JPH0729449Y2 - Pipe wall thickness measuring device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a pipe wall thickness measuring device applied to a tube such as a superheater or a reheater of a boiler.

[Prior Art] In regular and aged inspections of boilers and the like, the wall thickness of various pipes is measured to confirm its soundness. In other words, if the pipe is thinned due to oxidative corrosion, etc., it will blow up and cause an accident that will stop the boiler.To prevent this, apply the ultrasonic thickness gauge probe (sensor) to the target site in advance. Then, the wall thickness of each pipe is measured to make a decision such as replacement. Conventionally, all of these inspection operations are performed manually, and in recent years, various inspections by remote automation, which have been particularly desired, have not been performed so far.

[Problems to be solved by the device]

In the conventional inspection, various tubes such as boilers are densely packed as shown in Fig. 2, and the intervals between the tubes are only around 100 mm including the curved parts that are frequently blown up. In order to enter, it is necessary to pull and widen the interval of the pipe with a chain block, etc., which also has a limit, so it is difficult to work in a narrow space, and it is also necessary to construct a scaffold at a high place, which requires a lot of time and labor. Was needed. Further, this causes a problem that measured values are likely to vary from person to person.

In addition, there was a problem that the space between the tubes could not be expanded enough for people to enter, and there were places where measurements could not be performed at all.

The present invention is intended to solve the above problems.

[Means for Solving the Problems]

The pipe wall thickness measuring device of the present invention comprises a rail fixed to the uppermost part of the outermost pipe of the pipe row, a carriage mounted on the rail and traveling,
A hoist that is suspended from the same vehicle by a wire and moves up and down, a gripping mechanism that is connected to the hoisting machine and has a claw for gripping a pipe, and an upper arm, a lower arm, a wrist bending and a wrist twist that are sequentially joined to the gripping mechanism. , A C-shaped swivel ring that swivels around the outer circumference of the pipe, provided on the wrist twist of the joint arm,
Further, it is characterized in that a probe of an ultrasonic thickness gauge provided inside the C-shaped swivel ring is provided.

[Action]

Inspection of tubes such as boilers using the above-mentioned device of the present invention is carried out according to the following procedure for each tube. The device of the present invention is usually outside the arrayed pipes before the start of the inspection, and at the start of the inspection, first, the carriage is laterally moved to a predetermined position, and the wire is wound by the winding machine to hold the gripping mechanism. Adjust to the desired height.

Next, the gripping mechanism is operated, and the outermost one of the arranged tubes is gripped by the claw to fix the gripping mechanism.

When the gripping mechanism is fixed, the upper arm and the lower arm are actuated to insert it between the arranged tubes, set the wrist bend at a predetermined position near the tube to be inspected, and then bend the wrist and twist the wrist. Is operated to set the C-shaped turning ring at a position where the probe provided on the C-shaped turning ring contacts the pipe to be inspected.

When the C-shaped swivel ring is swung in the above state,
The probe slides along the outer circumference of the pipe to be inspected, and the ultrasonic thickness gauge measures the wall thickness of the pipe to be inspected one by one.

Due to the above, we have realized a pipe wall thickness measurement device that can be inserted between arranged pipes and operated easily remotely and automatically.Therefore, there is no need to expand the pipes or disassemble the scaffold, which reduces costs and construction period. We were able to shorten the time and improve the safety, and also greatly expanded the measurable range.

〔Example〕

 An embodiment of the present invention is shown in FIGS.

This embodiment shown in FIGS. 1 to 3 is an element (tube) of a tube row.
E is applied to a boiler suspension type superheater in which the pitch P is arranged in the width direction Z of the boiler as shown in FIG. 2, and 1 is the maximum of the elements E arranged at appropriate intervals. A screw tightening clamp arranged on the upper part of the external element Ea, 2 is a rail provided and supported by the clamp 1, 3
Is a trolley suspended from the rail 2 and electrically driven in the width direction Z of the boiler, 4 is a hanging wire hung from the trolley 3, 5 is a hoist that winds the wire 4 and moves up and down in the vertical direction Y, and 6 is the same. Claws 8,8a that are connected to the hoist 5 and that are opened and closed by air cylinders 7,7a
A chucking mechanism main body for holding the outermost element Ea having the above, 9 is joined to the main body 6 and enters between the elements E to rotate A in the XY plane, and 10 is joined to the tip of the same upper arm and rotates in the XY plane. B is a lower arm, 11 is a wrist bend that is joined to the tip of the lower arm 10 and rotates C on the XY plane, and 12 is a wrist twist that rotates D on a plane orthogonal to the XY plane. It forms a joint arm with the wrist bend 11.

