JPH08159744A - Coat thickness measuring device - Google Patents

Abstract

PURPOSE: To make it possible to accurately measure the thickness of a coat on the internal surface of a pipe even when the pipe is deformed by welding, etc. CONSTITUTION: The upper cashing 17a houses a sensor 32 that moves in the radial direction inside the casing 17a to measure the thickness of a coat 4 coming into contact with it, and a supporting arm 56 that moves in the radial direction to come into contact with the coat 4, thereby supporting the upper casing 17a concentrically with the pipe 2. The lower casing 17b houses supporting pins 41, 42 that move in the axial direction to come into contact with the internal periphery of the pipe 2, thereby supporting the lower casing 17b concentrically with the pipe 2. The upper casing 17a is joined to the lower casing 17b through a universal joint 45.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film thickness measuring device capable of accurately measuring the thickness of a paste-like coating film applied to the inner peripheral surface of a pipe.

[0002]

2. Description of the Related Art Generally, in a reactor pressure vessel, FIG.
As shown in FIG. 1, a lower end plate 1 for forming various instrumentation devices inside the pressure vessel body is passed through a lower end plate 1 forming the bottom portion of the pressure vessel body, and an upper end side of the lower end plate 1 of the tube 2 is inserted. The outer peripheral portion is welded to fix the pipe 2 to the pressure vessel body.

However, when the pipe 2 is welded to the lower end plate 1, the corrosion resistance of the pipe 2 may be deteriorated due to the influence of heat generated by the welding. Therefore, the required height including the welded portion 3 on the inner peripheral portion of the pipe 2 is required. A metal powder containing nickel, chromium, molybdenum, iron, etc. in a paste form is applied to form a paste-like coating film 4, and the coating film 4 is dried by a heater or heated air. Corrosion resistance has been improved by performing a so-called cladding process, in which laser irradiation is performed to solidify.

Therefore, the thickness of the coating film 4 applied to the inner peripheral surface of the tube 2 when performing the cladding process is predetermined, and therefore, when the coating film 4 is applied to the inner peripheral surface. Is
It is necessary to measure the film thickness. Therefore, a film thickness measuring device has been used conventionally, one example of which is shown in FIGS.
Is shown in.

In FIG. 10, 5 is a drive unit and 6 is a drive unit 5.
It is a main body of a measuring device for measuring the thickness of the paste-like coating film 4 by moving up and down in the tube 2 and turning by the.

The driving device 5 comprises a substrate 7 and a top plate 8 arranged on the substrate 7, and the substrate 7 and the top plate 8 are vertical guide members 9 arranged at required intervals in the circumferential direction. Connected by
A vertical screw shaft 11 having an upper end rotatably supported by a top plate 8 is connected to an output shaft of an actuator 10 such as an electric motor arranged on the substrate 7, and the screw shaft 11 is connected to the substrate 7 and the ceiling. The nut 1 attached to the lift plate 12 arranged between the plate 8 and
The swivel base 15, which is screwed onto the upper surface of the lift plate 12 and is rotatably disposed on the upper surface of the lift plate 12, can be swung by an actuator 14 such as an electric motor installed on the lower surface of the lift plate 12. A conventionally well-known clamp device 16 having a clamp portion that can be opened and closed is installed on the upper surface of 15.

As shown in FIGS. 11 to 15, the measuring device body 6 has a tubular casing 17 having an outer diameter which can be accommodated in the pipe 2 and whose upper and lower ends are closed, and a rod connected to the lower end of the casing 17. The lower end of 18 can be clamped to the clamp device 16 of the drive device 5.

An air cylinder 19 is housed vertically downward in the upper part of the casing 17 as shown in FIG.
A head 22 attached to the lower end of the piston rod 19a of the air cylinder 19 is attached to a block 22 via a horizontal pin 21.
And a rod 23 extending downward is attached to the lower end of the block 22. In addition, as shown in FIG. 13 and FIG. 14 in an enlarged manner,
An arc-shaped seat 24 protruding downward is provided, and a nut 25 is screwed to the lower end of the rod 23.

Bracket 2 mounted in casing 17
6 to the arm 28 via a pin 27 parallel to the pin 21.
The arm 28 extends vertically around the pin 27, and the upper end of the arm 28 has a U-shaped cutout groove 28a.
It engages with the rod 23 via and contacts the lower end of the seat 24. The arm 28 is pressed against the lower end of the seat 24 by a spring 29 wound around the rod 23 so as to be located below the seat 24.
A U-shaped cutout groove 28b is formed.

