JPH0230647B2 - SHIITOPAIRUTSUMEBUNOKAIKOHABASOKUTEIHOHO - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for measuring the opening width of a sheet pile claw, and in particular, a sheet pile claw suitable for measuring the opening width of the claw of a U-shaped sheet pile having Larsen-type claws in a red-hot state. This invention relates to a method for measuring the opening width of a portion.

[Conventional technology]

There are various cross-sectional shapes of sheet piles manufactured at present, and among these, a U-shaped sheet pile 10 in which a ralzen-shaped claw 14 is formed at the tip of a flange 12, as shown in FIGS. 1 and 2, is used. In the U-shaped sheet pile 10, for example, the third
As shown in the figure, since the claws 14 are used in connection with each other, the opening width G of the claws 14, which is shown enlarged in FIG. 2, influences the performance of the connection.
It is one of the most important aspects of quality control.
For this reason, it is desired to measure the claw opening width G over the entire length of the U-shaped sheet pile 10 in a red-hot state immediately after rolling. However, to date, no measuring method or device has been proposed that can satisfy these requirements.Therefore, workers have to cut out a part of the product immediately after rolling, cool it with water to room temperature, and then Place a caliper or the like on the claw part 14 and read the scale to determine the opening width G.
Currently, a method of measuring .

[Problems to be solved by the invention]

However, this manual method by workers has the following major problems. That is, (1) Since a part of the product is cut off, the opening width G of the claw part over the entire length cannot be determined. (2) Yield decreases because part of the product is cut off. (3) Water cooling may result in an opening width that is different from the claw opening width G in the red-hot state, and the reliability of the measured value is low. The present invention has been made in order to solve the above-mentioned problems of the conventional art. The purpose is to provide a width measurement method.

[Means to solve the problem]

As shown in FIG. 4, the present invention measures the opening width G of the claw portion of a sheet pile 10 having a U-shaped cross-section and having a Larsen-type claw 14 with a substantially constant height h of the claw portion at the lateral end. In this case, the sheet pile 10
Using a distance meter 20 disposed in a direction perpendicular to the outer surface 12a of the flange excluding the claw portion, the distance L from the range finder 20 to the outer surface 12a of the flange is detected, and the distance L above the claw portion 14 is detected. an optical position meter disposed at a predetermined height H in view of the opening of the claw, with its optical axis a parallel to the flange outer surface 12a and near the flange-side tip 14a of the claw 14; 22 is used to detect the deviation amount Δl of the flange side tip side 14a of the claw portion 14 from the optical axis a, and detect the detection distance L, the deviation amount Δl, and the optical axes of the distance meter 20 and the optical position meter 22. distance between a l ₀
From this, the opening width G of the claw portion is determined using the following relationship. G=L−(l ₀ −Δl)=L−l ₀ +Δl (1) Here, (l ₀ −Δl) in equation (1) is the difference between the distance meter 20 and the flange side tip of the claw part 14. 14a. The mounting height H of the optical position meter 22 is set at a position sufficiently distant from the claw portion 14 (for example, 1000 mm or more).
shall be. In general, even if the size of a U-shaped sheet pile changes, the height h of the claw part
The difference is only about 10mm at most (for example, 28mm to 38
mm), the mounting height H is determined to match the intermediate value between the minimum dimension sheet pile and the maximum dimension sheet pile, and the optical axis a of the optical position meter 22 is set at the claw portion 14.
By setting it near the flange side tip 14a, there is no large error in the measured value of Δl (Δl=H・tanθ; θ is the angle formed by the line connecting the position meter 22 and the claw tip 14a and the optical axis a). Does not occur. For example, the position meter 22 is installed at H=1000mm above the intermediate value, that is, from the tip of the claw part, Hmax=1000mm+5mm for the sheet pile with the smallest size, and Hmin=1000mm-5mm for the sheet pile with the largest size. , the true value of the deviation amount Δl from the optical axis a of the position meter 22 is 10 mm.
, the theoretical measurement value using the method of the present invention is 10mm x (1000mm ± 5mm) / 1000 = 10mm ± 0.05mm
Therefore, there is no problem. In actual rolling equipment
Since the position meter is installed above about 2000mm, the error becomes even smaller. Further, the distance meter 20 is located slightly above the top surface of the claw portion 14, specifically, 50 mm from the top surface of the roller table.
~70mm above sheet pile flange outer surface 1
Aim for 2a and set it up. By installing the distance meter 20 in this manner, it is possible to accurately measure the claw opening width G even if there is some lateral movement in the sheet pile being conveyed. As the range finder 20, for example, a laser range finder or the like can be used. Further, as the optical position meter 22, for example,
By detecting the difference in radiant energy due to the difference in temperature between the surface temperature of the inner surface 14b of the claw portion 14 and the surface temperature of the flange side tip 14a, the flange side tip 1
A method for determining the position of 4a, a method using a light cutting method, etc. can be used. Furthermore, the calculation of the claw opening width G can be performed using various arithmetic devices such as a microcomputer. The accuracy of the measuring method according to the present invention depends on the accuracy of the components, and can be expected to have a standard deviation σ of about 0.2 mm for a claw opening width G of 15 mm.

