JPH07280545A - Coil outer diameter measuring method - Google Patents

Abstract

PURPOSE:To provide a coil outer diameter measuring method which enables the lessening, of measuring errors in outer diameter dimensions of a coil to eliminate the excessiveness of tensioning or loosening at the time of plate leaping. CONSTITUTION:In this coil outer diameter measuring method, an upper photoelectric tube 3 and a lower photoelectric tube 4 are arranged at a fixed interval below a payoff reel 1 rotatable normally and oppositely having a strip coil 2 inserted thereinto. The payoff reel 1 is turned in the direction of unwinding until a tip part 2a of the coil 2 gets over the lower photoelectric tube 4. At the same time, after the passage of the tip part of the coil, the reel is turned in direction of winding until the tip part passes the upper photoelectric tube 3 from the lower photoelectric tube 4 to measure the outer diameter of the coil from an angle of rotation of a pulse generator 5 at the moment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the outer diameter of a spirally wound strip coil which is inserted into a payoff reel of a continuous processing line for steel and non-ferrous metals.

[0002]

2. Description of the Related Art Conventionally, a strip-shaped coil has been attached to a payoff reel in a continuous processing line for metallic materials. If the outer diameter of the inserted strip-shaped coil is not known, the coil is unwound and unrolled. Since the peripheral speeds of the pay-off reel and the pinch roll do not match and the coil is pulled or loosened too much when passing through the plate, wrinkles occur, so the outer diameter of the coil must be measured before unwinding. It was

As the measuring method, a method of inputting the outer diameter of the coil, which is known from the above process, to a terminal and calculating it by a computer, or a method of measuring the centering height of the coil has been used.

[0004]

However, in the case of the method of inputting to the terminal, the operator may make an input mistake, or the tension of the coil when the coil having the outer diameter dimension known from the above process is processed and wound. The outer diameter of the coil changes depending on the strength, and if you input the value as it is, the peripheral speeds of the pinch roll and payoff reel will not match at the time of opening, and the coil will be pulled too much or loosened too much, causing wrinkles. If wrinkles are formed, there is a problem that the joining position does not match when joining the end of the preceding coil, and various other inconveniences occur.

In the method of measuring the centering height, the tension varies depending on the thickness of the coil such as the coil having a large outer diameter or the coil having a small outer diameter, and the tightening force also varies. In the same manner as described above, the peripheral speeds of the pay-off reel and the pinch roll do not match, and wrinkles easily occur, which hinders the work of the next step.

[0006] The present invention was researched and developed to solve the above-mentioned problems, and reduces the measurement error of the outer diameter of the coil, and measures the outer diameter of the coil to prevent excessive tension and looseness during passing. It is intended to provide a method.

[0007]

As a means for solving the above problems and achieving the object, the present invention has an upper phototube and a lower phototube below a payoff reel that rotates in forward and reverse directions in which a strip-shaped coil is inserted. The payoff reel is rotated in the rewinding direction until the tip of the coil crosses the lower photoelectric tube, and is rotated in the winding direction after passing through the lower photoelectric tube to pass through the upper photoelectric tube. We have developed and adopted a coil outer diameter measuring method that measures the outer diameter of the coil according to the rotation angle of the pulse generator at that time.

[0008]

The payoff reel 1 is rotated in the rewinding direction indicated by arrow B until the tip 2a of the coil 2 inserted into the payoff reel 1 passes over the upper phototube 3 and reaches the lower phototube 4.
After that, when rotating from the lower photoelectric tube 4 to the upper photoelectric tube 3 in the winding direction of arrow B, and the rotation angle of the pulse generator 5 at that time is θ degrees, the relationship between the coil outer diameter D and the angle is

[0009]

[Equation 1] And the outer diameter D of the coil is

[0010]

[Equation 2] The outer diameter D of the coil can be obtained by the following equation. When the coil outer diameter D is obtained, the rotation speeds of the pay-off reel 1 and the pinch roll 6 are determined so that the peripheral speeds thereof are the same.

[0011]

The method for measuring the outer diameter of a coil according to the present invention will be described below. Reference numeral 1 denotes a payoff reel that rotates about a horizontal axis, and the rotation direction is switched between a rewinding direction indicated by arrow a and a winding direction indicated by arrow b by a predetermined switching device. A coil 2 having an appropriate diameter wound in a spiral shape is attached to the payoff reel 1.

Reference numeral 3 denotes an upper phototube, which is composed of a projector 3a installed below one side of the payoff reel 1 and a photoreceiver 3b installed below the other side of the payoff reel 1. Similar to the photoelectric tube 3, it is composed of a light projector 4a and a light receiver 4b. A pulse generator 5 is provided above the payoff reel.

The payoff reel 1 is rotated in the rewinding direction indicated by arrow a so that the tip portion 2a of the coil 2 inserted in the payoff reel 1 is hung down and is rotated until it reaches the lower photoelectric tube 4 beyond the upper photoelectric tube 3. Let After that, the lower photoelectric tube 4
When the rotation angle is θ degrees of the pulse generator 5 at that time, the relationship between the coil outer diameter D and the angle is as follows.

[0014]

[Equation 3] And the outer diameter D of the coil is

[0015]

[Equation 4] The outer diameter D of the coil can be obtained by the following equation. When the coil outer diameter D is obtained, the rotation speeds of the payoff reel 1 and the pinch roll 6 are determined so that the peripheral speeds of the payoff reel 1 and the pinch roll 6 are the same.

[00016]

According to the coil outer diameter measuring method of the present invention,
The payoff reel is rotated in the winding direction until the upper phototube turns off from the lower phototube, and the rotation angle at that time can be easily and accurately determined by the calculation formula to determine the coil outer diameter D. Therefore, as compared with the conventional method, the measurement error of the outer diameter of the coil is reduced, the excessive tension and the excessive looseness at the time of passing the plate are eliminated, and the continuous processing line work can be smoothly performed.

[Brief description of drawings]

FIG. 1 is a side view of a coil outer diameter measuring method of the present invention.

[Explanation of symbols]

 1 Payoff Reel 2 Coil 2a Coil Tip 3 Upper Phototube 4 Lower Phototube 5 Pulse Generator

Claims (1)

[Claims] 1. An upper phototube 3 and a lower phototube 4 below a payoff reel 1 in which a band-shaped coil 2 is inserted and which rotates in a forward and reverse direction.
Are arranged at regular intervals, and the pay-off reel 1 is rotated in the rewinding direction until the tip 2a of the coil 2 crosses the lower photoelectric tube 4, and after passing, it is rotated in the winding direction to rotate the lower photoelectric tube 4 To the upper photoelectric tube 3 until it passes through, and the outer diameter of the coil is measured by the rotation angle of the pulse generator 5 at that time.