13 is a C-shaped swivel ring that is provided at the tip of the wrist twist 12 and expands and contracts, 14 is provided inside the C-shaped swivel ring 13, and the distance L from the tip surface to the rotation center F of the wrist bend 11 is the bending of the pipe. The ultrasonic thickness gauge is arranged so as to match the radius reference value R.

In the hoisting machine 5, as shown in FIG. 4, 16 sheaves for winding the wire 4 are directly connected to a motor 15 fixed to the body of the hoisting machine 5, and the sheave 16 is connected to the wire 4. An arc-shaped lever 19 having one end supported by a fixing pin 17 and a plurality of pressure rollers 18 arranged so as to press the wound portion of the wire 4 around the sheave 16 A pressing screw 20 that is screwed into the main body is attached to the other end of the lever 19 via a spring 21. When the weight W of the main body 6 is applied to the hoist 5, the pressure roller The pressing force of 18 generates a frictional force between the wire 4 and the sheave 16, and the sheave 16 can be moved up and down by the rotation of the sheave 16 by the motor 15.

As shown in FIG. 5, the chucking mechanism of the main body 6 has movable claws 8 and 8a attached to the tips of the driving rods of the air cylinders 7 and 7 so that the element Ea is sandwiched between the fixed claws protruding from the main body 6. It is provided.

The upper arm 9 and the lower arm 10 are provided with a rotating mechanism as shown in FIG.

That is, 28 is a motor fixed to the main body 6, the output shaft of which is attached to the upper arm 9 and the tip of which is supported by the bearing 29. Reference numeral 30 is a motor fixed to the tip of the upper arm 9, the output shaft of which is attached to the lower arm 10, and the tip of which is a bearing.
Supported by 31.

Further, the wrist bending 11 and the wrist twist 12 are provided with a rotating mechanism as shown in FIG.

That is, 22 is a motor fixed to the tip of the lower arm 10, and an arm of the wrist bending 11 is attached to the output shaft of the motor, and a bearing 23 is provided at the tip of the output shaft. Further, 24 is a motor fixed in the wrist bend 11, and the shaft of the wrist twist 12 is attached to its output shaft.

Further, the C-shaped turning ring 13 is provided with a turning mechanism as shown in FIG.

That is, 25 is a case, 26 is a motor fixed to the case 25, 27 is a pinion attached to the output shaft of the motor 25, and meshes with external teeth provided on the outer circumference of the swivel ring 13.

The inspection using the apparatus of the present embodiment is performed for each element E in the following procedure.

The apparatus of this embodiment before the start of the above inspection is usually outside the arrayed elements E, the air cylinders 7 and 7a are pulled to open the pawls 8 and 8a, and the main body 6 is wound via the wire 4. It is in a state of being suspended by 5.

At the start of the inspection of the apparatus of this embodiment, first, the carriage 3 is moved to move the main body 6 laterally to the element Ea to be inspected, and the desired height is adjusted by the hoist 5, and then the air cylinders 7 and 7a. Press to close the pawls 8 and 8a so as to grab the outermost element Ea, and hold the main body 6.

Next, the upper arm 9 and the lower arm 10 are appropriately rotated and inserted between the elements E, and in the case of a curved portion, positioning is performed so that the bending center G of the bending radius G of the element Ea matches the rotation center F of the wrist bending 11. To do.

After performing the above positioning, the wrist bend 11 is rotated to align its tip with the center of the arc of the curved part, and the wrist twist 12 is rotated to twist the C-shaped swivel ring 13 so as to wind the element Ea. Apply 14 to element Ea side. In addition,
When the upper arm 9 and the lower arm 10 are rotated to be inserted between the elements E, the wrist twist 12 directs the C-shaped turning ring 13 between the elements E so that the narrow elements E can be passed.