【Example】

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a measuring device for carrying out a method for measuring the opening width of a sheet pile claw portion according to the present invention will be described in detail with reference to the drawings. In this embodiment, as shown in FIG.
In a measuring device for measuring the claw opening width G of a U-shaped sheet pile 10 having Larzen-shaped claws 14, a measuring device is provided on the table roller 30 in order to restrict large lateral vibration of the U-shaped sheet pile 10. The outer surface 12a of the flange excluding the guide roller 32 and the claw portion 14 of the sheet pile 10
a distance meter 20 for detecting the distance L to the flange outer surface 12a, which is disposed in a direction perpendicular to the flange outer surface 12a;
is disposed at a predetermined height above the claw portion of the sheet pile 10 looking into the claw opening, and its optical axis a is in a direction parallel to the flange outer surface 12a and in a direction parallel to the flange of the claw portion 14. an optical position meter 22 set near the side tip portion 14a for detecting the amount of deviation Δl of the flange side tip portion 14a of the claw portion 14 from the optical axis a; the distance meter 20; and the optical position meter. 22 in a predetermined position near the U-shaped sheet pile 10, the distance meter 20 and the optical position meter 22 are shielded from a large amount of heat energy due to radiant energy, convection, etc. of the U-shaped sheet pile 10. The pedestal 34 provided with the plate 36, the distance L of the output of the distance meter 20, and the optical position meter 2
An arithmetic device 38 for calculating the claw opening width G from the above-mentioned equation (1) from the deviation amount Δl of the two outputs and the distance l ₀ between the optical axis a of the distance meter 20 and the optical position meter 22.
It is composed of. As the range finder 20, a laser range finder is used. The optical position meter 22, as shown in FIG.
A linear image sensor camera is used which detects the position of the flange side tip 14a based on the difference in output as shown in FIG. 7, for example. The arithmetic unit 38 includes a setting device 38a for setting the distance l ₀ between the optical axes a of the distance meter 20 and the optical position meter 22, as shown in detail in FIG. 5 above;
a subtracter 38a for subtracting the deviation amount Δl determined from the output of the optical position meter ₂₂ from the distance l 0 set by the setter 38a; A subtracter 38c for calculating the claw opening width G by subtracting the calculation result (l-Δl) of the subtractor 38b, and a digital display 38d for digitally displaying the calculation result of the subtractor 38c. It consists of In this embodiment, since a linear image sensor camera is used as the optical position meter 22, it is possible to easily detect the position of the flange-side tip of the claw of the U-shaped sheet pile in a red-hot state. . In the above embodiments, the present invention was applied to measuring the opening width of the claw portion of a U-shaped sheet pile in a red-hot state, but the scope of application of the present invention is not limited to this. It is clear that this method can be similarly applied to measuring the opening width of the claw portion of a sheet pile.

【Effect of the invention】

As explained above, the present invention has the excellent effect of being able to measure the opening width of the claw part of a U-shaped sheet pile having Larsen-shaped claws in a red-hot state over the entire length without contact. .

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the cross-sectional shape of a U-shaped sheet pile with Larsen-type claws to which the present invention is applied, FIG. 2 is an enlarged cross-sectional view of a portion of FIG. 1, and FIG. FIG. 4 is a cross-sectional view showing a state in which the U-shaped sheet pile is used, FIG. 4 is a cross-sectional view showing a state in which the method for measuring the opening width of a sheet pile claw portion according to the present invention is being carried out, and FIG. FIG. 6 is a sectional view, partially including a block diagram, showing the configuration of an embodiment of a measuring device in which the method for measuring the opening width of the sheet pile claw portion is adopted. FIG. 7, which is a cross-sectional view showing the configuration of FIG. 7, is a line diagram showing an example of the image sensor output. DESCRIPTION OF SYMBOLS 10...U-shaped sheet pile, 12a...Flange outer surface, 14...Claw, 14a...Flange side tip, 20...Distance meter, 22...Optical position meter, 38...Arithmetic device.

Claims (1)

[Scope of Claims] 1. When measuring the opening width of a claw portion of a sheet pile having a U-shaped cross-section and having a Larzen-type claw with a substantially constant height at its lateral end, Using a range finder placed in a direction perpendicular to the outer surface of the flange, excluding the distance, detect the distance from the range finder to the outer surface of the flange, and at a predetermined height position above the claw where the opening of the claw is expected. The optical axis of the flange-side tip of the claw is determined by using an optical position meter whose optical axis is parallel to the outer surface of the flange and near the flange-side tip of the claw. A method for measuring the opening width of a sheet pile claw, the method comprising: detecting the amount of deviation from the sheet pile claw, and determining the opening width of the claw from the detected distance, the amount of deviation, and the distance between the optical axes of the distance meter and the optical position meter. Method.