A guide member 31 having a guide hole 31a extending in the radial direction is provided in an opening 30 provided near the lower end of the arm 28 of the casing 17, and a casing 1 is provided.
7, a sensor support member 33 having a contact type sensor 32 attached to the tip of the casing 17 is fitted in a guide hole 31a of the guide member 31 so that the sensor support member 33 can move forward and backward in the radial direction of the casing 17. Have been combined.

Further, the casing 17 of the sensor support member 33.
A pin 34 parallel to the pin 27 is provided at the rear end on the center side,
The pin 34 is fitted in a notch groove 28b at the lower end of the arm 28.

Below the position where the sensor 32 of the casing 17 is arranged, vertically upward or vertically downward air cylinders 35 and 36 are required vertically as shown in FIGS. 12, 15, 16 and 17. It is stored with a space of
Piston rods 35a, 36 of the air cylinders 35, 36
At the upper end or the lower end of a, there are conical taper guides 37, 38 having a diameter gradually decreasing toward the upper side or the lower side.
Are connected, and the taper guides 37, 38 are hollow cylindrical guide members 39, which are concentrically mounted in the casing 17.
It is fitted with respect to 40 so that it can slide in the vertical direction.

On the outer circumferences of the taper portions of the taper guides 37 and 38, at least three places at required intervals in the circumferential direction, along the taper surface, dovetail grooves 37a having a sectional shape as shown in FIG.
38a is formed, and the rear ends of the support pins 41, 42 extending in the radial direction of the casing 17 and having a spherical tip are fitted in the dovetail grooves 37a, 38a so as to fit into the dovetail grooves 37a, 38a. ing. Thus, the rear ends of the support pins 41, 42 are made to match the taper of the taper guides 37, 38.
It is formed obliquely when viewed from the side.

Further, the support pins 41 and 42 are provided with a guide member 39.
And casing 17, guide member 40 and casing 17
When the taper guide 37 is moved up and the taper guide 38 is moved down, the support pins 41 and 42 are inserted into the guide holes 43 and 44 formed in the radial direction.
It is pushed by the taper surface of Nos. 7 and 38 and slides against the guide holes 43 and 44, and the tip thereof is guided from the guide holes 43 and 44 to the casing 1.
7, when the taper guide 37 descends and the taper guide 38 rises, the support pins 41 and 42 are pulled by the taper guides 37 and 38, and the tips thereof are guided by the guide hole 4.
It can be retracted into 3,44.

When the thickness of the paste-like coating film 4 applied to the inside of the tube 2 is measured, the rod 18 connected to the casing 17 is installed on the swivel base 15 of the drive unit 5, as shown in FIG. The measuring device main body 6 is connected to the driving device 5 by being clamped by the clamp device 16 provided,
The driving device 5 is set below the predetermined pipe 2, the measuring device main body 6 is inserted into the pipe 2, and the actuators 10 and 14 are driven. For this reason, the screw shaft 11 rotates, the lifting plate 12 rises, the casing 17 reaches a predetermined height in the pipe 2,
Further, the swivel base 15 swivels, the casing 17 swivels in the circumferential direction of the tube 2, and the sensor 32 reaches the position where the thickness of the coating film 4 is measured.

When the sensor 32 reaches the measurement position of the coating film 4, the air cylinders 35 and 36 are operated to project the piston rods 35a and 36a, the taper guide 37 is moved up, and the taper guide 38 is moved down. Therefore, the support pins 41, 42 are pushed by the tapered surfaces of the taper guides 37, 38 and project outward in the radial direction of the casing 17, and the tips thereof come into contact with the inner peripheral surface of the pipe 2 as shown in FIG. ,
The measuring device body 6 is fixed to the tube 2.

When the air cylinder 19 is operated, the piston rod 19a is retracted to move the head 20 and the block 2
2. The rod 23 and the seat 24 are pulled up by the piston rod 19a and ascend. Further, since the upper end of the arm 28 is biased upward by the spring 29, as the head 20 rises, the arm 28 pivots about the pin 27 so that the upper end of the arm 28 moves upward. The lower end moves from the center side of the casing 17 toward the inner peripheral side of the casing 17, the sensor support member 33 is guided by the guide member 31 and advances in the radial direction of the casing 17, and the tip end thereof is as shown in FIG. 17 protruding outside, sensor 3
2 contacts the surface of the coating film 4.

