JPH0228439Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The present invention uses an inspection device to inspect the entire circumference of the surface of a standing pipe such as a vertical pipe of a large heat exchanger. This invention relates to a rotating device for rotating a circular tube in the circumferential direction.

<Prior Art> As a conventional rotating device for automating work in the circumferential direction, the one shown in FIG. 4 is known.

This conventional type has a casing 2 surrounding an erected circular pipe 1. The casing 2 is suspended from a lifting device (not shown) via a connecting means 3. This casing 2 cannot rotate relative to the circular tube 1. An internal gear 4 is carved on the inner surface of the casing 2. Furthermore, a ring groove 5 is formed on the inner surface of the casing 2.

A rotating ring 6 surrounding the circular tube 1 is fitted into the ring groove 5 so as to be relatively rotatable. A drive motor 7 is fixed to the rotating ring 6. A pinion 8 of the drive motor 7 meshes with the internal gear 4 of the casing 2.

An inspection device, etc. (not shown) is supported on this rotating ring 6 via a suspension means 9.

According to the conventional rotating device described above, the rotating ring 6 rotates around the circular tube 1 through the rotation of the drive motor 7 and the meshing of the pinion 8 and the internal gear 4. Thus, the inspection device and the like connected to the rotating ring 6 rotate in the circumferential direction of the circular tube 1.

Along with the rotation of the rotating ring 6, the drive motor 7 also rotates around the circular tube 1.

<Problems to be solved by the invention> According to the above-mentioned conventional rotating device, since the drive motor also rotates around the circular pipe, it cannot be used in vertical pipes of heat exchangers installed vertically in narrow pitches. For example, there was a problem that the drive motor hit the adjacent pipe, which placed restrictions on the conditions of use.

In other words, when performing work in the circumferential direction (for example, welding work, inspection work, etc.) on each of a plurality of circular pipes, whether or not it can be rotated 360° depends on the gap size between the pipes. This was a problem and the scope of work was becoming narrower.

<Means for solving the problem> In order to solve the above problems, the present invention takes the following measures.

In a rotating device that rotates a rotated body provided on the outer peripheral area of an erected circular pipe around the circular pipe, the rotating device includes a ring-shaped body that surrounds the circular pipe so as to be immovable relative to the circular pipe. It has a casing and a ring gear that is relatively rotatably fitted into the casing and surrounds a circular pipe, and a driving means is fixed to the casing,
A pinion gear of the driving means meshes with the ring gear, and a rotated body is detachably fixed to the ring gear.

<Operation> According to the present invention, when the pinion is rotated by the driving means, the ring gear is rotated. This rotation of the ring gear causes the rotated body to rotate around the circular tube. When the ring gear rotates, the drive means is provided on the casing side, so it does not rotate around the circular tube.

<Example> Hereinafter, an example of the present invention will be described in detail based on the drawings.

In FIGS. 1 and 2, reference numeral 10 indicates a vertical pipe of a large-sized heat exchanger, which is illustrated as a standing circular pipe, and the pipe 10 is joined by welding 11.

12 is a self-propelled lifting device, and a vertical pipe 10
The pipe 10 is held onto the surface of the pipe 10 via a gripping means 13, and is moved up and down on the pipe 10 by rotation of a crawler 14.

Reference numeral 15 denotes a rotating device, which is connected and fixed to the lifting device 12 via a connecting means 16.

Reference numeral 17 denotes an inspection device which is a body to be rotated, and is suspended from the rotating device 15 via a suspension means 18 . This inspection device 17 can inspect the entire surface of the pipe 10 by rotating the rotating device 15 around the pipe and moving the lifting device 12 up and down.

The rotating device 15 according to the present invention includes a pipe 10
It has a ring-shaped casing 19 surrounding it.
This casing 19 is divided into two parts on its diameter line, one side is connected via a hinge 20, and the other side is connected via a hook 21 and a locking tool 22 so as to be openable and closable. A connecting piece 2 is provided on the upper surface of the casing 19.
3 is fixed. This connecting piece 23 and the connecting rod 24 of the lifting device 12 are removably connected to constitute the connecting means 16. The casing 19 is suspended from the lifting device 12 via the connecting means 16, so that it cannot rotate relative to the pipe 10.

The casing 19 has a motor 25 as a driving means.
is fixed. The motor 25 has an output shaft 26 via a reducer, and the output shaft 26 has a pinion gear 2
7 is fixed.

