JPH05849Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a boiler tube inspection guide device used for various inspections of boiler tubes arranged vertically or horizontally. Note that the present invention is not limited to this, and can also be applied to tubes (heat exchanger tubes) in heat exchangers of other chemical industrial equipment, plants, etc.

Conventional technology For aging inspection of various plant piping such as boiler tubes, in the preparation stage, for example, removal of fixed ash, etc. is carried out in order to measure the outer diameter and wall pressure, which are indicators of the degree of wear, and to detect flaws such as micro-cracks. The boiler tube surface is cleaned, and at the inspection stage, for example, liquid penetrant testing is performed.

However, at present, almost all of these tasks are performed manually, and there has been little use of labor-saving automation (remoteization) for various inspections, which has been particularly desired in recent years.

Problems to be solved by the invention Taking as an example the conventional work around the boiler tube (evaporation tube) 02 in the boiler furnace 01 as shown in Fig. 4, in this furnace 03 is the front part of the furnace. , 04 is the header at the rear,
Several boiler tubes 02 meandering up and down are suspended from this tube.

Especially in medium and large boilers, the height of the boiler tube is more than 10 meters, and the total length of the tube is several tens of meters.

Manual cleaning and various inspections of the boiler tube 02 have the following problems. In other words, (1) It was necessary to assemble and install large-scale scaffolding, which required a great deal of expense, time, and effort.

(2) Work at heights was highly dangerous for workers.

(3) In any case, the accessibility of workers is poor;
In some cases, it was not possible to perform adequate inspections on areas that were hard to reach.

Means for Solving the Problems In order to solve these conventional problems, the present invention remotely and automatically moves various inspection tools along the axial direction of the boiler tube to the inspection target location of the boiler tube. In an inspection guide device whose movement can be adjusted, a set of U-shaped clamps surrounding the boiler tube are connected via one first air cylinder, and a guide shaft is erected on the first clamp, A second clamp is slidably inserted through the guide shaft, each of these clamps is provided with a pair of claws operated by a second air cylinder and a link mechanism, and the guide abuts on the adjacent boiler tube side. A roller is attached to each of the first clamp and a bracket fixed to the tip of the guide shaft.

Effect According to such a means, a pair of claws operated by the second air cylinder and a link mechanism are attached to each of the first and second clamps provided on the upper and lower sides (or front and back), and the gripping on the boiler tube is performed. In addition to having the
The first air cylinder provided between these clamps intermittently adjusts the movement of each clamp in the vertical (or horizontal) direction, and the guide device itself can be automatically raised and lowered (moved).

Embodiment An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 3.

According to the present invention, as shown in FIGS. 1 and 2, various inspection devices such as a liquid penetrant flaw detector (not shown) are used along the axial direction of the boiler tube 1 to reach the inspection target location of the boiler tube 1. Guide device 2 that can automatically adjust the movement from a remote location.
is provided.

That is, in this guide device, a pair of U-shaped clamps 3 and 4 that surround the boiler tube 1 and are placed on the top and bottom of the boiler tube 1 have a telescopic mechanism.
They are connected via a first air cylinder 5 between them. In this case, the first air cylinder 5 is fixed to the first clamp 3 side, and at least one or more guide shafts 6 are erected on the first clamp 3, and the second clamp 4 is connected to the first air cylinder 5. It is made to be able to slide through the guide shaft.

Further, each of these clamps is provided with a pair of claws 9 at the end thereof which are operated by a link mechanism such as a small second air cylinder 7 and a slide shaft 8.

Each pawl 9 is provided with, for example, a V-shaped groove so as to come into contact with the boiler tube 1.

In addition, 10 in FIG. 1 is a motion arm, and this arm serves as a fulcrum and slides (moves) two slide shafts 8 connected to the ends of each claw 9 via bearings 11. With a link mechanism for each second
The motion arm slides due to the reciprocating movement of the piston of the air cylinder 7.

A substantially I-shaped bracket 1 has a guide roller 13 fixed to the first clamp 3 and the tip of the guide shaft 6, which contacts the adjacent boiler tube 1' side.
4 are attached to each. This guide roller consists of a short shaft portion having a cylindrical central portion and a pair of conical portions sandwiching the short shaft, and is supported by the tube 1 by each portion. The ends of the pair of conical portions are connected to each of the first clamps 3 and the brackets 1.
It is rotatably attached to a groove-shaped roller press 15 extending from the boiler tube 4 toward the adjacent boiler tube 1'.

Note that a means such as a compression spring (not shown) that can be brought into close contact with the adjacent boiler tube 1' may be incorporated into the roller press or guide roller 13.

On the other hand, a carrier 16 which has a U-shape or any other arbitrary shape similar to these clamps and is provided with an inspection tool (not shown) for inspecting around the tube 1
is suspended from the first clamp 3 by coupling with a pin 17 or the like.

Next, its effect will be explained.

However, in the following items, a case will be explained in which the first and second clamps 3 and 4 are moved and adjusted above the boiler tube 1.

(1) First, in the initial state, the first inspection guide device 2, which is initially removed, is placed below the boiler tube 1 to be inspected, preferably within the reach of the operator. The distance between the pair of claws 19 attached to the second clamps 3 and 4 is adjusted by supplying working air to the second air cylinder 7 and contracting the piston 12 of the second air cylinder 7.
By sliding the slide shaft 8 outward using the fulcrum, the inspection guide device 2 is set at the boiler tube 1 position. In this state, the distance between the claws 9 of the first clamp 3 is adjusted to the piston 12 of the second air cylinder 7.
is expanded by working air and the slide shaft 10 is slid inward to close and grip the boiler tube 1. However, at this time, the claw 9 on the second clamp 4 side remains open (the piston 12 of the second air cylinder 7 is contracted).

