JPH0769270B2 - Towed pipe inner surface inspection device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for inspecting the inner surface of pipelines such as gas and water pipes. More specifically, the invention relates to an apparatus for inspecting an inner surface of a pipe while a TV camera is towed by a tow truck system. The present invention relates to a device for displaying an image and performing an inspection.

Conventional technology and its problems Internal inspections of pipelines such as gas and water pipes are generally observed using image projection equipment such as TV cameras. There is a trolley system, and the traction trolley system is generally carried out by inserting an inspection device connected with a guide big into a pipe and towing the device by motive power such as a winch.

This tow truck type pipe inner surface inspection device has guide pigs (21) (22) before and after an inspection device (generally called a work pig) (20) such as a TV camera as shown in an example of FIG. By pulling the towing rope (23) connected to the leading guide pig (21), the work pig (20) is pulled through the guide pig while observing the inner surface of the pipe. It is composed of a leading guide pig, a work pig, and a rear guide pig.

In the conventional device that uses a TV camera to project an image of the subject on the inside of the tube using a tow truck system, the TV camera is installed in the casing, and it is possible to observe it while towing it with a rope or the like through a guide pig connected to the casing. Since the TV camera is a fixed type, in the case of complicated piping such as a curved pipe, it is not possible to shoot the inner subject sufficiently with the TV camera, and when moving inside the pipe, there is the effect of vibration due to foreign substances and obstacles. There are some problems such as the case where the subject is easily received and the inner subject cannot be clearly observed, and the inner surface of the tube is damaged.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the related art, improves a guide pig, and mounts a television camera for photographing a subject on the inner surface of a tube on a dolly and can swing it so that it can always look forward. It is an object of the present invention to propose a tractor-type pipe inner surface inspection device which can be imaged in a curved pipe portion and can be smoothly moved in the pipe and can be traveled in the pipe without damaging the inner surface.

Configuration of the invention The towed pipe inner surface inspection device according to the present invention comprises a guide car, a television camera car, an electric pig and a rear guide car, and the pipe inner surface is towed by a rope connected to the guide car. A device for photographing a subject with the TV camera and displaying an image, wherein a pair of left and right wheels in which a leading guide wheel and a rear guide wheel are rotatably attached to shaft ends via bearings and the wheels are provided. And a two-wheeled vehicle consisting of a rocking box integrally provided with the TV camera car, and the TV camera car has a structure in which a TV camera is attached to the rocking box part of the two-wheeled car having the same structure as the guide car, facing the leading guide car side. It is characterized in that the leading guide vehicle and the TV camera vehicle are connected by a thin wire at a required interval.

That is, according to the present invention, a television camera for photographing a subject on the inside of the pipe is replaced with a conventional casing fixed type, and is mounted on a two-wheeled type trolley and provided so as to be swingable in the vertical direction, so that the inside of the pipe can be traveled without damage. In addition to making it possible, the TV camera can always see the direction according to the bend of the pipe even in the bend pipe part,
In addition, the guide pig is the same type as the above two-wheeled type so that the passage through the curved pipe part is smooth, and the TV camera car and the leading guide car are connected with a thin wire so that it does not become an obstacle in the optical field of view. It is a feature.

DISCLOSURE BASED ON DRAWING OF THE INVENTION FIG. 1 is a schematic view showing a preferred device configuration of the present invention, and FIG.
The figure is a diagram showing the details of the leading guide vehicle in the same device,
The same figure (a) is a partially broken front view, the same figure (b) is a plan view, FIG. 3 is a figure which shows the detail of the television camera car in the same apparatus, and the same figure (a) is a partially broken front view. The same figure (b) is a side view.

That is, as shown in FIG. 1, the device of the present invention comprises a leading guide vehicle (1), a television camera vehicle (2), an electric pig (3), and a rear guide vehicle (4). 1) and the rear guide wheel (4) are the same, and the electrical equipment pig (3) is a control device such as an image signal amplifier.

The leading guide vehicle (1) has the structure shown in FIG.
A pair of left and right wheels (1-3) are rotatably attached to both ends of the axle (1-1) via bearings (1-2), and the axle is rotated around the wheels (1-1). The swing box (1-4) serving as a dynamic fulcrum is integrally attached to a two-wheeled vehicle structure, and a connecting tool (1-5) of the tow rope (5) is provided on the front end side of the swing box (1-4). ) Is pivotally attached by a pin (1-6), and a connector (1-7) for connecting a television camera car (2) is provided at the rear of the box (1-6).
It is pivotally attached in 8). The tow rope (5) is usually a flat cloth type rope made of cloth such as nylon sling in order to prevent damage to the inner surface of the pipe.

As shown in FIG. 3, the television camera car (1) has bearings (2-) on both ends of the axle (2-1) as in the case of the leading guide car.
A pair of left and right wheels (2-3) are rotatably attached via 2), and the camera mount is integrally attached to this axle (2-1) such that the axle serves as a fulcrum. (2-
4) The television camera (2-5) and the lighting equipment (2-6) are detachably attached to 4). Of course, TV camera (2-
5) and the lighting equipment (2-6) are the guide vehicles ((1)
It is attached to the side. A pair of left and right plate members (2-7) are integrally attached to the axle (2-1) in the tube axis direction, and engaging pins (2-8) (2) are attached to the front and rear ends of the plate members.
-9) is provided laterally to provide a connecting jig.

