JP2000117326A - Device for automatically stopping tail end of strip coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automate work for rotating a strip coil on cradle rolls and stopping its tail end in an arbitrary position with a device for surely detecting the tail end in spite of the diameter of the coil and automatically stopping it in a prescribed position. SOLUTION: This device for detecting the tail end of the strip coil and for automatically stopping the tail end is constituted of the cradle rolls 2 on which the strip coil 1 is placed and rotated, one noncontact type range finder 3 which is arranged being separated in the direction orthogonally crossed to the width direction of the strip coil 1 to be placed on these cradle rolls 2, detecting part 4 provided with a mechanism for adjusting the measurement axis of the range finder so as to orthogonalize to the center axis of taking-up of the strip coil 1, signal processor 5 for processing distance measuring signals from the range finder 3, controller 6 for executing the operation of tail end stopping position and output of cradle roll stopping command, and cradle roll driving device 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a tail end of a strip coil such as a thin steel plate and stopping the coil at an arbitrary position.

[0002]

2. Description of the Related Art A strip coil bound in a band on the exit side of a hot strip mill is cut in a band on a post-process entrance side, inserted into a pay-off reel, unwound, and discharged to a processing line. At this time, the tail end of the thick or high-strength strip may jump when the band is cut. When the payoff reel is inserted, it is desirable from the viewpoint of operating efficiency that the tail end of the coil is located at a fixed position in the line payout direction. For this reason, in many cases, the band is cut such that the tail end of the coil is stepped on with a cradle roll, and after the band is cut, the coil is rotated to a predetermined position by rotating the cradle roll.

[0003] In this case, the rotation amount of the coil is conventionally determined by a person by monitoring an ITV monitor or the like. However, due to the problem of work efficiency, a method of automatically detecting the coil tail end and automatically controlling the rotation amount has been proposed. Proposed.

As means for automatic detection of the tail end, a method using a contact type sensor and a method using image processing have been proposed. In the former, however, the device becomes large in order to withstand contact with the coil, and the result detection accuracy is increased. However, there is a problem that the reliability is poor and the latter is costly.

In Japanese Patent Publication No. 1-31968, as a means for solving these problems, there is proposed a method in which two distance detectors are scanned in the width direction of the coil to detect the coil tail end with high accuracy. In this method, an actuator for moving the rangefinder up and down from above the coil and scanning it in the width direction is required, which requires a large-scale device. Since the detector must be scanned in the coil width direction each time, it cannot be applied to a place where this processing is required in a short time, such as a pickling line for a metal strip.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and eliminates the need for a human monitoring operation, is low in cost, has high reliability, and can reduce the existing operation pitch. It is an object of the present invention to provide a device for detecting and automatically positioning a tail end of a coil without affecting it.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a cradle roll for mounting and rotating a strip coil, and a strip coil mounted on the cradle roll. A non-contact type distance meter spaced apart in a direction perpendicular to the width direction, and a detection unit having a mechanism for adjusting a measurement axis of the distance meter so as to be orthogonal to a winding center axis of the strip coil; , A device for processing the detection signal, in the course of the operation,
To detect the point where the tail end of the coil passes on the measurement axis of the non-contact type distance meter when the strip coil with the band cut is rotated on the cradle roll. Further, there is provided an automatic tail end stopping device for a strip coil which stops the tail end detected in this way at an arbitrary position regardless of the coil diameter based on coil diameter information given in advance.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of an automatic tail end stopping device for a strip coil according to an embodiment of the present invention. As shown in FIG. 1, the present invention employs a cradle roll 2 for mounting and rotating a strip coil 1, and a strip coil 1 to be mounted on the cradle roll 2 in a direction orthogonal to the width direction of the strip coil 1. A detection unit 4 having one non-contact type distance meter 3 disposed at a distance, a signal processing device 5 for processing an output signal from the detection unit 4, and a control device for calculating a tail end stop position and outputting a cradle roll stop command 6 and a cradle roll drive device 7 to constitute a strip coil tail end detection device and a tail end stop device.

The non-contact type distance meter comprises, for example, an ultrasonic sensor or the like.

The cradle roll 2 is mounted on a coil car 8 for transporting coils, and rotates a motor 10 by a driving device 7 which receives a command from a control device 6, and a rotation amount detector mounted on a rotating shaft thereof. By feeding back the measurement results of No. 11, the rotation direction and the rotation amount are controlled.

The detection unit 4 has an elevation angle θ such that the measurement axis of the non-contact type distance meter 3 is orthogonal to the winding center axis of the strip coil 1 regardless of the outer diameter of the strip coil 1 to be mounted. Is automatically adjusted by the angle adjusting device 9.
As the angle adjusting means, for example, a feedback positioning device such as an AC servomotor is used.