When the tip of the sensor 32 comes into contact with the surface of the coating film 4, for example, when the sensor 32 is an eddy current type, the strength of the eddy current generated by turning on the sensor 32 is measured, From the result, the thickness of the coating film 4 is obtained.

Since the sensor 32 is pressed against the coating film 4 by the elastic force of the spring 29, the sensor 32 does not apply an excessive force to the coating film 4, and the paste-like coating film 4 is protected. .

When the measurement of the coating film 4 at the predetermined position is completed, the air cylinder 19 is operated to operate the piston rod 19
a is lowered, the upper end of the arm 28 is pressed downward by the seat 24, and the arm 28 is rotated so that the upper end moves downward. Then, the sensor support member 33 retracts toward the center of the casing 17, and the sensor 32 is housed in the casing 17 as shown in FIG.

When the piston rod 35a is lowered by the air cylinders 35 and 36 and the piston rod 36a is raised, the taper guide 37 is lowered and the taper guide 3 is moved.
When 8 is raised, the support pins 41 and 42 are pulled by the taper guides 37 and 38, retracted in the direction away from the inner circumference of the pipe 2, and are housed in the casing 17.

When the sensor 32 and the support pins 41, 42 are housed in the casing 17, the actuators 10, 14
To move the casing 17 up and down and turn it to stop the sensor 32 at the next measurement position of the coating film 4,
As described above, the support pins 41 and 42 are attached to the casing 17
The measuring device body 6 to the tube 2 by projecting from the
The sensor 32 is also projected from the casing 17 and brought into contact with the coating film 4, and the thickness of the next portion of the coating film 4 is measured.

[0023]

In the above film thickness measuring apparatus, the thickness of the coating film 4 can be accurately measured when the tube 2 is vertical.

However, since the pipe 2 is welded to the lower end plate 1 of the pressure vessel body, the pipe 2 may be slightly bent or deformed in the vicinity of the welded portion 3 as shown in FIG.
Therefore, when the tube 2 is deformed, the conventional film thickness measuring apparatus is held in an eccentric state with respect to the tube 2, as shown in FIG. As shown in, the sensor 32 has an excessive gap G with respect to the inner peripheral surface of the coating film 4.
When touching, there will be a large error in the measured value.

In view of the above situation, the present invention is to enable the coating film applied to the inner peripheral surface of a pipe to be accurately and accurately measured even when the pipe is deformed under the influence of welding. It was done as a purpose.

[0026]

The present invention comprises an upper casing and a lower casing which are connected via a universal joint and which can be raised and lowered and swiveled. The upper casing is in contact with a coating film applied to the inner circumference of the pipe. And a sensor that is movable in the casing radial direction to detect the thickness of the coating film by the contact with the inner circumferential surface of the coating film or the inner circumferential surface of the pipe to support the upper casing concentrically with the pipe. A movable first supporting means is accommodated, and a lower casing is provided with a second supporting means movable in a casing radial direction, the second supporting means being in contact with the inner peripheral surface of the pipe and supporting the lower casing concentrically with the pipe. It is stored.

Further, in the present invention, three or more sets of the first supporting means can be provided in the circumferential direction of the pipe, and the height direction position of the first supporting means is substantially the same as the height direction position of the sensor. It is possible to provide three or more sets of the second supporting means in the circumferential direction of the tube, and the second supporting means can be provided at a plurality of positions in the longitudinal direction of the tube.

[0028]

When the thickness of the coating film on the inner circumference of the pipe is detected, the lower casing is supported concentrically with the inner circumferential surface of the pipe by the first means, and the upper casing is supported on the inner circumferential surface of the pipe by the second supporting means. The thickness of the coating film is accurately measured even if the pipe is deformed because the sensor tip is brought into contact with the inner surface of the coating film while holding it concentrically with the inner surface of the coating film. Can be measured.

Three or more sets of first supporting means are provided in the circumferential direction of the pipe, or the position of the first supporting means in the height direction is substantially the same as the position of the sensor in the height direction, or the second supporting means. If three or more sets of the above are provided in the circumferential direction of the tube, or if the second supporting means is provided at a plurality of positions in the longitudinal direction of the tube, the thickness of the coating film can be measured more accurately.

[0030]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 9 show an embodiment of the present invention. Since the basic structure is common to that of the conventional apparatus, the same components as those of the conventional apparatus are designated by the same reference numerals and the description thereof will be omitted.
Thus, the device of this embodiment is the casing 17 of the conventional device.
Is divided into an upper casing 17a and a lower casing 17b, and the upper casing 17a and the lower casing 17 are
b is connected by a universal joint 45 described later, the sensor 32 is installed in the upper casing 17a, and a support arm 56 described later is installed, and the support pins 41,
This is different from the conventional device in that 42 is installed.

