JP2590733Y2 - Film thickness measuring device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the thickness of a coating such as an oxide film adhered to the surface of a metal tube.

[0002]

2. Description of the Related Art Conventionally, no apparatus has been developed for measuring and measuring the thickness of an oxide film or the like on the surface of a metal tube by supporting the metal tube for measurement and observing the metal tube. It is not possible to measure in a state, and conventionally, the metal tube was cut into slices and the film thickness was measured by microscopic observation.
Also, when measuring with a contact type sensor, there is no special support for measuring the pipe, and if the metal pipe is bent or changed, the sensor contacts the pipe surface and the measurement is performed. It took a lot of time to do that.

[0003]

[Problems to be Solved by the Invention] As described above, conventionally, it takes a considerable amount of time to measure the thickness of an oxide film or the like on the surface of a tube, and the measurement is performed by destroying the tube itself. ,
The broken tube could not be reused. Also, even if the thickness is measured without destroying the tube with a contact-type sensor, if the tube is bent or deformed as described above, the measurement needs to be devised, requiring considerable time and labor. there were.

In order to solve such a problem, the present invention measures the thickness of a coating caused by oxidation or the like of the surface of a metal tube using a contact type sensor without breaking the tube. It is an object of the present invention to realize a measuring device in which a sensor can easily follow a tube which is bent or deformed as well as a tube.

[0005]

In order to solve the above-mentioned problems, in the present invention, a movable case is floated and supported by a coil spring inside a housing, and a pair of fixed and movable guide rollers arranged above and below the movable case is provided. Even if the metal tube is bent by inserting the metal tube, the guide roller is always in contact with and held by these guide rollers. Between the upper and lower guide rollers, a sensor mounting bracket containing a sensor for measuring film thickness and a sensor guide holding this bracket are provided so that the sensor can move in the axial direction and the sensor tip always contacts the metal tube. To place.
Further, in the vertical direction, the movable case is supported by a coil spring via a holding plate, a spacer, and a steel ball inserted in a small hole provided in the spacer on the upper and lower sides of the movable case, and the movable case is configured to be movable, and the metal tube is moved. Even if there is a song, the movable case follows,
This enables stable and reliable measurement of the thickness of the coating on the metal tube.

That is, the present invention provides a box-like shape which is provided inside a housing for inserting a metal tube up and down to inspect a film such as an oxide film on the surface of the metal tube, and having an open portion on one side surface. A movable case, a side surface coil spring for supporting each side surface of the movable case in the housing, and a vertical coil spring for supporting the upper and lower surfaces of the movable case in the housing via a holding plate, a spacer and a steel ball. A coil spring, a pair of fixed and movable guide rollers disposed respectively above and below the movable case for holding the metal tube therebetween, and pulling the upper and lower movable guide rollers toward the fixed guide roller side A tension coil spring for sandwiching the metal tube, and a slide bush between the upper and lower guide rollers at an open portion of the movable case. A sensor mounting bracket housed so as to be in contact with the tube surface, a spring support bar fixed to the movable case, and one end connected to and held by the sensor mounting bracket, and a coil spring attached to the other end of the spring support bar. And a stopper for stopping the rotation of the sensor guide provided at an opening of the side surface of the movable case.

[0007]

Since the present invention is constructed as described above, a metal tube is inserted into the housing for measurement, and the movable case is floatingly supported by the housing with side and vertical coil springs. In addition, since the upper and lower fixed and movable guide rollers are always in contact with the metal tube, even if the metal tube is deformed in the axial direction, the movable case can follow this change, and the sensor for measuring the thickness of the coating can always follow.

Further, a sensor mounting bracket is connected to a sensor guide movably mounted in the movable case,
The sensor for measuring the thickness of the coating inserted into this sensor mounting bracket always follows the movement and change of the pipe together with the sensor guide, and makes the sensor contact the pipe surface, so that the thickness of the coating of the pipe is stable and sure. Can measure.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. 1 is a sectional view of a film thickness measuring apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line PP of FIG. 1, FIG. 3 is a sectional view taken along line QQ of FIG. 1, and FIG. It is RR sectional drawing.

In FIG. 1, the film thickness measuring apparatus of the present invention is held on both sides by coil springs 3 and 4 supporting the side surface of a movable case 2 in a housing 1 (the coil spring 4 is shown in FIG. 3).
The upper and lower directions are held by a coil spring 8 for up and down through a holding plate 5, a spacer 6, and a steel ball 7 inserted into a small hole 6a provided in the spacer 6. An insertion guide 10 for a pipe 9 made of metal or the like is provided at an upper portion of the housing 1. The spacer 6 and the insertion guide 10 are made of a synthetic resin (for example, Teflon) to reduce friction.

