JPS63303613A - Speed reference generating device for continuous rolling mill - Google Patents

Abstract

PURPOSE:To eliminate the need for a complicated preset control, etc., and to improve the reliability of a rolling mill by providing a ramp generator and switching means on each rolling stand while a plate passing speed ratio set by a speed ratio setter is fixed. CONSTITUTION:When the plate passing speed is changed from a usual condition, first of all, a speed changing command signal S, and its switching timing T1 are inputted into a switching contact point 10 and a flip-flop circuit 12. Then the switching contact point 10 becomes on condition and the flip-flop 12 is set to make the switching contact point 11 on condition. Therefore, the signal to be inputted into the ramp generator 9 is exchanged from the speed reference signal S0 to the speed changing command signal S1 and the speed reference signal S3 from the switching contact point 11 is also switched from the speed reference signal S0 to the speed switching signal S2. Further, by the speed changing signal S2 from the ramp generator 9, the speed value of the speed reference signal S3 is changed to the speed value of the speed changing command signal S1 from the speed value of speed reference signal S0 and the plate passing speed is changed to an arbitrary speed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention aims to automatically control the roll speed of a continuous rolling mill (for example, a group of hot finishing mills) consisting of a plurality of rolling stands. The present invention relates to a device for generating a speed reference.

[Prior Art] FIG. 3 is a block diagram showing a general continuous rolling mill and a speed reference generator for a conventional continuous rolling mill. In the figure, 1 indicates a plurality of rolling stands Fl.

F2. This is a continuous rolling mill consisting of..., in which a first rolling stand F1 is installed on the front entrance side of a second rolling stand F2. 2 is a crop shear that cuts the tip or tail end of the rolled material rolled by the continuous rolling mill 1;
3 is a drive motor for the first rolling stand; 4 is an automatic speed control device (hereinafter referred to as ASR) that controls the speed of the drive motor 3; 5 is a speed reference generator that generates a speed reference signal S0 to the ASR 4; 6 are rolling stands Fl, F2. A common main speed setting device (hereinafter referred to as MRH) that outputs a speed signal for simultaneously raising and lowering the speeds of..., 7 is each rolling stand Fl.

F2. A speed ratio setting device (hereinafter referred to as 5SRH) that outputs the speed ratio for determining the roll speed of ..., 8 multiplies the speed signal from MRH6 and the speed ratio from 5SRH7, and outputs the result as a speed reference signal S0. The speed reference generator i! 5 is composed of MRH 6, 5SRH 7 and multiplier 8. Although not shown in FIG. 3, there is a drive motor.

ASR and 5SRH are also provided for each rolling stand other than the first rolling stand F1.

Next, the operation will be explained. Each rolling stand Fl, F2
．． . . , the tip of the material to be rolled (strip) is set at each rolling stand Fl, F2, . The speed at which it bites into (
(hereinafter referred to as sheet threading speed) is set by the host computer or operator, and at that timing, each rolling stand Fl, F2. . . , 5SRH7 provided for each are preset to the threading speed all at once. At this time, MRH
If 6 is set to 100%, (speed signal from MRH6) x (speed ratio from SSRH7) becomes the threading speed,
A speed reference signal S is given to the ASR4, and each rolling stand Fl, F2 . ... will be operated at the respective set threading speeds.

Next, the material to be rolled is transferred to each rolling stand Fl, F2°...
After all stands are engaged, the rolling speed is increased to the maximum rolling speed at a predetermined timing. In other words, the speed signal set at MRH6 is changed from 100% to the value S
By increasing up to ax, each rolling stand Fl,
F2. The speed of ... is increased all at once while maintaining mass flow balance.

[Problems to be Solved by the Invention] Since the speed control device of the conventional continuous rolling mill is configured as described above, in order to arbitrarily change the speed of each rolling stand Fl, F2°... 5SRH7, for example, after the first rolling stand F1 is caught, the second rolling stand
If there is an abnormality when checking the setting status of rolling and speed before rolling stand F2 bites, and it is necessary to hold the rolled material back and on standby as it is impossible to enter, the preset control of the speed ratio in each 5SRH7 will become complicated. There was a problem.

This invention was made to solve the above-mentioned problems, and it is possible to change the threading speed ratio set in the speed ratio setting device (SSRH). .

