JPH1148027A - Method of controlling speed of side trimmer line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothen the transfer to the speed reduction by detecting the inclination as a degree of curved reduction of a lug cutting width so as to forecast the achievement to the reduction trigger level. SOLUTION: In a displacement curve, inclination (change ratio) is always measured. In this condition, speed reduction control for side trimmer line is started at a time point that a lug cutting width achieves the speed reduction trigger level after (t) seconds (speed reduction control starting point), which is forecasted on the basis of a change of measured change ratio. This speed reduction is performed on the basis of the arrival time from the speed reduction control starting point to an achievement point of the speed reduction trigger level, which is forecasted on the basis of the change ratio of the lug cutting width at the starting point.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line speed control method for a line having a side trimmer for trimming an edge of a strip such as a rolled steel plate.

[0002]

2. Description of the Related Art While running a strip, the width of the strip is constantly fluctuating depending on the rolling conditions when the edges of both side edges are trimmed by, for example, a rotating blade. In the middle of cutting the ear of the band with the rotary blade of the side trimmer, at the place where the width of the band became narrow, the cut-out margin of the ear became narrow and thin, and even if it was torn or trimmed, it was normal The trimming debris is not discharged, and the debris is processed in a spiral manner. In an extreme case, the rotary blade comes off the ear of the band, and when the ear is cut again by the rotary blade, an extremely large impact is given to the rotary blade and the rotary blade is damaged. Trouble also occurs.

In order to solve this problem, Japanese Patent Publication No.
Japanese Patent Application Laid-Open Publication No. H11-157572 discloses a predetermined position in which the edge (ear portion) of the band is located outside the trimming position of the side trimmer in the width direction in response to the output from the band width detecting means and the traveling position detecting means. A belt side trimming device (side trimmer) including control means for reducing the running speed (line speed) of the web by the running drive means at least during the period in which the belt is inward in the width direction. It has been disclosed.

When the margin for cutting off the ears is reduced, the line speed is reduced as described above to ensure the discharge of trimming debris, and the line speed is reduced even when the rotary blade comes off. According to the company, the impact force when cutting is started again can be reduced, and stable trimming is possible.

[0005]

However, it is impossible to instantaneously shift the line speed from the steady speed at which normal trimming is performed to the deceleration speed as described above. And requires some time to transition to a reduced speed. The timing for shifting to the deceleration speed is determined based on whether or not the cut-out margin of the ear portion is equal to or less than a certain value.In setting the deceleration speed trigger level set as this constant value, in order to allow for this shift time, It is necessary to set the level with a margin. Therefore, the cycle time becomes longer, which is an operational problem. In addition, since the trimming margin is set to have a margin, the yield is also reduced.

[0006] The present invention provides an efficient side switch which does not cause any deterioration of the cycle time and the yield by smoothly shifting to the deceleration speed and smoothly returning to the steady speed. The present invention provides a trimmer line speed control method.

[0007]

Means for Solving the Problems Although the position of the ears of the rolled band may fluctuate steeply, the present inventor does not have a stepwise displacement and always has a certain inclination. By paying attention to the curved displacement, it has been found that the arrival at the deceleration speed trigger level can be predicted by detecting the degree to which the edge cut margin decreases in a curve as a slope (rate of change). . By employing the present invention, the setting of the deceleration speed trigger level can be optimized as a value as long as the operation is not hindered. However, if the line speed is returned to the normal speed just after momentarily exceeding the deceleration speed trigger level that is just optimized, the possibility that a trimmer trouble will occur if the speed falls below the deceleration speed trigger level immediately afterwards. Therefore, the high-speed return trigger level for returning to the steady speed is set slightly higher than the deceleration speed trigger level.

That is, the belt-like body normally travels at a certain constant speed, and the ears at both ends are trimmed by side trimmers provided in the middle of the travel route, and the margin of the ears is less than a certain value. In the case of a side trimmer line speed control method in which the vehicle is driven at a reduced speed lower than the steady speed and the ears at both ends are trimmed by the side trimmer, a change rate of a cutting margin of an ear of the band-shaped body is changed. Is measured, and the arrival time until the ear margin value reaches the deceleration speed trigger level that shifts to the deceleration speed is predicted and calculated from the rate of change. The above-mentioned object is attained by a side trimmer line speed control method, wherein the line speed is reduced toward the deceleration speed when the trigger level is reached.

[0009] At this time, after the line speed becomes the deceleration speed, when the ear cut margin actual value exceeds a high-speed return trigger level which is set higher than the deceleration speed trigger level, acceleration is started. Then, the line speed is returned to the normal speed again.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a line to which the method of the present invention is applied, a strip is normally run at a constant steady speed, and ears at both ends are trimmed by side trimmers provided in the middle of a running route. In the case where the ear cut margin is equal to or less than a certain value, the line is run at a deceleration speed lower than the steady speed and the side trimmers trim the ears at both ends. The outline of the side trimmer line speed control of the present invention applied to this line will be described below with reference to FIG.

