JPH10227628A - Coil tip detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically detect the tip part of a hot-rolled or cold-rolled coil being subjected to band-cut treatment accurately and to save power and improve a working efficiency by arranging a tip detector between a cradle roll and a coil ovener. SOLUTION: For example, a coil tip detector 18 such as a laser displacement meter is installed between a cradle roll 6 and a coil ovener 4. Then, a coil 7 is placed on a roll so that a tip part 7a of the steel plate coil 7 is located near the upper part of an upper guide table 4a on the coil ovener 4, the roll 6 is inverted when the upper guide table 4a lightly touches the coil 7, and the coil tip part 7a is rotated in the direction of the roll 6 (counterclockwise) from the upper guide table 4a. While the roll 6 is being rotated, a distance between the surface of the coil 7 and a tip detector 18 is measured, the measurement data are filtered by an amplifier and is outputted as a tip detection signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting the tip of a coil for achieving automatic entry-side handling of a continuous processing line for cold-rolled steel sheets and a hot-rolled steel sheet, a finishing line, and the like.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIG. The coil that has been band-cut on the off-line entry-side saddle 1 is loaded on a coil car 2 and inserted into a pay-off reel 3, rewinded for appropriate processing, and continuously fed. Usually, before inserting the coil into the payoff reel 3,
In order to adjust the shape of the coil tip and facilitate threading in the line, the coil opener 4, crop shear 5, cradle roll 6, etc., which are installed off-line, are used to crop-cut the defective shape of the coil tip. In some cases, the tip of the coil is bent in a nose.

When performing such a tip processing,
In the conventional technique, the coil is transported to the cradle roll 6 offline, and a human visually checks the coil on the cradle roll, and manually reverses the roll (clockwise in the drawing) to move the coil tip as shown in FIG. A person confirms that 7a has passed the upper guide table 4a of the coil opener 4 and has reached a position in front of the cradle roll 6,
The rotation of the cradle roll 6 is stopped. After temporarily stopping the coil at that position, the cradle roll 6 is rotated forward (counterclockwise in the figure) to feed the coil 7 in the direction of the crop shear 5, to perform a crop cut at a defective tip portion, or to perform a coil opener 4 operation. Or to perform coil nose bending.

[0004]

However, as in the prior art, a human detects the tip of the coil visually, stops the cradle roll, and then manually cuts the crop.
If the nose bending process is performed, an operator in charge of the work will be attached to the entrance side of the line, or the line operation operator will also be in charge of the entrance side, and productivity due to increase in line personnel and decrease in mill rotation rate will be Leads to a decline.

[0005] In addition, the work time required for stopping and positioning the coil tip on the cradle roll varies depending on the work level of the operator, and the work efficiency is reduced. For this reason, it has been desired to automate the work of processing the coil end on the input side.However, since there has been no appropriate tip detection technology in the past, the coil end must be detected visually, and as a result, the work on the input side coil end processing must be performed. Was an obstacle to automation.

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and a hot-rolled steel sheet capable of automatically detecting a coil tip at an optimum position, thereby saving labor and improving work efficiency. It is an object of the present invention to provide a method for detecting a coil tip in a process line of a cold rolled steel sheet, a plated steel sheet, or the like.

[0007]

SUMMARY OF THE INVENTION The present invention provides a hot rolled steel sheet, a cold rolled steel sheet, and a plated steel sheet as follows. (1) A tip detector is placed between the cradle roll on which the coil is placed and the coil opener in the steel sheet coil process line, and the coil tip of the band-cut hot-rolled or cold-rolled coil on the cradle roll is automatically adjusted. A coil tip detection method, comprising: detecting a coil tip. (2) The detection method according to the above (1), wherein the tip detector uses a laser beam or the like to detect the tip in a non-contact manner.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the overall arrangement of a tip detector according to the present invention, and FIG. 2 shows the system configuration. A cradle roll 6, a coil opener 4, and a crop shear 5 for performing coil tip processing are installed in the off-line on the line entry side in the same manner as in the related art. The coil 7 loaded on the cradle roll 6 feeds the tip 7a in the direction of the crop shear by the normal rotation of the roll 6, and scrapes or nose-bends a defective portion at the tip of the coil.

In the present invention, the steel plate is made up of a cradle roll 6 and
A coil tip detector 8 is provided between the coil openers 4 which serve as guide plates when threading the crop shears 5. The coil tip detector 8 is composed of, for example, a laser displacement meter, and is set at a position where a laser beam used for tip detection is applied to the coil 7 between the upper guide table 4 a of the coil opener 4 and the cradle roll 6. I do. It is preferable that the tip detectors 8 are arranged at a plurality of positions (three positions in the drawing) in the axial direction of the coil 7.