The purpose of the present invention is to provide a speed reference generator for a continuous rolling mill, which allows the strip passing speed of each rolling stand to be arbitrarily changed, eliminates the need for complicated preset control, and improves the reliability of the device.

[Means for Solving the Problems] When the speed reference generator for a continuous rolling mill according to the present invention receives a speed change command, it generates the speed change command from a speed value based on a speed reference signal or a speed signal from a main speed setting device. a ramp generator that outputs a speed change signal that changes smoothly to a speed value according to the speed change command; and a switching means that switches the speed reference signal or the speed signal to the speed change signal from the ramp generator when the speed change command is received. It is set up for each stand.

[Function] In the speed reference generator for a continuous rolling mill according to the present invention,
If it is necessary to change the threading speed of only a rolling stand that is operating at a predetermined threading speed, the speed ratio can be changed by giving a speed change command to the ramp generator and switching means provided for each rolling stand. While the speed ratio set by the setting device remains fixed, the speed reference signal or the speed signal from the main speed setting device is switched to the speed change signal from the ramp generator, and the threading speed of each rolling stand is gradually changed. Changes to any speed without shock.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that in the drawings, the same reference numerals as described above indicate the same parts, and therefore the explanation thereof will be omitted.

In FIG. 1, 9 is a ramp generator, and this ramp generator 9 receives a speed reference signal S0 from a multiplier 8 and a speed change command signal Si through a switching contact 10, which will be described later.
8 speed change signals that smoothly change from the speed value according to the speed reference signal S0 to the speed value according to the speed change command signal S1 when the speed reference signal S and the input input sum speed change command signal S□ are switched. On the other hand, when the speed change command signal S This is what is output.

Reference numeral 10 denotes a switching contact as a switching means, which performs a switching operation in response to a switching timing signal T, and outputs a speed reference signal S0 to the ramp generator 9 when the switching timing double amount T1 is off.

When the switching timing signal Ti is on, the speed reference signal S0
Instead, the speed change command signal S1 is sent to the ramp generator 9.
This is what is output to. Further, reference numeral 11 denotes a switching contact as a switching means, which performs a switching operation in response to a switching timing signal T2 from a flip-flop 12, which will be described later, and when this switching timing signal T2 is off, a speed reference signal S is sent to the ASR.
4 (see Figure 3) as the speed reference signal S, and when the switching timing signal T is on, the speed change signal S2 from the ramp generator 9 is output as the speed reference signal to the ASR 4 instead of the speed reference signal S0. This is output as S3.

12 is a flip-flop that outputs a switching timing signal T for switching the switching contact 11;
It is set in response to an on signal of the switching timing signal T1 to turn on the switching timing signal T2, and is reset in response to an on signal from an AND circuit 14, which will be described later, to turn off the switching timing signal T2. moreover,
13 is a comparator that compares the speed reference signal Sll and the speed change signal S3 and outputs a coincidence signal S when they match; 14 receives an inverted signal of the switching timing signal T8 and a coincidence signal S4, and performs an AND operation on them; This is an AND circuit that takes the signal and outputs it to the flip-flop 12.

Note that the lamp generator 9. The switching contacts 10, 11, etc. are connected to rolling stands Fl, F2, . ... (see Figure 3).

Next, the operation of the apparatus of this embodiment will be explained with reference to FIG. 2 (timing chart).
When the vehicle is being operated, switching contacts 10 and 11 are both in the OFF state, and the speed reference signal S0 from the multiplier 8 is
However, the speed reference signal S from the switching contact 11 is ASR.
It is output to 4. At this time, the speed reference signal S0 is also input to the ramp generator 9 via the switching contact 10, and the output from the ramp generator 9 is also equal to the speed reference signal S0.

When changing the sheet threading speed from such a state, first input the speed change command signal S and its switching timing signal T to the switching contact 1o and the flip-flop 12, and then the switching contact 10 is turned on. At the same time, the flip-flop 12 is set and the switching contact 11 is also turned on. As a result, the signal input to the ramp generator 9 changes from the speed reference signal S0 to the speed change command signal S1.
At the same time, the speed reference signal S3 from the switching contact 11 also switches from the speed reference signal S0 to the speed change signal S2. Then, due to the speed change signal S2 from the ramp generator 9, the speed reference signal S3 input to the ASR 4 changes smoothly from the speed value according to the speed reference signal S0 to the speed value according to the speed change command signal S□, and The speed can be changed to any speed without shock.

