JPH02291961A - Apparatus for inspecting inner surface of tube - Google Patents

Abstract

PURPOSE:To make it possible to inspect the inner surface of a tube body automatically by constituting an apparatus with fixing drums, fixing legs, a lifting mechanism, a rotary drum, a probe arm and a probe. CONSTITUTION:An inspecting device 10 is provided with fixing drums 11 and 12 for fixing the device at the arbitrary position on the central axis in a center pipe 2 which is a tube body. Fixing legs 15 for fixing the device on the central axis of the pipe 2 are provided on the fixing drums 11 and 12. A lifting mechanism can lifts and lowers the fixing drums 11 and 12 to the specified position in the pipe 2. A rotary drum 22 is provided on the same axis of the fixing drums 11 and 12 and rotated and driven at the center of the pipe 2. An ultrasonic wave probe 41 is attached to the rotary drum 22 through a probe arm 30. The probe is lifted and lowered to the specified position in the pipe with the lifting mechanism 43. The fixing legs 15 are opened, and fixing drums 11 and 12 are fixed on the central axis of the pipe 2 automatically. The probe 41 can be positioned on the inner surface of the pipe 2 by the combination of the reciprocal movement of the probe arm 30 and the rotation of the rotary drum 22. As a result, the automatic inspection can be performed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cylinder inner periphery inspection device for inspecting the inner periphery welded part of a cylindrical body, and is suitable for inspecting a center pipe of an intermediate heat exchanger for a high-temperature gas furnace. It is used.

[Conventional technology Cylindrical bodies with a welded structure are used in various equipment, such as intermediate heat exchangers for high-temperature gas furnaces, where welded cylinder bodies are used for the center pipe. As shown in FIG. 7, the center pipe 2 of the intermediate heat exchanger 1 has a cylindrical shape with a large diameter middle part and a small diameter manifold 4 connected to both ends of the pipe via a reducer 3. Therefore, there are circumferential weld lines 5 at a plurality of locations in the axial direction.

Periodic inspections are required for such equipment to ensure its safety, and in particular, it is necessary to conduct non-destructive inspections during the service life of major equipment, such as weld lines.

[Problems to be Solved by the Invention] However, at present, no device has been developed that can deeply damage the inner circumferential weld line 5 of the intermediate heat exchanger 1 itself. There is a need for the development of equipment that can perform flaw detection and inspection.

The present invention has been made in view of the current situation, and it is an object of the present invention to provide a cylinder inner periphery inspection device that can automatically inspect the inner periphery welded portion of a cylindrical body.

[Means for Solving the Problems] In order to solve the above problems, the cylinder inner periphery inspection device of the present invention has the following features:
A fixed cylinder inserted into the cylinder and a fixing leg that is biased in the opening direction to position the fixed cylinder on the cylinder axis; a lifting mechanism that can raise and lower the fixed cylinder to a predetermined position in the cylinder; A rotary body provided on the fixed body coaxially with the fixed body and rotationally driven on the center of the cylinder, a probe arm provided on the rotary body and movable in a radial direction inside the cylinder, and a tip end of the probe arm. The device is characterized in that it consists of a probe for inspection provided in the section.

[Function] According to this cylinder inner periphery inspection device, a rotary cylinder is provided so as to be rotationally driven on a fixed cylinder, a probe is attached to this rotary cylinder via a probe arm, and these are moved up and down the cylinder by raising and lowering Rn. In addition to being raised and lowered into a predetermined position within the body, the fixed torso is automatically fixed on the central axis of the cylindrical body by opening the fixed leg, which is provided on the fixed torso and consists of an interlocking tripod, etc. The combination of the reciprocating movement of the probe arm and the rotation of the rotary barrel allows the probe to be positioned on the periphery of the cylinder, making automatic inspection possible.

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

FIG. 1 is an external perspective view of an embodiment of the cylinder inner periphery inspection apparatus according to the present invention.

This cylinder inner periphery inspection device 10 inspects the seventh (center pipe 2 of a vertical intermediate heat exchanger 1 of a high-temperature gas furnace shown in 2I).
This is the case when the inner circumferential weld line 5 is used.

This cylinder inner circumference inspection device 10 has two cylindrical fixed cylinders 1 to be fixed at any position on the central axis inside the center pipe 2.
1.12, and as shown in Figure 2 shows the upper fixed barrel 11, they are connected at intervals through a connecting shaft 13 in the center, and both ends are clamped and tightened with upper and lower nuts 14, respectively. ing.

