JPS6211925B2 - - Google Patents

Description

Detailed Description of the Invention The present invention provides a jamming detection device for detecting whether a rolled material is bitten (metal-in) or released (metal-off) in a rolling mill that rolls rolled materials such as steel plates. It is related to.

Generally, these metal-in/metal-off signals are necessary for automatic control of various rolling machines, and are used for tracking the material position on the rolling line and the start/end timing of various automatic controls. It will be done. Therefore, if the metal-in/metal-off signal cannot be detected accurately, the control accuracy of various types of automatic operation will decrease, or automatic operation will not be possible.

Conventionally, as this type of jamming detection device, the first
The one shown in the figure is known. In Figure 1,
Reference numeral 1 indicates a rolling mill, and the rolling material 2 is rolled by this rolling mill. A rolling reaction force detection device 3 outputs a rolling reaction force signal, and detects a rolling reaction force generated when the rolling mill 1 rolls the rolled material 2.
4a and 4b are comparators, and the comparator 4a outputs a biting signal as described later.
A biting release signal is outputted from b, these signals are input to the storage device 5, and as will be described later, a signal indicating that biting is in progress is outputted to the output terminal 6 thereof. The comparator 4a compares the rolling reaction force signal with a separately set jamming detection level signal, and outputs the jamming signal when the rolling reaction force signal becomes larger than the jamming detection level signal. Further, the comparator 4b compares the rolling reaction force signal with a separately set release detection level signal, and outputs the release signal when the rolling reaction force signal becomes smaller than the release detection level signal. Once the biting signal is input, the storage device 5 is set to output the fact that the biting is in progress, and this state is maintained until the next biting and releasing signal is input. It will be reset.

In the device shown in Fig. 1 above, the biting detection level is, for example, 400 tons, and the biting and releasing detection level is 400 tons.
300ton, and the rolling reaction force before the rolled material 2 is bitten by the rolling mill 1 is 0ton. At this time, the comparator 4a does not output a biting signal, and the comparator 4b outputs a biting signal. Since the signal is output, no signal indicating that biting is in progress is obtained at the terminal 6. Next, when the rolled material 2 is bitten by the rolling mill 1, the rolling reaction force becomes 400 tons or more, and a biting signal is output from the comparator 4a.
The storage device is set so that the bit-release signal from the comparator 4b is no longer obtained, and the bit-in process signal is outputted to the terminal 6. When the rolled material 2 is released from the rolling mill 1, the rolling reaction force becomes less than 300 tons, and the above-mentioned bite signal cannot be obtained.
Since only the release signal is generated, the memory device 5 is reset and the signal indicating the bit is not being output is output to the terminal 6.

By the way, in a rolling mill, in general, before biting the material to be rolled, the gap between the rolls of the rolling mill is tightened to create a kiss roll state, and then the material to be rolled is bitten and rolled. In this kiss roll state, the rolling reaction force
It exceeds 400 tons and reaches 600 tons (during rolling
(up to 1200 tons), and in this case, the release signal is not output before the bite, during the bite, and after the bit is released, but only the bite signal is output, and the storage device remains in the set state. Therefore, there was a drawback that accurate metal-in/metal-off detection could not be performed.

A jamming detection device shown in FIG. 2 is also known as a device that eliminates this drawback. In FIG. 2, the same reference numerals as in FIG. 1 indicate the same elements. Differentiators 7a and 7b respectively differentiate the rolling reaction force signal from the rolling reaction force detection device 3 and supply the result to comparators 8a and 8b. This differentiator 7a detects when the rolled material 2 is bitten into the rolling mill 1, that is, the rise of the rolling reaction force signal,
This rising differential signal is compared with a separately set fixed level signal in the comparator 8a, and if it exceeds this level, a biting signal is output. The differentiator 7b detects when the rolled material 2 is released from the rolling mill 1, that is, the falling of the rolling reaction force signal, and the differential signal of this falling is set at a fixed level separately set in the comparator 8b. When the biting signal exceeds the certain level, a biting and releasing signal is output, and these biting and releasing signals are input to the storage device 5 in the same manner as in FIG.

In the jam detection device having the above-mentioned differentiators 7a and 7b, the jam detection device may erroneously detect jam or release due to rolling reaction force signal noise and fluctuations in the rolling reaction force during rolling. The drawback was that the operation as a blockage detection device lacked stability.

In addition, as a conventional device, as shown in FIG. 3, the rolling reaction force signal from the rolling reaction force detection device 3 is
Comparators 4a, 4b explained in the figure and comparators 8a, 8b via differentiators 7a, 7b explained in FIG.
and these comparators 4a, 8a and 4b,
8b and outputs from AND gates 9a and 9b, respectively.
There is also known a device in which the outputs of these AND gates are supplied to the memory device 5. In FIG. 3, the same reference numerals as in FIGS. 1 and 2 indicate the same elements.