In addition, when returning the sheet threading speed to the normal sheet threading speed using the speed reference signal S from the state where the sheet threading speed has been changed as described above,
By turning off the switching timing signal T1, the switching contact 10 is turned off, and the signal input to the ramp generator 9 changes from the speed change signal S2 to the speed reference signal S.
0, the speed change signal S from the ramp generator 9 and the speed reference signal Sa from the round switching contact 11)
gradually returns from the speed value based on the speed change command signal S□ to the speed value based on the speed reference signal S0. At this point,
Flip-flop 12 is still set, switching contact 1
1 is also in the on state, and the speed reference signal S from the switching contact 11 becomes the speed change signal S8 from the ramp generator 9. Then, the comparator 13 compares the speed reference signal S0 and the eight speed change signals, and when they match, outputs a match signal S, thereby turning on the output from the AND circuit 14 and resetting the flip-flop 12. be done. As a result, the switching contact 11 is turned off, and the speed reference signal S from the switching contact 11 is switched from eight speed change signals to the speed reference signal S6 without a shock.

As described above, according to the apparatus of this embodiment, by providing the lamp generator 9, each rolling stand Fl, F2
．． In addition to being able to change the threading speed for each time from the speed value based on the speed reference signal S from the multiplier 8 to an arbitrary speed without shock, the threading speed can be changed from the changed arbitrary threading speed to the normal speed. Since it is possible to return to the speed value based on the speed reference signal S0 without a shock, the threading speed ratio set by 5SRH7 can remain fixed, eliminating the need for complicated preset control, etc. This greatly improves the reliability of the system.

In the above embodiment, the speed reference signal S from the 1 multiplier 8
0 and the speed change signal S2 from the ramp generator 9 has been described, but the speed signal from the MRH 6 and the speed change signal S2 from the ramp generator 9
The reference speed signal S0 outputted from the multiplier 8 may be changed as a configuration for switching between the two, and in this case as well, the same effects as in the above embodiment can be achieved.

[Effects of the Invention] As described above, according to the present invention, by providing a ramp generator and a switching means for each rolling stand, the threading speed of each rolling stand can be changed from a speed value based on a speed reference signal to an arbitrary speed. Since it is configured so that it can be changed without shock, the threading speed ratio set by the speed ratio setting device can remain fixed, eliminating the need for complex preset control, etc., and improving the reliability of the continuous rolling mill. It has the effect of significantly improving.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a speed reference generating device for a continuous rolling mill according to an embodiment of the present invention, Fig. 2 is a timing chart for explaining the operation of the device of the above embodiment, and Fig. 3 is a general FIG. 2 is a block diagram showing a continuous rolling mill and a speed reference generator for a conventional continuous rolling mill. In the figure, 1 - continuous rolling mill, 6 - main speed setting machine (MR
H), 7 - speed ratio setter (SSRH), 9 - ramp generator, 10.11 - switching contact as switching means,
Fl, F2. ...-Rolling stand. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In order to control the threading speed of each of the above-mentioned rolling stands in a continuous rolling mill consisting of a plurality of rolling stands, a main speed that outputs a speed signal for simultaneously raising and lowering the threading speed of the plurality of rolling stands. A setting device, and a speed ratio setting device provided for each of the plurality of rolling stands and outputting a speed ratio for determining the threading speed of each of these rolling stands, and a speed signal from the main speed setting device and a speed ratio setting device. In a speed reference generator of a continuous rolling mill that outputs the product of the speed ratio from the speed ratio setter as a speed reference signal to each of the rolling stands described above, when a speed change command is received, the speed reference signal or speed signal is generated. A ramp generator that outputs a speed change signal that changes smoothly from a speed value according to the speed change command to a speed value according to the speed change command, and a speed change signal from the ramp generator that outputs the speed reference signal or the speed signal when the speed change command is received. A speed reference generating device for a continuous rolling mill, characterized in that a switching means for switching to the above-mentioned rolling stand is provided for each of the rolling stands.