The leading guide vehicle (1) and the television camera vehicle (2) are connected by a thin wire (6) with a required space. That is, the leading guide wheel (1) side of the thin wire (6) is connected to the connector (1-7), and the engagement pin (2-8) is connected to the television camera vehicle (2) side.
Is locked to. The leading guide vehicle (1) and the television camera vehicle (2) are connected by a thin line so that this connecting line does not become an obstacle in the field of view of the television camera (2-5). Further, the connection interval is also set such that the leading guide vehicle (1) does not hinder the observation of the inner surface of the tube of the television camera (2-5).

The electrical equipment pig (3) has connection jigs (3-1) (3-
An image signal amplifier and the like are built in a cylindrical box having 2). The television camera car (2) and the electric equipment pig (3) are connected by a connecting tool (7), and the electric equipment pig (3) and the rear guide wheel (4) are also connected by a connecting tool (8). .

Action In the above device, the leading guide wheel (1) has the axle (1-
1) Since it has a structure in which the towing rope (5) is connected to a swing box (1-4) which is integrally mounted with the axle so as to be rotatable around the fulcrum, the leading guide vehicle (1) and the towing vehicle (1) are towed. Since the swinging boxes (1-4) connecting the tow ropes in the curved pipe section are tilted in the same direction as the tow ropes (5), they are moved separately from the tow ropes (5).
It facilitates passage through the curved pipe section.

Fig. 4 shows the principle, l ₁ is the length between the axle (1-1) and the tow rope connecting pin (1-6), and l ₂ is the axle (1-1) and the TV camera vehicle. The length between the side connection pins (1-7) is shown respectively. Now, when pulling downward with force F, the traction component force is divided into P1 and the push component component is divided into P2 at point A. On the other hand, at point B, P1 'and P2', respectively
Therefore, a force Fm that is fed forward is generated, which facilitates passage through the curved pipe section.

Here, if l ₁ = l ₂ , then F = Fm, but if l ₁ > l ₂ , then −F <Fm, and the traction force increases, so it is possible to pull with a small F. Become.

The TV camera vehicle (2) connected to the leading guide vehicle (1) by the thin wire (6) has wheels (2-
Since 3) and the TV camera mount (2-4) have different structures, the TV camera (2-5) and the lighting fixture (2-6) always lead the curved pipe section. It will be oriented in the direction of the rope, and it will also be possible to photograph the subject inside the curved tube. Further, the passage through the curved pipe portion is smoothly performed by the same principle as that of the leading guide wheel (1).

EFFECTS OF THE INVENTION As described above, according to the present invention, a television camera for photographing a subject on the inner surface of a pipe is mounted on a two-wheeled vehicle so as to be rotatable around an axle, so that the inner surface of the pipe can be run without damage. In addition, since the TV camera can always look forward even in the curved pipe section, it has an effect of being able to photograph the inner subject of the curved pipe section, and the leading guide vehicle is the same two-wheeled vehicle type as the above, and the towing rope is the fulcrum on the axle. Since it has a structure connected to the swing box,
It also has the effect of running smoothly in a curved pipe section, which makes it possible to easily and accurately capture the subject on the inner surface of complicated piping, which is a great effect on the inner surface inspection of gas, water piping, etc. is there.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a preferred device configuration of the present invention, and FIG.
The figure is a diagram showing the details of the leading guide vehicle in the same device,
The same figure (a) is a partially broken front view, the same figure (b) is a plan view, FIG. 3 is a figure which shows the detail of the television camera car in the same apparatus, and the same figure (a) is a partially broken front view. FIG. 4B is a side view, FIG. 4 is an explanatory view showing a force relationship acting when passing through a curved pipe portion of a leading guide vehicle, and FIG. 5 is a schematic diagram showing a conventional tow truck type pipe inner surface inspection device. is there. 1 ... Leading guide car, 2 ... TV camera car, 3 ... Electrical equipment pig, 4 ... Rear guide car, 5 ... Towing rope, 6 ... Fine wire,
7,8… Connectors.

Front page continuation (72) Inventor Takahide Sakamoto 5-15 Kitahama, Higashi-ku, Osaka City, Osaka Prefecture Sumitomo Metal Industries, Ltd. (72) Inventor Michio Ozawa 5-1-1 Hirano-cho, Higashi-ku, Osaka City Osaka Prefecture (72) Inventor Kaichi Yasui 19-18 Sakurada-cho, Atsuta-ku, Nagoya-shi, Aichi Toho Gas Co., Ltd. (56) Reference Japanese Patent Publication 6-102424 (JP, B2) Japanese Patent Publication 3-49381 ( JP, B2)

Claims (1)

[Claims] 1. A guide guide car, a TV camera car, an electric pig and a rear guide car, and a picture taken by the TV camera of a subject inside the pipe while being pulled and run through a rope or the like connected to the guide car. A towed pipe inner surface inspection device for projecting, in which a leading guide wheel and a rear guide wheel are provided integrally with a pair of left and right wheels rotatably attached to a shaft end via bearings and the axle. The TV camera car is composed of a two-wheeled vehicle composed of an oscillating box, and the TV camera car has a structure in which the TV camera is attached to the axle of the two-wheeled vehicle having the same structure as the guide car, facing the guide car side, and the guide car and the TV camera car are arranged. A tractor-type pipe inner surface inspection device characterized by being configured by connecting with a thin wire at a required interval.