JPH0735536A - Device for measuring outer diameter of steel pipe - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a steel pipe outer diameter measuring device that can automatically measure the outer diameter of a steel pipe in a short time with high accuracy and that can clearly determine the deformed state of the pipe. [Structure] The outer diameter measuring device main body is composed of an ampule fixing side and a dimension measuring terminal, and the outer diameter measuring device main body is provided with an upper surface holding guide plate for holding a steel pipe as an object to be measured. The fixed side is fixed as the machine position, the dimension measuring terminal is brought into close contact with the steel pipe, the outer diameter is measured by the moving amount of the digital display dial gauge, and the outer diameter measuring device main body is rotated around the outer circumference of the steel pipe to obtain a plurality of points or more. An outer diameter measuring device for steel pipes whose outer peripheral surface can be measured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pipe outer diameter dimension measuring device.

[0002]

2. Description of the Related Art In recent years, a platform structure capable of withstanding long-term use even under the severe environment associated with the development of deep-sea ocean oil fields is required. TLP (Tension Leg Pl
atform) is adopted. The steel pipe used for this TLP must be constructed by continuously welding in an oil field reaching a water depth of 200 to 2000 m. In this construction, steel pipes are continuously welded and manufactured, but for that purpose, it is necessary to have an accurate measurement method because the steel pipes to be continuously welded have the same diameter. There is. Therefore, as a conventional method for measuring the outer diameter of a steel pipe, a measuring tape, a caliper, a micrometer, or the like is used to measure the outer peripheral length of the steel pipe by hand.

Further, as disclosed in Japanese Patent Laid-Open No. 3-152404, there is known a new method for measuring the outer diameter of a boiler tube or the like, which replaces the conventional calipers. In this outer diameter measuring method, a permanent magnet is fixed, a rotor having a Hall element facing the permanent magnet, and an outer diameter measuring bar biased by a spring in a direction away from the permanent magnet is movably attached. The outer diameter measuring bar of is brought into contact with the outer circumference of a member having a circular outer circumference, and in this state, the rotating body is drawn around a perfect circle to rotate around the member, and the outer diameter of the member is obtained by the electromotive force of the Hall element by the permanent magnet. This is a method for measuring the outer diameter of a member having a circular outer circumference.

[0004]

However, the above-mentioned measuring method using the measuring tape has a problem in that it requires manual measurement and in accuracy. In addition, the measuring method using a caliper or a micrometer has a problem that a general measuring instrument such as a caliper or a micrometer does not know the deformed state of the steel pipe for general people who do not take measurements. Further, Japanese Laid-Open Patent Publication No. 3-152404 discloses a method for measuring the outer diameter of a boiler tube, and therefore, it is only applicable to a tube having a relatively small diameter and the apparatus is complicated. In response to these problems, the object of the present invention is to accurately measure the outer diameter of the steel pipe in a short time, and to determine the deformed state of the pipe clearly. It is to provide a measuring device.

[0005]

SUMMARY OF THE INVENTION The gist of the invention is that an outer diameter measuring device body is composed of an anvil fixed side and a dimension measuring terminal, and the outer diameter measuring device body is held on a steel pipe which is an object to be measured. The upper surface holding guide plate is disposed, the anvil fixing side is fixed as a starting point position, the dimension measuring terminal is brought into close contact with the steel pipe, the outer diameter is measured by the moving amount of the digital display dial gauge, and the outer diameter measuring device main body is provided. It is possible to measure the outer peripheral surface at a plurality of points by rotating the outer peripheral surface of the steel pipe to the outer peripheral surface of the steel pipe.

The present invention will be described in detail below with reference to the drawings. FIG. 1 is an overall view of an outer diameter dimension measuring device according to the present invention. As shown in FIG. 1, both ends of the pipe frame 2 are brought into contact with the outer circumference of the steel pipe 1 from both sides of the anvil fixed side 3 and the dimension measuring terminal side, and the dimension measuring terminal 4 is attached to the dimension measuring terminal side.
And a digital display dial gauge 5,
An upper surface holding guide plate 6 of the steel pipe 1 is arranged at the center of the pipe frame 2.

FIG. 2 is a detailed view of the dimension measuring terminal arranged on the dimension measuring terminal side according to the present invention. As shown in FIG. 2, inside the outer diameter measuring bar body receiving jig 7, the inner shaft sleeve 8,
It is composed of a spring 9, a shaft 10 and a tracing stylus 11, and the shaft 10 is supported by a frame 12. When the tracing stylus pushing piece 13 is pushed in the direction of the arrow, the digital display dial gauge 5 is pushed to the left side, and the shaft 1
0 moves to the left side, the contact point 11 comes into contact with the outer surface of the steel pipe, and the outer diameter at that position is displayed digitally on the dial gauge 5.
The amount of movement is displayed on and the outer diameter is measured.