As described above, the distance between the coil surface and the displacement meter is measured using the laser displacement meter, and the tip of the coil is detected from the detected distance information. FIG. 2 shows a system outline of the tip detector 8. The signals of the displacement amounts output from the laser displacement meters 8A to 8C are taken into the amplifier 9, and a discontinuous point of the displacement amount is detected by signal processing in the amplifier, and the detection signal is used as a tip detection signal.

The method will be described below with reference to FIG. The coil is loaded on the cradle roll 6 at a position where the tip 7a of the coil 7 comes near the upper guide table 4a (in the direction of 3 to 4 o'clock of the timepiece). When the upper guide table 4a of the coil opener 4 touches the coil 7 lightly, the cradle roll 6 is reversed and the coil tip 7a is rotated from the upper guide table 4a in the cradle roll direction.

The distance between the coil surface and the laser displacement meter is measured by using the laser beam irradiating the coil surface during the rotation of the cradle roll 6, and the measured data is filtered by an amplifier. The measured distance draws a distance displacement curve as shown in FIG. 3, where the solid line in FIG. 3 indicates the case where the coil tip is in close contact with the coil surface, and the dotted line indicates the case where the coil tip is not wound around the coil surface. Is shown. When the non-tip portion of the coil 7 hits the laser, the amount of displacement changes continuously. However, when the tip portion of the coil passes through the laser irradiation portion, the displacement becomes thinner by the plate thickness. A discontinuity 10 results. In addition, even if the coil tip is not wound around the coil surface and the tip hangs down, the distance between the laser displacement meter and the coil surface changes discontinuously when the tip passes through the laser irradiation part. A continuous point 10 'results. The discontinuous point of this displacement curve is detected by filter processing with the amplifier,
A signal is output to the upper sequencer as a tip detection signal,
It is used as a command signal for the next tip processing operation.

There are various types of tip shapes of coils to be used in the tip detector according to the present invention. Fish tail shape sent directly from hot rolling process,
In some cases, the tip has already been sheared in the previous step and is straight. For this reason, it is conceivable to install the tip detector so that the measurement position of the tip of the coil is at least one or more, for example, the center part of the coil and the position of 500 mmWS / DS distributed from the center. Can be

In the case of a coil whose tip has already been sheared linearly, it is recognized as tip detection when one or more laser displacement meters output tip detection signals simultaneously. Further, when the coil tip has a fishtail shape, the time when the tip detection signal is output last among a plurality of laser displacement meters is the coil tip detection timing. Immediately after detecting the coil tip at the above timing, the rotation of the cradle roll 6 is stopped, and necessary coil tip processing is performed.

The displacement meter for measuring the distance from the coil surface is not limited to a laser displacement meter, but may be any device capable of detecting the displacement of an object such as an ultrasonic wave.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, near a cradle roll installed for feeding a coil tip to a coil tip scraping crop shear on the steel sheet refining line entry side.
When three tip detectors composed of laser displacement meters were attached, the tip of the coil could be accurately detected. According to the present invention, it is possible to automate the detection of the coil tip on the cradle roll, so that it is possible to automate the cropping operation of the defective portion of the entry side coil tip.

[0017]

As described above, according to the method of the present invention, the detection of the coil tip on the cradle roll can be automatically detected with high accuracy. It has become possible to efficiently and accurately perform coil tip processing on lines, refinement lines, and the like.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an outline of a coil on a cradle roll, a tip detection mechanism thereof, and a tip processing facility for carrying out the method of the present invention.

FIG. 2 is an explanatory diagram showing an example of a system configuration for implementing the method of the present invention.

FIG. 3 is a diagram showing a distance displacement curve between a coil surface and a detector obtained by the method of the present invention.

FIG. 4 is a plan view showing an outline of an off-line entry-side handling facility for a steel sheet coil.

FIG. 5 is a diagram for explaining a conventional coil tip processing operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Entry side saddle 2 Coil car 3 Payoff reel 4 Coil opener 4a Upper guide table of coil opener 5 Crop shear 6 Cradle roll 7 Coil 7a Coil tip 8 Tip detector 9 Amplifier 10 Distance deviation curve between coil surface and detector Continuous point

Claims (2)

[Claims] 1. A tip detector is disposed between a cradle roll on which a coil is mounted and a coil opener in a process line of a steel sheet coil, and a coil end portion of a band-cut hot-rolled or cold-rolled coil on the cradle roll. A coil tip detection method, which automatically detects the position. 2. The detection method according to claim 1, wherein the tip detector is of a type that detects the tip in a non-contact manner using a laser beam or the like.