(2) In this way, the first
First, the clamp 3 is brought into close contact with the target tube 1. At this time, if there is adhered ash or the like on the surface of the tube 1 and the thickness around the tube is uneven, the pair of claws 9 can be moved around the tube 1 using the combination of the second air cylinder 4 and the link mechanism. By crimping the tube axially symmetrically, it is possible to maintain a uniform compressive force and crimping (clamp) it in accordance with the tube surface shape. Furthermore, even if operating air is supplied to the second air cylinder 7 of the second clamp 4 located at the top to close the claw 9, the second air cylinder 7 located at the bottom must be able to adjust the movement in the axial direction of the tube 1. 1 The claw 9 of the clamp 3 should be loosened (opened).

On the other hand, the first air cylinder 5 is kept in a contracted state (its piston) without being supplied with working air.

Simultaneously with these attachments, each guide roller 13 attached to the first clamp 3 and the bracket 14 above it is brought into contact with the adjacent boiler tube 1' side. Each guide roller 13 is in close contact with its tube 1' side, and is supported by its short axis and conical portion, respectively, as described above.

(3) Next, by filling the first air cylinder 5 with working air and extending its piston upward, the second clamp 4 at the top is moved in the direction of the tube 1 axis and along the guide shaft 6. raise. At this time, the guide roller 13 similarly moves upward while being guided by the adjacent tube 1' provided parallel to the tube axis direction, so the second clamp 4 does not twist or tilt to the left or right. , it will expand in one direction while maintaining the positional relationship with the first clamp 3 at the bottom.

(4) Then, like the first clamp 3 at the bottom, the pair of claws 9 on the second clamp 4 at the top are closed by supplying working air to the second air cylinder 7, and this clamp is attached to the tube 1. Let me grasp it.

(5) After that, conversely, the piston 12 of the second air cylinder 7 of the lower first clamp 3 is contracted and the slide shaft 8 is slid outward, so that the claw 9 of the first clamp 3 is moved from the tube 1. Then, loosen (open) this clamp 4 to the extent that the movement can be adjusted slightly.

(6) At the same time, while keeping the upper second clamp 4 at a constant position, the first air cylinder 5 is filled with working air separate from the working air filled at the time of the operation in item 3. By releasing the working fluid and once contracting the air cylinder, the lower first clamp 3 is pulled down along the guide shaft 6.

(7) After this operation is completed, the operation will move on to item 2 again, and these steps 2 to 7 will be repeated in sequence. Therefore, FIG. 3 is a time chart of the order of these steps, and by giving such intermittent movements to the first and second clamps 3 and 4, the transport platform 16 can be moved to the inspection target location of the boiler tube 1. It is possible to reliably move and adjust the inspection tool installed in the In addition, when lowering the clamps 3 and 4 toward the lower part of the boiler tube 1, on the contrary, the above-mentioned items 2 to 7 may be operated according to the reverse procedure (sequence). Even in this case, the upper and lower clamps 3 and 4 are guided in a certain direction by the guide roller 13. Moreover, according to the present invention, similar functions and effects can be obtained not only in vertical pipes but also in horizontal pipes.

Effects of the invention As detailed above, according to the invention, the combination of the second air cylinder and the link mechanism allows the pair of claws to grip while maintaining an even compressive force, and furthermore, the U-shaped first and By connecting the second clamps with a guide shaft and using a single first air cylinder to move up and down (or move) the boiler tube in the vertical (or horizontal) direction, this inspection guide device to the tube can be Can be set easily.

Moreover, especially when the tube is gripped with the claws, the relative position between the center of the tube and the claws is necessarily constant, and no special measures are required to obtain positional accuracy on the side of various inspection devices.

From the above, especially in the case of vertical pipes, if this inspection guide device is installed below the boiler tube, it can be raised and lowered remotely, thus eliminating the need for scaffolding for workers. It is possible to completely eliminate the need for this, and this also makes it possible to reduce costs and shorten the construction period.

Furthermore, dangerous work by workers at high places can be considerably reduced, and safety can therefore be sufficiently ensured.

Moreover, by combining the remote automated inspection device and the inspection guide device of the present invention, it is possible to reach areas that workers cannot reach, such as narrow spaces.
It is possible to carry out the desired inspection easily and accurately.

[Brief explanation of the drawing]

Fig. 1 is a schematic vertical cross-sectional view showing an example of a boiler tube inspection guide device according to the present invention, Fig. 2 is a schematic cross-sectional view thereof, and Fig. 3 is a first and second
FIG. 4 is a diagram showing intermittent movements by the clamp claw and the first air cylinder, and FIG. 4 is a diagram showing an example of inspection points according to the present invention and the conventional method. 1, 1'... Boiler tube, 2... Inspection guide device, 3, 4... Clamp, 5... First air cylinder, 6... Guide shaft, 7... Second air cylinder, 8... Slide Shaft, 9...claw, 13...guide roller, 14...bracket.

Claims (1)

[Scope of utility model registration request] In an inspection guide device that can remotely and automatically move and adjust various inspection tools along the axial direction of the boiler tube to the inspection target location of the boiler tube, a set of U-shaped clamps surrounding the boiler tube is installed. In addition to being connected via one first air cylinder, a guide shaft is provided upright on the first clamp, and a second clamp is made to be able to slide through this guide shaft, and a second air cylinder is attached to each of these clamps. and a link mechanism, and a guide roller that abuts the adjacent boiler tube side is attached to each of the first clamp and a bracket fixed to the tip of the guide shaft, for inspecting a boiler tube. Guide device.