A ring groove 28 is formed in the inner peripheral surface of the casing 19. A notch 29 communicating with the outside is provided in a part of the outer circumference of the ring groove 28.
The pinion 27 projects into this notch 29 .

A ring gear 30 is fitted into the ring groove 28 of the casing 19 so as to be relatively rotatable. This ring gear 30 also surrounds the pipe 10 and is divided into two along its diameter line. Each divided piece of the gear 30 is detachably connected and fixed by a claw 31 and a bolt 32. A gear 30a that meshes with the pinion gear 27 is provided on the outer peripheral surface of the ring gear 30. A radial roller 33 is provided in the middle of the ring gear 30 in the width direction so as to be freely rotatable.
The ring gear 30 is fitted into the ring groove 28 of the casing 19 via a radial roller 33 so as to be relatively rotatable. A step 34 is formed on the inner surface of the ring groove 28, into which the boss of the ring gear 30 is fitted, thereby preventing the ring gear 30 from shifting in the circumferential direction.

A hanging means 18 is detachably fixed to the lower surface of the ring gear 30. An inspection device 17 is fixed to the lower part of this suspension means 18.

The inspection device 17 has a frame 35, and the frame 35 is divided into three sections in the vertical direction and the horizontal direction,
Mirrors 36, 36, 36 are attached to the divided portions at predetermined inclination angles. An industrial television camera 37 is attached to the top of this frame 35.

According to the embodiment of the present invention, as shown in FIG. 2, the divided pieces of the ring gear 30 are brought close to each other from both sides of the pipe 10 so as to narrow the pipe.
The bolt 32 and the claw 31 are connected and fixed. Thus, the ring gear 30 surrounding the pipe 10 is completed.

Next, the engagement between the hook 21 of the casing 19 and the locking tool 22 is released, the casing 19 is opened, and the ring gear 30 is fitted into the ring groove 28. Thereafter, the casing 19 is closed, the hook 21 and the locking tool 22 are engaged, and the connecting piece 23 and the connecting rod 24 are then connected, thereby completing the setting of the rotating device 15.

By turning on the motor 25, the pinion gear 27 and the ring gear 30a are engaged, and the ring gear 30 is turned on.
rotates. This rotation of the ring gear 30 causes the inspection device 17 to rotate around the pipe 10.

As shown in FIG. 3, this inspection device 17 observes the surface of the pipe 10 using three stages of mirrors 36, 36, and 36 in the vertical direction, so it is smaller than one that observes with a single mirror. The device can inspect a wide range of surfaces.

According to the embodiment of the present invention, since the motor 25 does not rotate around the pipe 10, the casing 1
As long as the pipe gap is large enough to accommodate the inspection device 17, this device can rotate the inspection device 17 through 360 degrees.

Further, since the step portion 34 is formed in the ring groove 28, the circumferential vibration of the ring gear 30 is prevented.
In addition, since the inspection device 17 and the like are attached to each divided piece of the ring gear 30, the pipe 10
The inspection device 17 can be appropriately arranged depending on the gap between the two.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be used not only for inspection and maintenance of large heat exchangers in oil refining plants, etc., but also as an automatic welding copying device for round pipe materials.

<Effects of the invention> According to the invention, since the driving means does not rotate around the circular tube, rotation is possible even if the gap between the circular tubes is small.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a rotating device showing an embodiment of the present invention, Fig. 2 is an exploded plan view of the same, Fig. 3 is a side view of an inspection device, and Fig. 4 is a sectional view of a rotating device showing a conventional example. be. 10... Circular tube (pipe), 15... Rotating device,
17...Rotated body (inspection device), 19...Casing, 25...Driving means (motor), 30...Ring gear.

Claims (1)

[Scope of utility model registration request] In a rotating device for rotating a rotated body provided on the outer peripheral area of an erected circular pipe around the circular pipe, the rotating device 15 is a ring that surrounds the circular pipe so as to be immovable relative to the circular pipe 10. a ring gear 30 that is relatively rotatably fitted into the casing 19 and surrounds the circular tube 10; a driving means 25 is fixed to the casing 19;
The pinion gear 27 of No. 5 meshes with the ring gear 30, and the rotated body 17 is connected to the ring gear 30.
A rotating device characterized by being detachably fixed.