FIG. 2 is a block diagram of a signal processing apparatus according to the embodiment. As shown in detail in FIG. 2, the signal processing device 5 outputs the output signal 2 of the non-contact type distance meter 3 of the detection unit 4.
4 is input, and a tail end detection signal 25 is output from the strip coil initial measurement distance hold circuit 21 when the coil is transferred and the comparison circuit 22.

FIG. 3, FIG. 4 and FIG. 5 are diagrams for explaining the process up to the stop of the coil tail end in the embodiment. The process of detecting the tail end of the strip coil 1 by the above-described embodiment will be described with reference to FIGS.

The band coiled strip coil 1 is placed on its cradle roll 2 with its tail end 3 by a coil car or the like.
3 is transferred to the right side of the cradle roll 2-B and in the fourth quadrant as shown in FIG. 3, and in this state, the band is cut and removed by an automatic band cutting device (not shown).
Thereafter, when inserting the coil into the payoff reel, the coil tail end 31 must be in the second quadrant as shown in FIG.
It is necessary to rotate the cradle rolls 2-A and 2-B to rotate the coil 1 in the direction of arrow 32 in FIG. An apparatus for automatically rotating and stopping the cradle 2-A, 2-B is an embodiment of the present invention.

First, as shown in FIG. 3, at the timing when the coils are transferred and automatic band cutting is started, the initial measurement distance is held by the initial outer diameter holding circuit 21 shown in FIG. At the same time, based on the coil outer diameter data given in advance, the non-contact distance meter 3
The elevation angle θ of the non-contact type distance meter 3 in FIG. 1 is automatically adjusted so that the measurement axis passes through the winding center axis of the strip coil 1.

Thereafter, an automatic tail end positioning flow is started with a signal indicating that the automatic band cutting has been completed.

When the automatic flow starts, the electric motor 10 is driven by the driving device 7 in FIG. 1 to rotate the cradle roll 2. That direction is the direction in which the coil 2 rotates in the direction of 32 in FIG. At the same time, a comparison between the hold value 26 and the instantaneous distance measurement value 24 is started by the comparison circuit 22 in FIG.

Then, when the coil tail end 31 passes through the cradle roll 2-A as shown in FIG. 4, the coil tail end 31 behaves like a little bouncing in the direction of arrow 33 in FIG. The change in the measurement distance of the non-contact type distance meter 3 having the distance measurement axis placed at this position is compared with the comparison circuit 22.
, The tail end can be detected.

As described above, the angle of elevation θ is adjusted by the adjuster 9 so that the measurement detection axis of the non-contact type distance meter 3 passes through the strip coil winding center axis by calculation from the coil outer diameter known in advance. Since the tail end is detected, after the tail end is detected, the tail end can be positioned by adjusting the rotation amount of the cradle roll by θ + α up to the position of the target angle α in FIG.

[0020]

As described above, according to the present invention, the tail end can be reliably detected at a low cost, high reliability, and the tail end can be positioned at an arbitrary position in a series of actual operation of the equipment. ,
There is a great effect that unmanned operation can be realized without reducing operation efficiency.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an automatic tail coil stop device for a strip coil according to an embodiment of the present invention.

FIG. 2 is a block diagram of a signal processing device in the embodiment.

FIG. 3 is a diagram illustrating a process until a coil tail end stops in the embodiment.

FIG. 4 is a diagram illustrating a process up to a stop of a coil tail end in the embodiment.

FIG. 5 is a diagram illustrating a process up to a stop of a coil tail end in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Strip coil 2, 2-A, 2-B cradle roll 3 Non-contact type distance meter 4 Detector 5 Signal processing device 6 Control device 7 Drive device 8 Coil car 9 Sensor angle adjusting device 10 Cradle roll drive motor 11 Rotation amount detector 21 Initial measurement distance hold circuit 22 Comparison circuit 24 Distance measurement signal 25 Tail end detection signal 31 Coil tail end 32 Coil rotation direction 33 Tail end bounce direction

Claims (2)

[Claims] 1. A cradle roll for mounting and rotating a strip coil, and a cradle roll is separated from the cradle roll so that a measurement axis thereof passes through a winding center axis of the strip coil mounted on the cradle roll. A strip coil tail end detection device, comprising: a detection unit provided with one non-contact type distance meter; and a device that processes a detection signal of the detection unit. 2. A cradle roll for mounting and rotating a strip coil, and a cradle roll is separated from the cradle roll so that a measurement axis thereof passes through a winding center axis of the strip coil mounted on the cradle roll. The position of the tail end can be arbitrarily determined based on the detection result of the tail end detection device for the strip coil, which includes a detection unit having one non-contact type distance meter and a device for processing the detection signal of the detection unit. Automatic stop device for the strip coil to automatically stop at the position.