These fixed bodies 11, 12 are provided with fixed legs 15 for fixing them on the central axis of the center pipe 2, and the second
As shown in the upper part of the figure, the base ends of three wheel legs 16 arranged at equal intervals around the circumference and equipped with wheels 16a at the tips can be rotated by brackets 17 attached to the fixed body 11.12. is supported by An air cylinder 18 is installed in the bracket 17 to open and close these fixed legs 15, and a connecting link 20 is rotatably connected between one connecting plate connected to the rod 18a and each wheel leg 16. There is. Further, a compression coil spring 21 is inserted between the bracket 17 and the connecting plate 19, and is configured to bias the fixed leg 15 in the opening direction so that the rod 18a always sticks out, and prevents the rod 18a from being retracted. The fixed leg 15 can be closed by pressing the button.

Therefore, if the wheels 16a at the tips of the wheel legs 16 of the two sets of upper and lower fixed legs 15 attached to the fixed body 11 and 12 are brought into contact with the inner surface of the center pipe 2, the three wheel legs 16 are connected to the compression coils. It is opened and closed by the same amount with a spring of 2L,
The fixed cylinders 11 and 12 can be fixed so as to be always positioned coaxially with the center axis of the center pipe 2.

A rotary cylinder 2 provided between such fixed cylinders 11 and 12
2 has a cylindrical shape and is inserted into a connecting shaft 13 that connects the fixed cylinders 11 and 12. As shown in FIG. It is rotatably supported via a bearing 2 t1 attached to the center of 22.

In order to rotationally drive the rotating barrel 22, an internal gear 25 is formed on the inner periphery of the upper part of the rotating barrel 22, as shown in FIG.

As shown in FIG. 2, this internal gear 25 has a fixed cylinder 1
1 and is engaged with a pinion 29 driven by a rotary drive motor 28 with a brake fixed to a motor fixing base 27 connected to the connecting shaft 13 by a spline 26.

This rotating body 22 is provided with a probe arm 30 that can reciprocate and protrude outward.

As shown in FIGS. 4 and 6, the probe arm 30 is configured to slide along reciprocating guides 31 that are attached to the left and right sides of the rotary barrel 22 and are oppositely formed. Projections 30a corresponding to the positions of the reciprocating guide 31 are formed on both sides.

Further, in order to reciprocate the probe arm 30, a rack 32 is formed on the lower surface of the probe arm 30, and a brake equipped with a pinion 34 that engages with the rack 32 is attached to a fixed base 33 attached to the rotating body 22. reciprocating drive motor 35
is installed.

Further, two cylinders 36 with bottoms are formed at the tip of the probe arm 30, upper and lower, and a piston rod 36a is attached to each of them and is prevented from coming out by a pusher 37, and the bottom of the cylinder 36 is A buffer spring 38 is inserted between wI and applied to the piston rod 36a.
It is designed to absorb blows.

At the tips of these two piston rods 36a, a fifth
As shown in the figure, three approximately square probe support plates bent inward are attached with pins, and a water injection nozzle 40 is attached to the probe support plate 39, and a water injection nozzle 40 is attached below the probe support plate 39. An ultrasonic probe 41 for inspection is attached to the side.

Then, a detection signal from the ultrasonic probe 41 is sent to a deep wound instrument and data acquisition processing device 42 provided outside.

Further, a lifting mechanism 43 is provided for lifting and lowering the cylinder inner circumference inspection device 1o to an arbitrary position on the center pipe 2, which is a cylinder. As shown in FIG. 7, the lifting mechanism 43 is composed of a winding device 44 and a wire 45. center vibe 2
A winding device 44 is installed at the upper end, and the wire 45 is connected to the upper fixed barrel 11, and the lowering uses its own weight.
Only the lifting is performed by the winding device 44.

Each device is equipped with a control device and is configured to be remotely controlled.

Ultrasonic deep damage on the weld line 5 on the inner circumference of the center pipe 2 by the cylinder inner periphery inspection apparatus 10 configured as described above is carried out in the following manner.

First, in order to close the upper and lower fixed legs 15, compressed air is sent to the air cylinder 18, the rod 18a is pulled in, and the three wheel legs 16 are interlocked and closed.

Thereafter, the cylinder inner circumference inspection device 10 is placed into the center pipe 2 while the wire 45 is fed out from the winding device 44 that constitutes the elevator #j43.

Then, when the upper fixed leg 15 enters the center pipe manifold 2, the supply of compressed air to the air cylinder 18 is stopped, and the three wheel legs 16 are opened by the compression coil spring 21.

Thereafter, the vertical position of the ultrasonic probe 41 is detected by the amount of wire 45 fed out from the winding device 44 that constitutes the lifting mechanism 43, and then the cylinder inner circumference inspection device 10 is lowered, and the center pipe 2 The ultrasonic probe 41 is positioned at the welding line 5 in the inner part to bring it into a fixed state.