FIG. 1 (a) shows a time-series change of the ear position measurement value from the ear position measurement means attached to the side trimmer and the actual value of the ear cut margin calculated from the position of the trimmer blade. On the operator side (OP side) and the drive side (DR side). FIG. 1 (b) shows the smaller value of each of the ear cutting margins and shows it by a thick line.
In the present invention, the following control is performed by using the edge cut margin displacement indicated by the thick line. When the deceleration rate of the line speed is constant, the deceleration speed is reached after a predetermined time (t seconds) from the steady speed.
At this time, in a state where the slope (change rate) is continuously measured in the illustrated displacement curve, it is predicted that the trimming margin reaches the deceleration speed trigger level after t seconds from the transition of the measured change rate. The deceleration of the side trimmer line speed control according to the present invention is started from the point of time (shown as a deceleration control start point in the figure). This deceleration is performed on the basis of the arrival time from the start point of the deceleration control start to the point of reaching the deceleration speed trigger level predicted from the ear cut margin change rate at the start point. The estimating of the arrival time is, in the simplest case, the intersection (arrival point) between the deceleration control start point and a straight line obtained from the slope from the start point and the deceleration speed trigger level (set as a straight line parallel to the time axis). The calculation is performed, and the correction according to the deceleration rate is performed.

According to the present invention, the deceleration speed trigger level can be set to a minimum level as an optimum value based on the operating experience up to now.
Next, the high-speed return trigger level for accelerating the line speed and returning to the steady speed is set to a value slightly larger than the deceleration speed trigger level, and when the cutting margin exceeds the high-speed return trigger level, the line is reset. Speed up and return to steady speed.

FIG. 1C shows how the line speed changes corresponding to the above. Here, when the ear position measuring means is independently installed on the upstream side of the side trimmer, the tracking means provided on the line is used, and the ear position measuring means on each side of the ear is used. Focusing on the smaller value of the temporal change of the position, similarly, as a deceleration control start point, the point is tracked as position information, and the deceleration is started when the side trimmer is reached. The method of estimating the time to reach the deceleration trigger level is the same as described above, and a description thereof will be omitted. However, when measuring with the ear position measuring means,
Either mechanical centering of the band or correction of the fluctuation is adopted so that the fluctuation of the band does not disturb the measurement.

[0014] When the edge cut margin is smaller than the aforementioned deceleration speed trigger level, it is desirable to stop the line in order to avoid a line trouble. The line stop trigger level shown in parentheses in FIG. 1B shows an example of the set level in that case, and the dotted line in FIG. 1C shows the case where the ear cut margin falls below this level. The control to stop the line is performed to prevent a serious accident.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the present invention, an example in which an ear position measuring means is provided on a side trimmer will be described. In FIG.
1 shows a schematic view of a side trimmer line to which the present invention is applied, as viewed from above. The strip 1 is conveyed from the top to the bottom of the figure. The side trimmer has its side trimmer housing 7 fixed to the width of the strip after trimming.
A side guide 2 for centering the strip is provided on the entrance side of the side trimmer. The centering control is performed by the cylinder 3 so that the deviation of the ear position measuring device 4 (OP side, DR side) becomes zero. Has been done. The centered strip is trimmed with a side trimmer,
The ear cut margin is actually measured by the side trimmer ear position measuring device. That is, the distance b between the fixed end surface of the side trimmer housing 7 and the end of the band-shaped body 1 is measured by the side trimmer ear position measuring device, and the difference between the end surface and the distance (fixed value) a between the side trimmer blade and the end surface is measured. a-b is the actual ear cut margin. The time-series change is monitored by using the smaller value of the ear cutting margins at the side trimmers on both sides, and the above-described control is performed. Here, in this example, tracking is unnecessary because the ear trim is directly measured by the side trimmer.

On the other hand, an ear position measuring device is provided at a position several tens meters upstream of the side trimmer to measure the position fluctuation of the ear,
The information may be tracked to perform the trimming of the present invention.

[0017]

According to the present invention, it is possible to smoothly perform the deceleration control of the side trimmer line for preventing the trouble of the side trimmer, and it is possible to improve the operation cycle time and the yield.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory diagram of side trimmer line speed control of the present invention.

FIG. 2 is a schematic diagram of a side trimmer line for explaining an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Strip 2 Side guide 3 Cylinder 4 Ear position measuring device 5 Side trimmer ear position measuring device 6 Side trimmer blade 7 Side trimmer housing

Claims (2)

[Claims] 1. A belt-shaped body normally travels at a certain constant speed, and ears at both ends are trimmed by side trimmers provided in the middle of a traveling route, and the margin of the ears is less than a predetermined value. In the case of a side trimmer line speed control method in which the vehicle is driven at a reduced speed lower than the steady speed and the ears at both ends are trimmed by the side trimmer, a change rate of a cutting margin of an ear of the band-shaped body is changed. Measure
The arrival time until the ear margin value reaches the deceleration speed trigger level at which the ear margin margin value shifts to the deceleration speed is predicted from the change rate, and the ear margin margin value matches the deceleration speed trigger level in the prediction calculation. A line trimmer line speed control method comprising: starting deceleration at the time when the line speed is increased toward the deceleration speed. 2. After the line speed reaches the deceleration speed,
2. The system according to claim 1, wherein when the ear cut margin actual value exceeds a high-speed return trigger level set to be larger than the deceleration speed trigger level, acceleration is started, and the line speed is returned to a steady speed again. Side trimmer line speed control method.