceleration is set according to the rotation speed of the shooting. The continuous casting steady speed is set according to the rotated mechanical angle, and when shifting from the continuous casting operation state at a certain steady speed to deceleration or stop, the above-described shooting is rotated in the opposite direction. Then, the continuous casting reduction acceleration is set according to the rotation speed of the shooting, and the continuous casting steady speed is reduced according to the mechanical angle at which the shooting is rotated, or the stop is set by returning to the starting point. ing. That is, the present invention provides a method of setting a casting speed in a continuous casting facility, wherein the sign of the variation of the casting speed is minus or minus based on the forward / reverse rotation direction of a manual pulse generator that generates a pulse signal in accordance with the amount of rotation. At the same time, the pulse of the manual pulse generator is input to the speed increasing / decreasing calculation unit, and the variation of the number of input pulses per unit time is converted into the variation of the casting speed to output the casting speed. This is a setting control method.

[0007]

As described above, in the casting speed setting control method according to the present invention, the speed is not changed and the speed is not changed even when the speed is changed, such as when the setting is changed, without impairing the sense of the operator who turns the shooting. It is possible to realize a continuous casting method capable of performing operations. Also, as a speed command output method, by giving the speed at which shooting is performed as a factor, casting can respond to more advanced operation demands, such as increasing the speed change if the shooting is rotated quickly even if the rotation amount of shooting is the same. Speed setting control can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of a main part of an embodiment of the present invention.

FIG. 2 is a block diagram showing a circuit configuration of a main part in another embodiment of the present invention.

FIG. 3 is a block diagram showing a circuit configuration in a case where the shooting speed is set to one place in the first conventional example.

FIG. 4 is a block diagram showing a circuit configuration in a case where two shooting speeds are set in a second conventional example.

FIG. 5 is a block diagram showing a circuit configuration of a main part in a third conventional example.

[Explanation of symbols]

1a Shooting for speed setting 1b Shooting for speed setting 2a Incremental pulse generator 2b Incremental pulse generator 3 Operating location changeover switch 3a Switch 3 contact 3b Switch 3 contact 3c Switch 3 contact 3d Switch 3 contact 4 Speed increase / decrease Arithmetic unit 4a Conversion unit from pulse of speed increase / decrease calculator to ΔV 4b Calculation output unit for calculating and outputting speed command output Vc [casting speed command] by speed increase / decrease calculator 5 Speed command output 6 Sliding variable resistor 6a Slider Dynamic variable resistor 6b Sliding variable resistor 7 Soft starter 8a Speed-up switch 8b Speed-up switch 8c Deceleration switch 8d Deceleration switch 9 Increase / decrease controller 40 Sequence controller 41 Counter input module 42a Counter input means 42b Counter input means 43a Rotation direction judgment Means 43b Rotation direction judgment means 4a count value calculating means 44b count value calculating means 45 the previous value storage unit 46 counter value reading means 47 increases or decreases the pulse value calculating unit 48 the speed command output calculation means

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B22D 11/20

Claims (1)

(57) [Claims] 1. A method for setting a casting speed in a continuous casting facility, wherein the sign of the change in the casting speed is plus / minus based on the forward / reverse rotation direction of a manual pulse generator that generates a pulse signal in accordance with the amount of rotation. And switch to
The pulse of the manual pulse generator is input to a speed increasing / decreasing calculation unit, and the amount of change in the number of input pulses per unit time is converted into the amount of change in casting speed to output the casting speed. Speed setting control method.