JPH10332344A - Measuring method for inside and outside diameters of strip coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the measurement of the inside and outside diameters of a strip coil. SOLUTION: Light is radiated from a reflection type photoelectric sensor 13 fixed to the reel drum 11 of a winding out machine toward the end face of a strip coil 3, while the strip coil 3 is raised and lowered, and the inside and outside diameters of the strip coil 3 are computed from the height of the strip coil 3 at the time when the state where a reflection type photoelectric sensor 13 receives the light reflected only by the end face of the strip coil switches to/from state where the sensor does not receive said light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for measuring the inner and outer diameters of a strip coil.

[0002]

2. Description of the Related Art A thin metal plate rolled in an ironworks is wound into a coil to form a strip coil. The strip coil is mounted on a reel drum of an unwinder in the next step for forming into a steel pipe or the like. The secondary processing is performed while feeding the metal plate from the output machine.

[0003] The inner diameter of the strip coil is of a type such as φ508, φ610, φ762 mm or the like depending on the standard, and is mounted on a reel drum of an unwinder via a rubber sleeve. In addition, in order to mount the strip coil on the reel drum, the strip coil is mounted on a lifting platform to control the elevation height, so it is necessary to measure the outer diameter of the strip coil, and the outer diameter is a value related to line control. It is also important.

For this reason, the measurement of the outer diameter and the inner diameter of the strip coil is performed. The outer diameter of the strip coil is measured as shown in FIG. That is, while providing a photoelectric sensor including a light projector 1 and a light receiver 2, the lifting platform 4 on which the strip coil 3 is mounted is moved up and down, and a section in the height direction which is shielded from light by the strip coil 3 is detected by the encoder. , The outer diameter of the strip 3 is obtained.

On the other hand, the inner diameter of the strip coil is measured as shown in FIG. That is, by providing a pair of light projectors 7a and 8a on one of a pair of arms 6 rotatable about the rotation shaft 5 and providing a pair of light receivers 7b and 8b on the other, a photoelectric sensor 7 for φ508 and a φ610 are provided. A photoelectric sensor 8 is provided to detect the inner diameter of the strip coil 3 based on whether or not light emitted from the light emitters 7a, 8a can be received by the light receivers 7b, 8b.

[0006]

However, not only must separate means be used for measuring the outer diameter and inner diameter of the strip coil, but also the arm must be raised and lowered when measuring the inner diameter. Control devices such as solenoid valves and sensors are required.

Accordingly, an object of the present invention is to provide a method of measuring the inner and outer diameters of a strip coil which has solved the above problems.

[0008]

According to a first aspect of the present invention, there is provided a method for measuring the inner and outer diameters of a strip coil, wherein the strip coil is disposed along a straight line in a direction perpendicular to the axis of the strip coil. When light is emitted from the fixed reflective photoelectric sensor to the end face of the strip coil while moving along a straight line that bisects the area of the end face of the strip coil, the reflected light is reflected by the reflective photoelectric sensor. The inner and outer diameters of the strip coil are measured by measuring the distance that the strip coil has moved while the sensor is receiving light and the distance that it has moved from the state of receiving light until the light is shielded again. Features.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

FIG. 1 shows the configuration of a method for measuring the inner and outer diameters of a strip coil according to the present invention. As shown in the figure, an elevator 12 is provided near the reel drum 11 of the unwinder. After the elevator 12 is raised, the elevator 12 is moved to the left. The strip coil 3 can be mounted on the reel drum 11. A reflective photoelectric sensor 13 is fixed on the reel drum 11. The reflection type photoelectric sensor 13 is installed such that when the strip coil 3 is moved up and down, the irradiated light moves along a straight line that bisects the area of the end face of the strip coil 3.

When the strip coil 3 is at a low position as shown in FIG. 1A, the light from the reflection type photoelectric sensor 13 irradiates the outer peripheral surface of the strip coil 3, so that there is no reflected light and the reflection type photoelectric sensor 13 has no reflection light. The sensor 13 does not detect light.

When the strip coil 3 is raised to the height shown in FIG. 1B, light is applied to the end face of the strip coil 3, and this light is reflected, and the reflective photoelectric sensor 13 detects the light. .

When the strip coil 3 is raised to the height shown in FIG. 1C, light enters the inside of the strip coil 3 and there is no reflected light, and the reflective photoelectric sensor 13 does not detect light.

When the strip coil 3 is raised to the height shown in FIG. 1D, the reflection type photoelectric sensor 13 detects light as in the case of FIG. 1B.

As described above, the reflection type photoelectric sensor 13 receives light only when the end face of the strip coil 3 is irradiated with light. Therefore, when the strip coil 3 is raised, the light is received from the light receiving state. If the difference between the height of the strip coil 3 when the light is no longer received and the height of the strip coil 3 when light is received from a state where no light is received is obtained, this value is the inner diameter d of the strip coil 3.

Also, the height of the strip coil 3 when the light is not received as shown in FIG. 1A and the light is received as shown in FIG. 1B, and the light is received as shown in FIG. If the difference from the height of the strip coil 3 in a state where light is no longer received as shown in FIG. 1C is obtained, this value is the winding thickness t of the strip coil 3 in the radial direction.

Accordingly, as can be seen from the drawing of FIG. 1 (a), if the outer diameter of the strip coil 3 is D, then D =
Since it is expressed as d + 2t, the value of D can be obtained. Here, the height of the strip coil 3 can be obtained by an encoder.

In this embodiment, the reflection type photoelectric sensor is fixed on the reel drum and the strip coil is mounted on the elevating table to move up and down. However, the present invention is not limited to this configuration. While the strip coil is moved in a horizontal direction along a straight line to measure the inner and outer diameters of the strip coil.

[0019]

As can be seen from the above description, claim 1
According to the method for measuring the inner and outer diameters of a strip coil according to the present invention, the reflection type photoelectric sensor, the means for moving the strip coil, and the detecting means for detecting the amount of movement need only be provided. Therefore, it is not necessary to use two different configurations, that is, a configuration for detecting the outer diameter dimension and a configuration for detecting the outer diameter dimension, which is simplified. In particular, when an unwinder is used, only the reflection type photoelectric sensor and encoder need be prepared, and the cost for measuring the dimensions of the strip coil can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram for explaining a method of measuring the inner and outer diameters of a strip coil according to the present invention.

FIG. 2 is an explanatory diagram for explaining a conventional method for measuring the inner and outer diameters of a strip coil.

[Explanation of symbols]

 3 ... Strip coil 12 ... Elevating table 13 ... Reflection type photoelectric sensor

Claims (1)

[Claims] 1. While moving a strip coil along a straight line in a direction perpendicular to the axis of the strip coil,
When light is irradiated from the fixed reflective photoelectric sensor to the end face of the strip coil and light is irradiated along a straight line that bisects the area of the end face of the strip coil, the reflected light is received by the reflective photoelectric sensor. A strip coil characterized in that the inner and outer diameters of the strip coil are measured by measuring the distance that the strip coil has moved and the distance that the light has traveled from when light was received until light was again received after being shielded from light. Inner and outer diameter measurement method.