The device shown in FIG. 3 has the disadvantage that if the rise or fall of the rolling reaction force signal is slow, it is not possible to detect biting and releasing.
Also, like the one shown in FIG. 2, it has the disadvantage of lacking operational stability, such as erroneous detection due to fluctuations in the rolling reaction force during rolling as described above.

As described above, conventional devices that detect the level of the rolling reaction force signal cannot accurately detect metal-in/metal-off during kiss roll rolling, and also detect the level of the differential signal of the rolling reaction force signal. However, the detection operation becomes unstable due to noise and the like.

The present invention eliminates the above-mentioned conventional drawbacks and provides a jamming detection device that can accurately detect metal-in/metal-off even in kiss roll rolling or the like.

An embodiment of the present invention will now be described in detail with reference to FIG. In FIG. 4, the same reference numerals as in FIG. 1 indicate the same effects. Reference numeral 10 denotes a rolled material detector installed on the input side of the rolling mill 1, which detects the presence or absence of the rolled material 2 and supplies the detection signal to the first storage device 11a and the second storage device 11b. It is something. These storage devices 11a, 11
A rolling reaction force signal from the rolling reaction force detection device 3 described above is input to b. When the rolled material detector 10 detects that there is no rolled material 2, this detection signal causes the storage device 11a to directly output the input rolling reaction force signal from the rolling reaction force detection device 3. However, when the presence of the rolled material 2 is detected, the input rolling reaction force signal at the time of this detection is stored and output. The above storage device 1
When a detection signal indicating that there is a rolled material 2 on the roll 1b is supplied from the rolled material detector 10, the storage device 11b outputs the input rolling reaction force signal as it is, and when the detection signal indicates that there is no rolled material 2 When this is indicated, the input rolling reaction force signal at this point is stored and output. These storage devices 11a, 11b
The output signals of are input to subtracters 12a and 12b,
These signals are subtracted from the rolling reaction force signal from the rolling reaction force detection device 3, and this subtracted output signal is input to the comparators 4a and 4b described above.

In such a jamming detection device, when the rolled material 2 is not caught in the rolling mill 1, the rolling reaction force signal is small as shown in a in FIG. 5A, and when the rolled material 2 is caught, , b becomes large. On the other hand, as shown in FIG. 5B, the rolled material detector 10 obtains a detection signal indicating that the rolled material 2 is present during the period indicated by the diagonal line c. These rolling reaction force signals and detection signals are supplied to the storage device 11a, and as shown in FIG. In the period indicated by the diagonal line c, the first rolling reaction force signal of this period is stored and outputted as shown by e during this period. Further, the rolling reaction force signal and the detection signal are also supplied to the storage device 11b, and during the period indicated by the diagonal line c, the rolling reaction force signal is output as is, as shown in f and g of FIG. 5D. In other periods, the first rolling reaction force signal of this period is stored as shown in h, and is output during periods other than the shaded periods. FIG. 5 E and F indicate the subtractor 12
These subtracters output signals obtained by subtracting the outputs from the storage devices 11a and 11b shown in C and D from the rolling reaction force signal in A. These E,
The outputs of the subtracters 12a and 12b shown at F are compared with the biting detection level signals (predetermined values) shown at i and j in FIGS. 5E and F by the comparators 4a and 4b. The comparator 4a outputs the biting signal shown in FIG. 5G when the signal indicated by E is equal to or greater than the predetermined value (for example, 300 tons), and the comparator 4b outputs the signal indicated by F when the signal indicated by F exceeds the predetermined value (for example, 300 tons). For example -300ton)
In the following cases, the release signal shown in FIG. 5H is output. These bite and release signals are supplied to the memory device 5 as described above, and the memory device is set by the bite signal and reset by the release signal, and only during this setting period is the memory device 5 shown in FIG. A signal indicating that biting is in progress is output to terminal 6.

In the above embodiment, the case where there is one rolling mill 1 was explained, but in the case of a continuous rolling mill using two or more rolling mills 1a, 1b, 1c... as shown in FIG. Detection of biting/unbiting signals of the rolling mill 1a is carried out as described above using the rolled material detector 10 installed immediately before the rolling mill 1a, and
Detection of the biting/release signal in b is carried out using the above-mentioned biting signal of the rolling mill 1a instead of the rolling material detector 10, and detection of the biting/release signal of the rolling mill 1c is performed in the same manner. This can be done using the biting signal of the rolling mill 1b.