FIG. 3 is a detailed view of the ampule fixing device arranged on the fixed side according to the present invention. The contact surface of the contactor 14 is circular so as to make a line contact with the steel pipe surface. FIG. 4 is a detailed view of the pipe frame according to the present invention. As shown in FIG. 4, the pipe frame 2 has a shape that surrounds a steel pipe, and has a lightweight and solid structure. FIG. 4B shows the calibration bar gauge 15.

[0009]

Next, the outer diameter gauge calibration operation will be described in detail. First, the dimension between the ampule fixed side and the dimension measurement terminal is set to 1118 mm, for example. Then, the calibration rod gauge 15 is horizontally sandwiched between the fixed side of the ampule and the dimension measuring terminal, and the digimatic indicator is pushed to 0 to display 0.00. After setting the calibration, in measuring the outer diameter of the steel pipe, first, the three measuring positions in the length direction of the steel pipe are measured in the circumferential direction from the weld bead edge, for example, 10 points.
Write at the 0 mm position. Then, write four points at eight divided positions for measuring the outer circumference in the circumferential direction from the writing position. That is, the outer diameter of the steel pipe is measured at 45 ° pitch at four points.

[0010]

[Example] When measuring the outer diameter of a steel pipe, the outer diameter measuring gauge is set at the steel pipe measuring position, and first, a marking line is inserted on the outer surface side at a position 100 mm from the weld bead edge. Set the gauge body on the outer surface of the steel pipe so that the measuring part comes to the position of the writing. The outer diameter of the steel pipe is measured at 45 ° pitch at 4 points. That is, the outside diameter measuring gauge is held by the person who fixed the ampoule and two persons, and the fixed side is slid on the steel pipe surface while the dimension measuring terminal 14
The upper holding guide plate 6 is set so as to be stable on the upper surface of the steel pipe 1 so as not to contact the steel pipe 1. Then, the fixed side of the ampule is brought into close contact with the position of the book and the fixed side presses it. The measurer confirms that the entire length in the longitudinal direction of the steel pipe is in close contact with the steel pipe on the dimension measurement terminal side. Then, the digital indicator display value is read and recorded. For example, the steel pipe diameter is read as the digital indicator display value ± 1118 mm.

When the dimension measuring terminal is returned, the outer diameter measuring gauge is rotated to bring the fixed side of the ampule into close contact with the next 45 ° writing position, and the above operation is repeated. When the measurement of the outer diameters at the four writing positions is repeated and the measurement is completed, the dimension measuring terminal is moved to the next position in the longitudinal direction so as not to contact the steel pipe, and all the writing positions are measured. As a result, it was possible to automatically measure the outer diameter of the steel pipe at a high density in a short time, and it was possible to clearly determine the deformed state of the pipe.

[0012]

As described above, according to the present invention, the outer diameter of a steel pipe can be automatically measured with extremely high precision in a short time, and the deformed state of the pipe can be clearly determined. It is an excellent outer diameter measuring device for steel pipes.

[Brief description of drawings]

FIG. 1 is an overall view of an outer diameter dimension measuring device according to the present invention,

FIG. 2 is a detailed view of the dimension measuring terminal arranged on the dimension measuring terminal side according to the present invention,

FIG. 3 is a detailed view of an ampule fixing device arranged on the fixed side according to the present invention;

FIG. 4 is a detailed view of a pipe frame according to the present invention.

[Explanation of symbols]

 1 Steel Pipe 2 Pipe Frame 3 Anvil Fixed Side 4 Dimension Measuring Terminal 5 Digital Display Dial Gauge 6 Top Holding Guide Plate 7 Jig 8 Internal Shaft Sleeve 9 Spring 10 Shaft 11 Measuring Point 12 Frame 13 Measuring Point Push Piece 14 Contact Point 15 Calibration Bar gauge

Claims (1)

[Claims] 1. An outer diameter measuring device main body is composed of an ampule fixing side and a dimension measuring terminal, and the outer diameter measuring device main body is provided with an upper surface holding guide plate for holding a steel pipe which is an object to be measured, and the ampule fixing part. Side is fixed as a starting point position, the dimension measuring terminal is brought into close contact with the steel pipe, the outer diameter is measured by the moving amount of the digital display dial gauge, and the outer diameter measuring device main body is rotated to the outer circumference of the steel pipe to form an outer peripheral surface at a plurality of points or more. A device for measuring the outer diameter of a steel pipe, which is capable of measuring.