JPS649088B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a coiler for winding a strip into a coil, which is capable of tracking the tip position of the strip with high reliability and high precision after the strip is taken into the pinch rolls. This invention relates to a tracking device for the tip position.

As is well known, the down coiler, which is known as a type of this type of coiler, is as shown in Figure 1.
The strip 1 transferred on a run-out table (not shown) is taken in by pinch rolls 2a and 2b and guided to the outer periphery of the mandrel 3.
On the outer periphery of this mandrel 3, a wrapper roll 4a~
4d, it is rolled up while being pressed. In this case, the strip 1 that has begun to be wound around the mandrel 3 has a height corresponding to the thickness of the strip 1 at the boundary between the first and second turns (or the nth and n+1th turns). step (first
A portion indicated by reference numeral 5 in the figure) is formed. Therefore, the wrapper rolls 4a to 4d
If the above-mentioned stepped portion 5 is kept pressed all the time,
Since the strip 1 repeatedly collides with the wrapper rolls 4a, 4b, 4c, and 4d in sequence, the problem arises that the wound strip 1 is repeatedly scratched. Furthermore, if such a collision occurs, the wrapper rolls 4a, 4b, 4c, and 4d will jump up and the winding of the strip 1 will become loose, making it impossible to fasten the winding, resulting in poor winding shape, surface scratches, or netting. The problem arises.

In order to solve the above problem, it is necessary to accurately grasp (track) the tip position of the stepped portion 5, that is, the strip 1, and adjust the tip position immediately before it passes directly under each wrapper roll 4a, 4b, 4c, 4d. Control may be performed such that the wrapper roll is lifted a predetermined distance from the surface of the strip 1, and the pressing is continued again immediately after passing directly below the same.

However, to perform such control,
It is necessary to track the position of the tip with high reliability and accuracy in a bad environment where there are many vibrations and a large amount of water vapor is generated.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a strip tip position tracking device that can track the tip position of a strip with high reliability and accuracy after the point when the strip is taken into a pinch roll in a coiler.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a block diagram showing a case where the configuration of an embodiment of the present invention is applied to a down coiler. Note that this block diagram shows, as an example, the case where the point in time when the tip end position of the strip 1 reaches the position of the second wrapper roll 4b is detected.

Hereinafter, in this figure, the pinch roll 2b on the lower side of the down coiler 6 in this embodiment is provided with an accelerometer 7 (first detector) for detecting impact on its supporting part, and the strip 1 is connected to the pinch roll 2b. The point at which the object is taken into the rolls 2a, 2b is detected using the impact generated at that time. Further, a pulse generator 8 (rotation detector) is provided on the shaft of the lower pinch roll 2b, which generates a pulse signal (pulse train) with a number of pulses corresponding to the amount of rotation of the pinch roll 2b. In this case, the pinch roll 2b rotates at a peripheral speed slightly faster than the feed speed of strip 1 before taking in strip 1, but after taking in strip 1, it rotates at a peripheral speed equal to the feed speed of strip 1. Therefore, by counting the output pulse signals of the pulse generator 8, the amount of movement of the strip 1 can be determined. In addition, the strip passage 9 on the downstream side of the pinch rolls 2a, 2b
A laser light emitting source 10a (e.g., a laser diode) and a light receiving element 10b (e.g., a phototransistor) are disposed facing each other across the strip path 9, along the strip path 9, and at a distance l from the pinch rolls 2a, 2b. Laser type detector 10
(second detector) is provided, thereby making it possible to reliably detect that the tip position of the strip 1 has passed a predetermined position on the downstream side by a distance l from the pinch rolls 2a and 2b. .

Next, in the control circuit surrounded by the dashed line 11,
The signal output from the accelerometer 7 is sent to the terminal 12.
The signal is supplied to one input terminal A of the comparator 13 via. Further, the other input terminal B of the comparator B is supplied with the detection setting value set by the setting device 14. The comparator 13 outputs and holds a "1" signal if the signal at the input terminal A is larger than the signal at the input terminal B, that is, if an impact greater than the detection setting value is applied to the pinch roll 2b.
On the other hand, the pulse signal output from the pulse generator 8 is supplied to the second input terminal of the AND gate 17 via the terminal 16. In addition, the signal outputted by the laser detector 10, that is, the light receiving element 10
A signal that becomes "1" when light is blocked by the strip 1 is supplied to one input terminal of the AND gate 19 via the terminal 18, and is also supplied to the abnormality detection circuit 20 (means for diagnosing the detection operation). ). This abnormality detection circuit 20 is connected to the strip 1
This is to diagnose whether there is any abnormality in the operation of the laser detector 10 before it is taken into the pinch rolls 2a, 2b, and if the laser detector 10 is normal, it outputs a "1" signal. and gate 1
9 to the other input terminal. Further, in this control circuit 11, those indicated by reference numerals 21 to 24 are setting devices, respectively. In this case, the setting device 21 is a setting device that sets a value corresponding to the distance l between the pinch rolls 2a, 2b and the laser detector 10, and the setting device 22 is a setting device that sets a value corresponding to the distance l between the pinch rolls 2a, 2b and the laser detector 10, and a setting device 22 that sets a value corresponding to the measurement tolerance Δl of the distance l. The setting device 23 is a setting device for setting a corresponding value, and the setting device 23 is a setting device for setting a value corresponding to the strip path length LS1 between the pinch rolls 2a, 2b and the second wrapper roll 4b.The setting device 24 is a laser detection device. vessel 10
This is a setting device for setting a value corresponding to the strip path length LS2 between the strip path length LS2 and the second wrapper roll 4b.