When the positioning is completed in this way, the probe arm 3
0, the reciprocating drive motor 35 is started and the ultrasonic probe 41 is brought into contact with the welding line 5.

When the preparation is completed in this way, water is injected from the water injection nozzle 40, and at the same time, the rotary sentry 22 is rotated by starting the rotary drive motor 28, and ultrasonic deep damage is performed along the weld line 5 on the circumference.

Then, by rotating 360 degrees, welding line 5 at one place
The deep wound is completed.

After that, after closing the wheel leg 16 as necessary, the cylinder inner circumference inspection device 10 is lowered or raised so that the ultrasonic probe 41 is located at the next weld line 5. ,
Ultrasonic exploration may be performed while rotating the rotary drum 22 in the opposite direction, or after returning 360 degrees, the rotary drum 22 may be rotated in the same direction.
2 is repeated to perform deep ultrasonic damage on all the weld lines 5.

Then, flaw detection data from the ultrasonic probe 41 associated with deep ultrasonic flaws, position data of the ultrasonic probe 41, etc. are sent to the data acquisition processing device 42 and processed, and then the display section (not shown) is sent to the data acquisition processing device 42 and processed. ), along with the results of data analysis etc.
The display is performed.

In the cylinder inner periphery inspection apparatus 10, ultrasonic flaw detection of the weld line 5 from the inside of the center pipe 2, which is a cylinder, can be performed automatically using a centrifuge operation.

Therefore, according to this cylinder inner periphery inspection device 10, the center pipe of the intermediate heat exchanger of a high temperature gas furnace can be inspected during its service life (
In the above embodiment, the fixed leg is biased in the opening direction by a compression coil spring, or by a fluid pressure cylinder such as an air cylinder. It's okay.

However, the rotary mechanism of the rotating body and the reciprocating R mechanism of the probe arm are not limited to the mechanisms of the embodiments.

Furthermore, the probe is not limited to an ultrasonic probe, but other inspection probes may be used.

Further, it goes without saying that each component may be changed without departing from the gist of the invention. [Effects of the Invention] As specifically explained above with one embodiment, the cylinder inner periphery inspection of this invention According to the device, a rotary cylinder is provided so as to be rotationally driven in the identification cylinder, a probe is attached to the rotary cylinder via a probe arm, and these are raised and lowered to a predetermined position within the cylinder by a lifting mechanism. At the same time, the fixed leg, which is provided on the fixed body and consists of an interlocking tripod, is opened to automatically fix the fixed body on the central axis of the cylinder, and the reciprocating movement of the probe arm and the fixed leg are opened. In combination with the rotation of the rotary barrel, the probe can be positioned on the inner periphery of the cylinder, making it possible to automatically inspect the inner periphery of the cylinder.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the cylinder inner periphery inspection device of the present invention, in which FIG. 1 is an external perspective view, FIG. 2 is a partial sectional view with one side of the fixed leg portion expanded, and FIG. Figure 3 is a partial sectional view of the rotary barrel, Figure 4 is a cross-sectional view of the rotary barrel, Figure 5 is an enlarged view of the probe arm, Figure 6 is a cross-sectional view of the probe arm, and Figure 7 is a cross-sectional view of the probe arm. FIG. 2 is an explanatory diagram of an object to be inspected by the cylinder inner periphery inspection device of the present invention. 1: Intermediate heat exchanger, 2: Center pipe, 3: Reducer, 4: Manifold, 5: Welding line, 10: Cylinder inner periphery inspection device, 11: L fixed body, 15: Fixing leg, 18: Air cylinder, 21: Pressed cotton coil spring, 22: Rotating cylinder, 25: Internal gear, 28: Rotating drive motor, 29: Pinion, 30:
Probe arm, 32: rack, 34: pinion, 35:
Reciprocating drive motor, 41: Ultrasonic probe, 42: Flaw detector and data collection processing/processing device, 43: Elevator shaft, 44: Winding and collecting device, 45: Wire. Figure 1 15 Fixed Eyebrow Legs Applicant Ishikawajima Ban@Heavy Industries Co., Ltd. 15 RozM Legs Figure 2 29 Pini Saiji Figure 3 Figure 4

Claims (1)

[Claims] A fixed cylinder inserted into the cylinder, a fixing leg that is biased in the opening direction to position the fixed cylinder on the cylinder axis, and an elevating mechanism that can raise and lower the fixed cylinder to a predetermined position in the cylinder. , a rotary body provided on the fixed body coaxially with the fixed body and rotationally driven on the center of the cylinder, a probe arm provided on the rotary body and movable in the radial direction of the cylinder, and a probe arm of the probe arm. A cylinder inner periphery inspection device characterized by comprising an inspection probe provided at the tip.