JPH04178502A - Hole bend detection device - Google Patents

Abstract

PURPOSE:To detect a hole bend with high precision by a method wherein a hole bend detecting device comprises three parts of a sensor part, a front run ning part, and a rear running part, and by bendably interconnecting the three parts through universal joints, the device is always positioned at the center of a line when it is run through the line. CONSTITUTION:When a body 1 is advanced through a line 9 with the aid of a winch (not shown) through an advancing wire 6, the body 1 is moved straight in a state that rollers 12 of a sensor part 2 are brought into contact with an inner wall 9a and wheels 5 are moved in a rolling state over the inner wall 9a. When, with this state, the body 1 is moved to the bent part (not shown) of a line 9, even when a force by which the sensor part is displaced from the central line of the line 9 is exerted on the sensor part 2, universal joints 10 and 11 are bent, the sensor part 2 itself is maintained at the center of the line 9. As a result, the bend of the line 9 can be faithfully detected by the sensor part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a hole bending detection device, and in particular, the main body is divided into three parts: a sensor part, a front running part, and a rear running part, and the sensor part is always connected to a pipe. This invention relates to new improvements to prevent the center line of roads from shifting.

b. Conventional technology There are various types of hole bending detection devices that have been used in the past, but here are some representative ones:
One example is the configuration shown in FIG. 5, which was manufactured in-house by the applicant.

That is, what is indicated by reference numeral 1 in FIG. 5 is a main body in the shape of a longitudinal bar, and this main body 1 includes a sensor section 2 for detecting bending in the azimuth and longitudinal direction using a gyro and an accelerometer (not shown), and It is composed of a front running section 3 and a rear running section 4 provided in front and behind the sensor section 2, and wheels 5 are rotatably provided on the front running section 3 and the rear running section 4. There is.

A hook portion 7 for connecting a forward wire 6 is formed in the front running portion 3, and a retraction wire 8 is connected to the rear running portion 4.

Therefore, with the above-described configuration, when the advancement wire 6 is moved forward,
The main body 1 moves forward via each wheel 5, and the sensor section 2 detects the orientation and bending state in the pipe line 9, so that the bending state of the pipe line 9 can be detected.

C8 Problems to be Solved by the Invention Since the conventional hole bending detection device was configured as described above, the following problems existed.

In other words, since the sensor section and each running section are integrally constructed, the center line of the sensor section and the center line of the conduit do not match at the curved portion of the conduit, resulting in a misalignment angle.
It has not always been possible to accurately detect bends in the pipe.

However, the direction in which the forward wire is pulled in the forward direction at the sensor section is not on the center line of the conduit, but has a certain angle according to the bend of the conduit, and the sensor section is able to detect the force in the forward direction. , and receives a component force with a direction of 90",
This component force caused a misalignment between the center line of the sensor section and the center line of the conduit, causing the sensor section to have a certain inclination within the conduit.

If this inclination is an inclination in the azimuth direction, in addition to the curvature in the azimuth direction of the pipe itself, the bend due to this inclination must be measured at the same time, resulting in increased measurement errors and If the sensor section was tilted in the longitudinal direction, the measurement error in the longitudinal direction would increase, as in the case of the above-mentioned orientation.

The present invention has been made to solve the above-mentioned problems.In particular, the main body is divided into three parts: a sensor section, a front running section, and a rear running section, and the sensor section is always located away from the center line of the pipe. It is an object of the present invention to provide a hole bending detection device that prevents deviation.

81 Means for Solving the Problems The hole bend detection device according to the present invention has a main body having a sensor section for detecting at least the direction in the pipe, which runs within the pipe via wheels, and In the hole bending detection device for detecting the bending of a hole, a front traveling part connected to the front of the sensor part via a first universal joint part and having the wheels, and a second universal joint part behind the sensor part. This configuration includes a rear running section connected through a section and having the wheels.

More specifically, a plurality of rollers are provided on a first outer peripheral part and a second outer peripheral part formed at both ends of the sensor part, and each of the rollers is in contact with an inner wall of the conduit. .

82 Effect In the hole bending detection device according to the present invention, the main body is divided into three parts: a sensor part, a front running part, and a rear running part, and these parts are connected in a bendable manner through a universal joint part. Therefore, when the main body is moved inside the pipe, the sensor part can always be located at the center of the pipe, and the rollers provided at both ends of the sensor part come into contact with the inner wall of the pipe, and the sensor part is placed in the center of the pipe. The center line and the center line of the conduit can be matched.

Therefore, even if a force is applied to the sensor section at a bend in the conduit that causes it to deviate from the center line of the conduit, each flexible joint section will bend and the sensor itself will be maintained at the center of the conduit. can accurately detect bends in pipes.

f. Embodiments Hereinafter, preferred embodiments of the hole bending detection device according to the present invention will be described in detail with reference to the drawings.

Note that the same or equivalent parts as in the conventional example will be described using the same reference numerals.

Figures 1 to 4 are for showing the hole bending detection device according to the present invention, with Figure 1 being a side view showing the overall configuration, and Figure 2 being an enlarged side view showing the main parts of Figure 1. , FIG. 3 is a cross-sectional view taken along the line A--A in FIG. 2, and FIG. 4 is a cross-sectional view taken along the line B--B in FIG. 2.