That is, as shown in FIG. 7, the lower end of the upper casing 17a is provided with a male connecting portion 46 whose lower end projects in a spherical shape, and the upper end of the lower casing 17b is recessed in a spherical shape at its upper end. The female joint 47 is attached, and the male joint 46 is fitted into the female joint 47 to form the universal joint 45. Thus, the upper casing 17a can be freely bent in any direction according to the deformed state of the tube 2. In FIG. 7, reference numeral 48 denotes a cylindrical flexible cover that covers a gap formed in the connecting portion between the upper casing 17a and the lower casing 17b.

As shown in FIGS. 4 and 5, an air cylinder 49 is housed vertically upward below the sensor support member 33 in the upper casing 17a. The air cylinder 49 has a piston rod 49a having an upper end and a lower end. A boss 50 having a seat 50a is fitted and fixed, and a stopper 51 having an outer diameter larger than that of the boss 50 is provided at the upper end of the piston rod 49a.
Is installed.

On the outer periphery of the boss 50, the upper casing 17
A seat 52 having a bracket 52a protruding in the axial direction of a is externally fitted so as to be slidable in the axial direction of the boss 50,
Between the seat 50a of the boss 50 and the seat 52 to which the bracket 52a is attached, a spring 53 for urging the seat 52 against the stopper 51 is arranged so as to be wound around the boss 50.

Three sets of horizontal pins 55 are attached to the bracket 54 attached to the inner periphery of the upper casing 17a, and a support arm 56 is attached to the pins 55 so as to be rotatable in a vertical plane. There is. Thus, the support arm 56
Is provided at the lower end of the body portion 56b and the body portion 56b, which are provided so as to extend in the direction intersecting the head portion 56a behind the head portion 56a and the head portion 56a, and to face in the direction intersecting the body portion 56b. The tail portion 56c is provided and the side surface shape is shown in FIGS.
As shown in FIG. 5, the U-shaped notch groove 56d provided at the end of the tail portion 56c is engaged with the pin 57 attached to the bracket 52a so as to be parallel to the pin 55. Cage, piston rod 49a of air cylinder 49
Is raised, the seat 52 is urged by the spring 53 and rises, so that the support arm 56 is moved through the pin 57.
The head 56a is rotated about the pin 55 so that the head 56a moves downward, and an opening 58 formed in the upper casing 17a so that the tip of the head 56a is positioned at substantially the same level as the opening 30.
The upper casing 17a projects outward from the upper casing 17a so as to come into contact with the inner peripheral surface of the coating film 4.

Next, the operation of this embodiment will be described.

When the thickness of the paste-like coating film 4 applied to the inside of the tube 2 is measured, as shown in FIG. 1, the measuring device body 6 is driven via the rod 18 as in the conventional device. 5, the driving device 5 is set below the predetermined pipe 2, the measuring device main body 6 is inserted into the pipe 2, and the actuators 10 and 14 are driven. Therefore, the measuring device main body 6 moves up and down and turns, and when the sensor 32 reaches the location where the thickness of the coating film 4 is to be measured, the taper guides 37 and 38 are raised or lowered by the air cylinders 35 and 36, and the support pins 41 and 42. Is projected and the tip thereof is brought into contact with the inner peripheral surface of the pipe 2, and the lower casing 17b of the measuring device main body 6 is supported by the pipe 2.

When the air cylinder 49 is actuated to raise the piston rod 49a, the boss 50 also rises and the spring 53 is compressed, so that the reaction force causes the pin 57 to rise in the same manner as the seat 52 and the bracket 52a. The arm 56 rotates about the pin 55 so that the head portion 56a moves downward, the tip of the head portion 56a abuts on the inner peripheral surface of the coating film 4, and the upper casing 17a of the measuring device main body 6 moves to the pipe 2 It is supported on the inner surface. At this time, the seat 52 is pushed by the spring 53 and rises, but since it abuts on the stopper 51, it does not fall off the boss 50.

Further, the air cylinder 19 causes the arm 28 to move.
Is rotated to move the sensor support member 33 forward,
2 is projected from the guide member 31 and brought into contact with the coating film 4,
The thickness of the coating film 4 is measured as in the conventional case.