In the following explanation, strip 1 is pinch roll 2.
The process of being taken in by a and 2b and wound around the mandrel 3 will be explained.

First, strip 1 is pinch roll 2a, 2b
Since the accelerometer 7 detects an impact, the comparator 13 starts outputting a "1" signal. This "1" signal is supplied to the first input terminal of the AND gate 17, the reset input terminal R of the up counter 25 (counting means), and the control input terminal S1 of the selector 26, respectively. In this case, the up counter 25 is initialized (cleared to zero) by the rising edge of the "1" signal. Further, when the "1" signal is supplied, the selector 26 selects the value supplied to the data input terminal D1, that is, the value corresponding to the distance LS1, and presets it in the down counter 27 at the rising edge of the signal. On the other hand, since the signal at the third input terminal of the AND gate 17 is a "1" signal (because at this time, the output terminal M of the comparator 28, which will be described later, is a "0" signal), the up counter 25 and the down counter counter 2
A pulse signal equal to the output pulse signal of the pulse generator 8 begins to be supplied to both clock input terminals CLK of 7. Therefore, up counter 25
The down counter 27 adds and counts the same pulse signal from the value "0", while the down counter 27 calculates the distance of the same pulse signal.
Subtract and count from the value corresponding to LS1. and,
The count output of the up counter 25 is sent to the comparator 2.
8, and in this comparator 28, the value supplied to the input terminal B (that is, the value corresponding to the tolerance Δl) is set as the tolerance value, and the value is supplied to the input terminal C. (i.e., the value corresponding to distance l). In this case, the comparator 28 outputs a "1" signal from the output terminal M if the output of the up counter 25 is greater than l + Δl, and outputs a "1" signal from the output terminal L if it is smaller than l - Δl. and l+△l and l
-Δl, that is, within the allowable range, neither of the output terminals M and L outputs a "1" signal.

The following explanation is based on the following explanations: (a) if the point at which the strip 1 is taken into the pinch rolls 2a, 2b is accurately detected by the accelerometer 7, (b) when the strip 1 is actually taken into the pinch rolls 2a, 2b. (c) Strip 1 If the strip 1 is detected as being taken in before it is actually taken into the pinch rolls 2a, 2b (for example, the accelerometer 7 detects an excessive impact before the strip 1 is taken into the pinch rolls 2a, 2b). We will explain the following three types of cases:

Case (a): In this case, when the laser detector 10 detects the tip of the strip 1, the count output of the up counter 25 becomes equal to the value corresponding to the distance l, so at this point, the comparison The signals output from the output terminals M and L of the device 28 are as follows.
Both are "0" signals. Therefore, even if the output of the AND gate 19 becomes a "1" signal at this point, the AND gate 29 will not open. Also, from this point on, the output of the inverter 30 becomes a "0" signal, so even if the signal at the output terminal M of the comparator 28 later changes to a "1" signal, the output signal of the NAND gate 31 becomes a "1" signal. It will remain as it is. Thus,
The AND gate 17 continues to output a pulse signal equal to the output pulse signal of the pulse generator 8, and the down counter 27 continues to subtract this pulse signal. Then, when the tip of the strip 1 reaches the position of the second wrapper roll 4b, that is, the tip of the strip 1 reaches the position of the pinch rolls 2a, 2
When the distance LS1 is advanced from b, the count content of the down counter 27 becomes "0". Therefore, a "1" signal is output from the terminal 32 connected to the borrow output terminal B of the down counter 27 when the tip position reaches the wrapper roll 4b.