What is indicated by the reference numeral 1 in the figure is a main body in the shape of a longitudinal bar, and this main body 1 includes a sensor section 2 for detecting bending in the azimuth and longitudinal direction using a gyro and an accelerometer (not shown), and a sensor section 2 for detecting bending in the azimuth and longitudinal direction. It is composed of a front running section 3 and a rear running section 4 provided at the front and rear, and wheels 5 are rotatably provided on the front running section 3 and the rear running section 4.

A hook portion 7 for connecting a forward wire 6 is formed in the front running portion 3, and a retraction wire 8 is connected to the rear running portion 4.

A first universal joint part 10 is provided between the front running part 3 and the sensor part 2, and the front running part 3 and the sensor part 2 are connected in a bendable manner.
and the sensor section 2 are bendably connected by a second universal joint section 11 having the same configuration as the first universal joint section 10.

A plurality of rollers 12 are rotatably provided on a first outer peripheral part 2a and a second outer peripheral part 2b formed at both ends of the sensor part 2 via shaft supports 13 along the radial direction of the sensor part 2. ing.

The first shaft joint part 10 is configured as shown in FIGS. 2 and 4, and has a first outer peripheral part 2a of the sensor part 2.
A holding shaft 14a is fixed via a pin 14b to the holding hole 15 of the pair of protrusions 14 formed integrally with the holding shaft 14a. Due to the combination of holes 16a, this annular joint body 16 is configured to be able to rotate in the direction of arrow X.

The pair of second joint holes 16b of the annular joint body 16 have a protrusion 3b formed to protrude from the end 3a of the running section 3.
A holding shaft 17b fixed via a pin 17a is combined with the annular joint body 16, so that the annular joint body 16 can also rotate in the direction of arrow Y.

In addition, since the second universal joint part 11 has the same structure as described above, illustration thereof is omitted.

A first bellows portion 18 is provided between the first outer peripheral portion 2a and the end portion 3a of the sensor portion 2 so as to cover the first universal joint portion 10, and the second universal joint portion 11 is provided with a first bellows portion 18 so as to cover the first universal joint portion 10. This second universal joint part 11 is covered by one second bellows part.

As shown in FIG. 3, each of the rollers 12 consists of eight rollers in total, among which the four rollers 12 located at the top have pivot supports 13 with the horizontal axis 20 in FIG.
is urged outward by the spring member 21, and as a result, there is no gap between the inner wall 9a of the upper half of the pipe 9 and the outer periphery 2c of the sensor section 2, and the horizontal axis 20 in FIG. Each roller 12, which has a shaft support 13 fixedly provided at a lower portion thereof, is biased against the inner wall 9a of the conduit 9.

The hole bend detection device according to the present invention is configured as described above, and its operation will be explained below.

First, when the main body 1 is advanced in the conduit 9 by a winch (not shown) via the advance wire 6, each roller 12 of the sensor section 2 is in contact with the inner wall 9a, and the wheels 5 are rotated on the inner wall 9a. In this state, the main body 1 moves straight.

In the above-mentioned state, when the main body 1 moves to a bent part (not shown) where the conduit 9 is bent, the conduit 9 is connected to the sensor section 2.
Even if a force is applied that causes the joint to deviate from the center line of
As a result, the sensor section 2 can accurately detect the bend in the pipe line 9.

It should be noted that each of the flexible joints 10.11 shown in this embodiment is shown in -example, and even if other well-known structures are used,
It goes without saying that the same effects as described above can be obtained.

g1 Effects of the Invention Since the hole bending detection device according to the present invention is configured as described above, it is possible to obtain the following effects.

In other words, the main body is composed of three parts: the sensor part, the front running part, and the rear running part, and these parts are bendably connected via the universal joint, so the main body can be moved inside the pipe. In this case, the sensor section can always be located at the center of the conduit, the center line of the sensor section and the center line of the conduit can be made to coincide, and hole bending can always be detected with high precision.

[Brief explanation of the drawing]

1 to 47 are for showing the hole bending detection device according to the present invention, FIG. 1 is a side view showing the overall configuration, FIG. 2 is an enlarged side view showing the main parts of FIG. 1, 3 is a sectional view taken along the line AA in FIG. 2, FIG. 4 is a sectional view taken along the line BB in FIG. 2, and FIG. 5 is a side view showing a conventional hole bending detection device. 1 is the main body, 2 is the sensor section, 2a is the first outer circumference, 2b is the second outer circumference, 3 is the front running section, 4 is the rear running section, 5 is the wheel, 9 is the pipe, 9a is the inner wall, 10 is the first universal joint, 1
1 is a second universal joint, and 12 is a roller. Figure 1 Figure 2

Claims (2)

[Claims] (1) A main body (1) having a sensor section (2) for detecting at least the orientation in the pipe (9) is made to travel within the pipe (9) via wheels (5), and In a hole bending detection device configured to detect a bend in a road (9), a first flexible joint part (10) is provided in front of the sensor part (2).
a front running section (
3); and a rear running section (4) connected to the rear of the sensor section (2) via a second universal joint section (11) and having the wheels (5). Detection device. (2) A plurality of rollers (12) are provided on a first outer circumferential portion (2a) and a second outer circumferential portion (2b) formed at both ends of the sensor portion (2), and each roller (12) is provided with a plurality of rollers (12). The hole bending detection device according to claim 1, wherein the hole bending detection device is in contact with an inner wall (9a) of the pipe line (9).