Next, the wrist bend 11 is rotated, and the sensor 14 moves the element Ea
While rotating C along the arc of the outer surface of the curved part of C and rotating H of the C-shaped rotating ring 13 to slide the sensor 14 along the circumference of the element Ea, the ultrasonic thickness gauge is used one by one. When the wall thickness is measured, the minimum value is obtained by data processing, and it is compared with the value of the element Ea at the time of new pipe, the degree of wall thinning is known, the life is predicted, and the value is lower than the design allowable value. Determine the replacement.

The wall thickness of the pipe is measured by the apparatus of the present embodiment, as shown by the chain line in FIG. 1, the lower left bent portion J, the right bent portion K, the inner bent portion M, the upper bent portion N, the straight portion. The tube D can be measured in the same manner as above.

Due to the above, since a pipe wall thickness measuring device that can be inserted between the arrayed elements and operated easily remotely and automatically has been realized, there is no need to expand the elements or disassemble and disassemble the scaffold, reducing costs, shortening the construction period, We were able to improve safety and greatly expand the measurable range.

[Effect of device]

INDUSTRIAL APPLICABILITY The pipe wall thickness measuring device of the present invention is a truck that travels on a rail arranged on a pipe, a hoisting machine suspended by a wire on the bogie, a gripping mechanism connected to the hoisting machine, and a gripping machine. By having the joint arm joined to the mechanism and the C-shaped swing ring joined to the joint arm and provided with the inside of the probe, it is possible to easily and remotely and automatically insert it between the arranged tubes. Since we have realized a pipe thickness measuring device that can be operated, there is no need to expand the space between pipes or disassemble and disassemble the scaffold, reducing costs, shortening the construction period, and improving safety, and further increasing the measurable range. Could be expanded to.

[Brief description of drawings]

FIG. 1 is an illustration of an embodiment of the present invention, and FIG. 2 is an illustration of FIG.
II-II arrow view, FIG. 3 is a III-III arrow view of FIG. 1, FIG. 4 is an explanatory view of the hoisting machine of the above-mentioned one embodiment, and FIG. 5 is a checking mechanism of the above-mentioned one embodiment. Explanatory drawing, FIG. 6 is an explanatory view of the upper arm and lower arm of the above-mentioned one embodiment, FIG. 7 is an explanatory view of wrist bending and wrist twist of the above-mentioned one embodiment, and FIG. 8 is a C-shaped turning of the above-mentioned one embodiment. It is explanatory drawing of a ring. 1 ... Clamp, 2 ... Rail, 3 ... Truck, 4 ... Wire, 5 ... Hoisting machine, 6 ... Checking mechanism body, 7,
7a …… Air cylinder, 8,8a …… Claw, 9,10 …… Arm, 11 ……
Wrist bend, 12 …… wrist twist, 13 …… C-shaped swivel ring,
14 …… Probe, 15 …… Motor, 16 …… Sheave, 17 …… Fixing pin, 18 …… Pressure roller, 19 …… Lever, 20 …… Pressing screw, 21 …… Spring, 22 …… Motor , 23 …… Bearing,
24 …… motor, 25 …… case, 26 …… motor, 27 …… pinion, 28 …… motor, 29 …… bearing, 30 …… motor, 31
……bearing.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Ken Ken Fujita 2-1-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture Mitsubishi Heavy Industries, Ltd. Takasago Research Institute (72) Yoshihisa Nishikawa 2-1-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture No. 1 Mitsubishi Heavy Industries Takasago Research Center

Claims (1)

[Scope of utility model registration request] 1. A rail fixed to the uppermost part of the outermost pipe of a row of pipes, a carriage mounted on the rail for traveling, a hoisting machine that is suspended by the wire by a wire, and hoists and hoists. A gripping mechanism having a claw for gripping a pipe, an articulated arm consisting of an upper arm, a lower arm, a wrist bending and a wrist twist connected to the gripping mechanism in sequence, and a wrist twist of the same joint arm so that the circumference of the pipe is wound. A pipe wall thickness measuring device comprising: a C-shaped swivel ring that swivels in a vertical direction, and an ultrasonic thickness gauge probe provided inside the C-shaped swivel ring.