JPH06339725A - Method for detecting trouble at the time of inserting band steel coil into mandrel or pulling out the same - Google Patents

Abstract

PURPOSE:To surely detect troubles happened at the time of inserting a steel sheet coil into a reel mandrel or pulling out. CONSTITUTION:Making a band steel coil 2 in contact with a mandrel 3 is detected by connecting a conduction detecting circuit 4 providing a power source between the mandrel 3 and the band steel coil 2 and detecting the electric current to flow in the circuit 4. Therefore, it can be detected regardless of the shape or kind of the band steel coil or existence of coating material on the coil 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects troubles that occur when a strip steel coil is inserted into a pay-off reel or when the strip steel coil is removed from a tension reel during rolling, surface treatment, heat treatment, etc. of a strip steel sheet. Regarding the method.

[0002]

2. Description of the Related Art When a strip steel coil is inserted into a pay-off reel or pulled out from a tension reel, a mandrel attached to the reel is inserted into a through hole of the strip steel coil. In such work, in order to prevent the strip steel coil from dropping or deforming like a bamboo shoot, it is necessary to surely insert the reel mandrel into the through hole of the strip steel coil.

Now that full automation of the strip steel processing line has been achieved, it is important that confirmation of insertion and removal of the reel mandrel into and out of the strip steel coil is automatically and surely and promptly performed. is there.

As a conventional means for automatically confirming the insertion and extraction of the mandrel into the through hole of the strip steel coil, as shown in FIG. 3, two photosensors 11 are provided at a predetermined position in front of the coil car 10. , 12 are arranged, and in the process of inserting the coil car 10 into the mandrel 13 at a constant speed, after the passage of the coil 14 is detected by the first photosensor 11, the detection by the second photosensor 12 is recognized within a certain time. There is something to recognize as a trouble when it is not possible.

[0005]

However, in this photosensor detection method, when the coil is removed from the mandrel, a large number of photosensors must be installed because the position to be detected differs depending on the plate width. The detection logic is also complicated. Furthermore, in order to prevent flaws from entering the steel plate, water and oil are often applied to the steel plate,
This is attached to the photo sensor and causes a malfunction, which has a drawback that it is greatly affected by disturbance.

An object of the present invention is to provide an automatic detection means capable of more reliably detecting a trouble that occurs when a steel plate coil is inserted into or taken out of a reel mandrel.

[0007]

A trouble detecting method according to the present invention connects a conduction detecting circuit having a power source between a mandrel and a steel strip coil, and inserts the mandrel into a through hole of the steel strip coil. Alternatively, the contact between the mandrel and the steel strip coil is detected by detecting a current flowing through the detection circuit during extraction.

Further, by detecting the trouble signal, the operation of the conveying means such as the steel coil coil car carrying the steel strip coil or the conveyor can be stopped to prevent the trouble from occurring.

[0009]

The main troubles such as the falling of the steel strip coil or the deformation of the steel strip coil when the mandrel is inserted into or removed from the steel strip coil are caused by the contact of the mandrel with the steel strip coil. In the present invention, the contact between the mandrel and the strip steel coil that causes such troubles is detected by detecting the electrical energization state, and thus the shape and type of the strip steel coil and the presence or absence of a coating material on the strip steel coil It becomes possible to detect it regardless of.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram for carrying out the method of the present invention.

In the figure, 1 is a coil car running on a rail (not shown), 2 is a steel strip coil mounted on the coil car 1, and a through hole 2a is formed at the center of the steel strip coil 2. . Reference numeral 3 denotes a mandrel having a diameter slightly smaller than that of the through hole 2a. The mandrel 3 is inserted into the through hole 2 when the strip steel coil 2 is removed from the payoff reel or inserted into the tension reel. This mandrel 3 and strip steel coil 2
Are connected by a continuity detection circuit 4 including a power source 4a, a current meter 4b and an electric resistance 4c, and a voltage is applied between the coil car 1 and the mandrel 3 by the power source 4a. Further, the continuity detection circuit 4 is interlocked with the coil car 1, and when the detection circuit 4 detects a trouble, the coil car 1 stops.

FIG. 2 is a block diagram for explaining the detection situation of occurrence of trouble.

Referring to FIGS. 1 and 2, the state of FIG.
The mandrel 3 and the steel strip coil 2 do not come into contact with each other and show a normal state.

In this case, no current flows in the detection circuit 4,
The coil car 1 advances as it is, and the through hole 2a of the coil 2
The mandrel 3 is attached to the.

When the center positions of the strip steel coil 2 and the mandrel 3 are deviated and the tip of the mandrel 3 contacts the strip steel coil 2, the conduction detecting circuit 4, the mandrel 3 and the strip steel coil 2 form a closed circuit. It is configured and becomes conductive. This current is detected by the current meter 4b of the electric detection circuit 4, and the contact between the tip end of the mandrel 3 and the steel strip coil 2, that is, the occurrence of trouble is detected. Further, in conjunction with this, the progress of the coil car 1 equipped with the steel strip coil 2 is stopped. As a result, troubles such as dropping and deformation of the steel strip coil 2 are prevented.

As described above, the trouble detecting method at the time of inserting or withdrawing the steel strip coil according to this embodiment detects the contact between the mandrel and the steel strip coil, which causes the trouble, by detecting the electrical energization state. It can be detected regardless of the shape of the steel strip coil and the presence or absence of a coating on the coil.

[0017]

According to the present invention, the following effects can be obtained.

(1) Since the occurrence of trouble is detected in an electrically energized state, the structure is simpler than in the case where a conventional photo sensor is used, and it is resistant to disturbances such as water and oil applied to the coil. , Less malfunctions.

(2) Since the contact state between the inner surface of the coil and the mandrel can be continuously monitored, the occurrence of trouble due to the contact between the mandrel and the coil can be reliably detected.

[Brief description of drawings]

FIG. 1 is an explanatory diagram for carrying out a trouble detection method of the present invention.

FIG. 2 is a block diagram for explaining a method of detecting a trouble occurrence.

FIG. 3 is an explanatory diagram of a conventional trouble detection method.

[Explanation of symbols]

 1 Coil Car 2 Steel Band Coil 2a Through Hole 3 Mandrel 4 Energization Detection Circuit 4a Power Supply 4b Current Meter 4c Electric Resistance

Claims (1)

[Claims] 1. A method for detecting a trouble caused by contact of a mandrel with a strip steel coil when the mandrel is inserted into or removed from a through hole of the strip steel coil, wherein a power supply is provided between the mandrel and the strip steel coil. By connecting the conduction detection circuit, when inserting or removing the mandrel into the through hole of the strip coil, by detecting the current flowing in the detection circuit, to detect the contact between the mandrel and the strip coil, Trouble detection method when inserting or removing mandrel from strip steel coil.