Case (b): In this case, when the laser detector 10 detects the tip of the strip 1, the count output of the up counter 25 becomes smaller than the value corresponding to the distance l-Δl. Therefore, in this case, the AND gate 29 is opened at the above-mentioned point, and "1" is output.
A signal is supplied to the control input terminal S2 of the selector 26. Then, the selector 26 changes the value of the data input terminal D2 by the rise of this "1" signal.
That is, a value corresponding to the distance LS2 is set in the down counter 27. On the other hand, in this case, as in the case (a) above, the AND gate 17 continues to output the pulse signal, so the tip position of the strip 1 advances from the position of the laser detector 10 to the position of the second wrapper roll 4b. At this point, the down counter 2
7 becomes "0", thereby detecting that the tip position has reached the position of the second wrapper roll 4b.

Case (c): In this case, the count output of the up counter 25 becomes larger than the value corresponding to the distance l+Δl before the laser detector 10 detects the tip of the strip 1. Therefore, in this case, the signal at the output terminal M of the comparator 28 becomes a "1" signal from this point on, and since the output of the inverter 30 is a "1" signal at this point, the AND gate 17 is closed. As a result, the counting operations of the up counter 25 and down counter 27 are both temporarily stopped. At this time, the count content of the down counter 27 is the value for distance LS2 (more precisely, the value corresponding to LS1-l-△l)
It is becoming. Next, when the tip of the strip 1 is detected by the laser detector 10, the AND gate 17 starts outputting a pulse signal again, and when the tip of the strip 1 reaches the position of the second wrapper roll 4b, the The count content of the counter 27 becomes "0".

As described above, according to the embodiment shown in FIG. 2, the point at which tracking of the tip position of the strip 1 starts is determined by first detecting the point at which the strip 1 is taken in by the accelerometer 7, and this detection is correct. It is possible to check at the time of detection by the laser detector 10 whether the detection is correct or not, and if the detection is incorrect, the detection time by the laser detector 10 can be corrected to the tracking start time. Further, the laser detector 10 itself is diagnosed as to whether or not the detection operation is being performed correctly. Therefore, according to this embodiment, strip 1 due to the detection error at the start of tracking
Tracking errors in the position of the tip can be almost completely eliminated, and even if either the accelerometer 7 or the laser detector 10 fails, the other can be used to perform the tracking operation. It is possible.

In the embodiment described above, the point in time when the tip end position of the strip 1 reaches the position of the second wrapper roll 4b is detected, but the point in time when the tip end position of the strip 1 reaches each position of the other wrapper rolls 4a, 4c, and 4d is detected. In the case of detection as well, a control circuit having the same configuration as in the above embodiment may be provided.

As is clear from the above description, according to the device for tracking the tip position of a strip in a coiler according to the present invention, the first detector detects that the strip is taken into the pinch roll, and the first detector detects that the strip is taken into the pinch roll. A second detector detects that the strip has passed a predetermined downstream position, and calculates the amount of strip movement between each detection point by these two detectors by counting the number of rotations of the pinch roll, and It is determined whether the detection time point by the first detector is correct by comparing the amount and the physical distance, and if it is determined to be correct, the detection time point by the first detector is determined, and if it is incorrect. If it is determined, the tip position of the strip is tracked based on the amount of rotation of the pinch roll from the time of detection by the second detector, so only one of the first and second detectors is provided. This makes it possible to track the tip of the strip with much higher reliability and accuracy than in such a case or in a case where two detectors are simply provided.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a down coiler, and FIG. 2 is a block diagram showing the configuration of an embodiment in which the present invention is applied to a down coiler. 1... Strip, 2a, 2b... Pinch roll, 3... Mandrel, 4a to 4d... Rapper roll, 6... Coiler (down coiler), 7...
First detector (accelerometer), 8... Rotation detector (pulse generator), 10... Second detector (laser type detector), 20... Means for diagnosing detection operation (abnormality detection circuit) ), 25... counting means (up counter), 27... down counter, 28... comparator.

Claims (1)

[Claims] 1. A first detector that detects that the conveyed strip is taken into a pinch roll, a rotation detector that detects rotation of the pinch roll as a pulse signal, and a tip of the strip. a second detector for detecting that the strip has passed a predetermined location on the strip path downstream of the pinch roll;
a counting means for counting the detection output of the rotation detector from the time of detection by the first detector to the time of detection by the second detector; and a strip path length between the pinch roll and the predetermined location. and a comparison means for comparing the value corresponding to the count output of the counting means within a predetermined tolerance range, and if the comparison result of the comparison means is within the tolerance range, detection by the first detector is provided. The tip position of the strip is recognized based on the counted value of the detection output of the rotation detector after the point in time, and if the comparison result is outside the tolerance range, the rotation is detected by the second detector after the point in time. 1. A tracking device for a strip tip position in a coiler, characterized in that the strip tip position is recognized based on a count value of a detection output of the coiler. 2. A device for tracking the tip end position of a strip in a coiler according to claim 1, further comprising means for diagnosing the detection operation of the second detector before the strip is taken into the pinch roll. .