In addition, in the case of a reversible rolling mill, as shown in FIG.
0a and 10b, the signal from the detector 10a is used when rolling from the entry side to the exit side, and the signal from the detector 10b is used when rolling from the exit side to the entry side. It is possible to detect the biting and releasing signals.

In the one shown in FIG. 7, the rolled material detector 10
Entry side table 1 of rolling mill 1 without using a
The normal rotation start signal of 3a is used as a rolled material detection signal (a signal indicating the presence of rolled material) that is input to the storage device 11a explained in FIG. Memorize the signal
This stored signal is continued to be output, a signal for setting the storage device 5 is obtained by the subtracter 12a and the comparator 4a, and a signal indicating that biting is in progress is outputted to the terminal 6. Then, after a certain period of time has elapsed since the normal rotation start signal, a signal similar to that at which the rolled material detection signal detects the absence of rolled material is supplied to the storage device 11b, and this signal is The rolling reaction force signal when supplied is stored in the memory device 11b and outputted, and a signal for resetting the memory device 5 is obtained by the subtracter 12b and the comparator 4b, and the rolling reaction force signal supplied to the terminal 6 is The end of the medium signal may also be determined. Further, when rolling the rolled material 2 from the exit side to the entry side, the rolling material detection signal from the above-mentioned rolled material detector 10b is replaced with the rolling material detection signal from the exit side table 13 of the rolling mill 1.
The reverse rotation start signal b may also be used.

Rolled material detector 10 described in FIG. 4 above
is installed far away from the rolling mill 1, the movement of the rolled material 2 between the rolled material detector 10 and the rolling mill 1 is tracked, and the tip of the rolled material 2 is located far away from the rolling mill 1. The timing at which the rolling material reaches the vicinity can be inputted into the storage device 11a as a rolled material detection signal (signal indicating that a rolled material is present), and this can be used as the storage timing. In addition, various control signals can be used as the storage timing of the storage devices 11a and 11b without necessarily installing the rolled material detector 10, such as by using the roll spacing setting completion signal of the rolling mill 1 as the storage timing of the storage device 11a. Good too.

In the above embodiment, a signal directly detected by the rolling reaction force detection device 3 is used as the rolling reaction force signal.
For example, in the case of a rolling mill equipped with a hydraulic rolling device, other signals such as the cylinder pressure signal may be used.

Further, in the above embodiment, a constant value is used as the comparison detection level of the comparators 4a and 4b, but this comparison detection level may be set or changed from the outside.

As described above, the present invention detects jamming based on the change difference in the rolling reaction force signal or a signal equivalent thereto before and after the rolled material is bitten in the rolling mill, and also before the rolled material is bitten in the rolling mill. Since the configuration is configured to perform the release detection with the same change difference after release and after release, a detection device for a rolling mill with high detection accuracy and stable detection operation can be obtained.

[Brief explanation of the drawing]

1, 2, and 3 are block diagrams showing conventional examples, FIG. 4 is a block diagram showing an embodiment of the present invention, FIG. 5 is a diagram showing the operation of the one shown in FIG. 4, and FIGS. FIG. 7 is a block diagram showing another embodiment of the present invention. 1, 1a, 1b, 1c: rolling mill, 2: rolled material,
3: Rolling reaction force detection device, 10: Rolled material detector, 1
1a: first storage device, 11b: second storage device, 12a, 12b: subtractor.

Claims (1)

[Claims] 1. In a jamming detection device that detects whether a rolled material is bitten or released by a rolling reaction force signal or a signal equivalent to this in a rolling mill, the tip of the rolled material approaches the vicinity of the rolling mill. (i.e., the rolled material is about to be bitten), and the tail end of the rolled material approaches the vicinity of the rolling mill after the rolled material has been bitten by the rolling mill. a device that detects a second timing indicating that the rolled material is about to be released (that is, that the rolled material is about to be released); and a device that outputs the input rolling reaction force signal or a signal equivalent thereto as it is before the first timing. On the other hand, a first storage device stores the inputted rolling reaction force signal or a signal equivalent thereto at the first timing and outputs the stored signal from then until the second timing; , before the second timing, the input rolling reaction force signal or a signal equivalent thereto is output as is, while at the second timing, the input rolling reaction force signal or a signal equivalent thereto is outputted as is; and a second storage device that outputs the stored signal from then until the next first timing occurs, and stores the rolling reaction force signal or a signal equivalent thereto and the first storage device. Biting is detected when the difference with the signal stored in the device exceeds a predetermined value, and the difference between the rolling reaction force signal or a signal equivalent thereto and the signal stored in the second storage device is detected. 1. A device for detecting biting in a rolling mill, characterized in that release of biting is detected when the amount of biting becomes less than a predetermined value.