Even when the upper portion of the pipe 2 is deformed due to the influence of welding as shown in FIG. 8, the support arm 56 is projected outward of the upper casing 17a and brought into contact with the inner circumference of the pipe 2. Thus, the male joint portion 46 of the universal joint 45 attached to the lower end of the upper casing 17a becomes the female joint portion 47 of the universal joint 45 attached to the upper end of the lower casing 17b.
The upper casing 17a inclines according to the deformation of the upper portion of the pipe 2 while freely sliding. Therefore, the tip of the sensor 32 contacts the inner peripheral surface of the coating film 4 without forming a gap as shown in FIG. 9, so that the accuracy of measuring the thickness of the coating film 4 by the sensor 32 is improved.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0042]

According to the film thickness measuring device of the present invention, in the case of claim 1, the thickness of the coating film can be accurately and accurately detected even when the pipe is deformed due to the influence of welding or the like. In the cases of items 2, 3, 4, and 5, various excellent effects such as more accurate and accurate detection than in the case of claim 1 can be obtained.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of a film thickness measuring device of the present invention.

FIG. 2 is a vertical cross-sectional view of an upper casing in the film thickness measuring device of the present invention.

FIG. 3 is a vertical cross-sectional view of a lower casing in the film thickness measuring device of the present invention.

FIG. 4 is an enlarged view showing a state where the sensor and the support arm of FIG. 2 are housed in an upper casing.

FIG. 5 is an enlarged view showing a state where the sensor and the support arm in FIG. 2 project outward from the upper casing.

6 is a VI-VI direction arrow view of FIG.

FIG. 7 is a vertical sectional view of a universal joint connecting an upper casing and a lower casing in the film thickness measuring device of the present invention.

FIG. 8 is a front view showing a state in which the upper casing is bent in accordance with the deformation of the pipe when the film thickness measuring device of the present invention is inserted into the pipe when the pipe having the coating film coated on the inner surface is deformed. .

9 is a view taken in the direction of arrow IX-IX in FIG.

FIG. 10 is a front view of an example of a conventional film thickness measuring device.

FIG. 11 is a vertical cross-sectional view of an upper portion of a casing in a conventional film thickness measuring device.

FIG. 12 is a vertical sectional view of a lower portion of a casing in a conventional film thickness measuring device.

FIG. 13 is an enlarged view showing a state where the sensor of FIG. 11 is housed in a casing.

FIG. 14 is an enlarged view showing a state in which the sensor of FIG. 11 projects outward from the casing.

FIG. 15 is a vertical cross-sectional view of a mechanism for projecting or retracting an upper support pin in a conventional film thickness measuring device.

FIG. 16 is a vertical cross-sectional view of a mechanism for causing a lower support pin to project or retract in a conventional film thickness measuring device.

17 is a view taken in the direction of arrow XVII in FIGS. 15 and 16. FIG.

FIG. 18 is a front view showing a state in which a conventional film thickness measuring device is inserted into a pipe when the pipe having the coating film coated on the inner surface is deformed.

FIG. 19 is a view on arrow in the XIX direction of FIG. 18.

20 is an enlarged view of an XX section of FIG.

FIG. 21 is a vertical cross-sectional view showing a state in which a paste-like coating film is applied to the inner peripheral surface of a pipe welded to the pressure vessel body.

[Explanation of symbols]

 2 pipe 4 coating film 17a upper casing 17b lower casing 32 sensor 41, 42 support pin (second support means) 45 universal joint 56 support arm (first support means)

Claims (5)

[Claims] 1. An upper casing and a lower casing which are connected via a universal joint and which can be raised and lowered and swiveled freely. The upper casing is in contact with the coating film coated on the inner circumference of the pipe to detect the thickness of the coating film. A sensor movable in the casing radial direction, and contacting the inner peripheral surface of the coating film or the inner peripheral surface of the pipe to support the upper casing concentrically with the pipe,
A first support means that is movable in the casing radial direction is housed, and a lower casing is in contact with the inner peripheral surface of the pipe to support the lower casing concentrically with the pipe. A film thickness measuring device, characterized in that the supporting means of (1) is housed. 2. The film thickness measuring device according to claim 1, wherein three or more sets of first supporting means are provided in the circumferential direction of the tube. 3. The film thickness measuring device according to claim 1, wherein the height direction position of the first supporting means is substantially the same as the height direction position of the sensor. 4. The film thickness measuring device according to claim 1, 2 or 3, wherein three or more sets of second supporting means are provided in the circumferential direction of the tube. 5. The film thickness measuring device according to claim 1, wherein the second supporting means is provided at a plurality of positions in the longitudinal direction of the tube.