The movable case 2 is box-shaped and has an opening for mounting a sensor mounting bracket 13 on the left end. Inside the movable case 2, fixed and movable guide rollers 11 and 12 are provided on the left and right, respectively, and these two sets are provided. Between the guide rollers, the sensor mounting bracket 13 is provided at the open portion of the movable case 2 with a slide bush 14.
Is slidably mounted via the. The tip of the sensor mounting bracket 13 is formed into a curved surface so that the pipe 9 can easily pass through. A contact sensor 15 for measuring the thickness of the coating of the tube 9 is inserted into the sensor mounting bracket 13. The tip of the sensor 15 is mounted so as to be in contact with the pipe 9 so as to be flush with the above-mentioned curved surface. Sensor mounting bracket 13 is nut 1
6, the sensor guide 17 is attached to the left end of the sensor guide 17, and the right end of the sensor guide 17 is elastically supported by a coil spring 19 on a spring support rod 18 fixed to the movable case 2.

FIG. 2 is a cross-sectional view taken along the line PP of FIG. 1. A stopper 21 is attached to the side opening 20 of the movable case 2, and the sensor guide 17 rotates around the center line of the sensor mounting bracket 13. I try not to. The sensor mounting bracket 13 is held by a slide bush 14 and is freely movable in the axial direction in which the sensor is inserted.
Since the coil 7 is always pulled to the right by the coil spring 19, the tip of the sensor 15 inserted into the sensor mounting bracket 13 is always in contact with the tube 9.

FIG. 3 is a sectional view taken along line Q--Q of FIG. 1. As described above, the movable case 2 has four coil springs 3 on each side surface.
And 4 and is normally held in a neutral position. In this embodiment, each of the coil springs 3 and 4 is supported by four pieces. However, the number is not limited to this number, and may be larger as long as the movable case 2 is stably held. Things.

The fixed guide roller 11 has a V
The roller is a mold-shaped roller and is supported via a bearing 23 on a shaft 22 fixed to the movable case 2. The movable guide roller 12 is supported by a movable shaft 24 via a bearing 23, and has a smooth roller surface. The movable shaft 24 is always drawn toward the fixed guide roller 11 by a tension coil spring 26 attached to a spring fitting 25. The movable shaft 24 is slidably supported in an oblong hole 27 provided on the side surface of the movable case 2.

FIG. 4 is a sectional view taken along line RR of FIG.
Is placed in a small hole provided in the spacer 6, and the thickness of the spacer 6 is slightly smaller than the diameter of the steel ball 7, so that the pressing plate 5 and the inner surface of the housing 1 are pressed by the coil spring 8 to The movable case 2 can be smoothly slid by the steel balls 7 on the upper and lower side surfaces.

In the embodiment described above, the movable case 2 has been described as a box-shaped case.
The shape is not limited to the shape shown in FIG. 4, but may be any structure as long as it is supported by a coil spring in the housing 1 and can be floatingly supported, and the sensor guide 17, the sensor mounting bracket 13 and the like can be mounted. is there.

According to the embodiment described above, the pipe 9 is always a set of the upper and lower fixed guide rollers 1 supported by the movable case 2.
The movable case 2 is held by the coil spring 8 in the vertical direction via the holding plate 5, the spacer 6 and the steel ball 7 with respect to the housing 1, and is elastically moved in the horizontal direction by the coil springs 3, 4. Supported, and
The tip of the sensor 15 inserted into the sensor mounting bracket 13 attached to the sensor guide 17 via the coil spring 19 always moves following the deformation of the tube 9 even if the tube 9 is curved or deformed. Since it moves together with the tube 2, it comes into contact with the tube 9, so that the thickness of the coating on the tube 9 can be measured stably and reliably, the measuring operation becomes easy, and the measuring time can be greatly reduced.

[0018]

As specifically described above, according to the coating thickness measuring apparatus of the present invention, the pipe for measuring the thickness of the coating on the surface is composed of the fixed guide rollers provided above and below the movable case. The movable case is always held by the movable guide roller, and the movable case is floatingly supported by the coil spring on the upper, lower, and four sides with respect to the housing, and the sensor for measurement can move in the axial direction together with the sensor mounting bracket and the sensor guide connected to it Therefore, even if the tube has a curve, the movable case can follow and move, so the sensor provided on the movable case is always in contact with the tube, and the thickness measurement of the coating can be performed stably and reliably. . In addition, the measuring operation can be easily performed without depending on the shape of the tube, and the measuring time is shortened.

[Brief description of the drawings]

FIG. 1 is a sectional view of a film thickness measuring apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line PP of FIG. 1;

FIG. 3 is a sectional view taken along line QQ of FIG. 1;

FIG. 4 is a sectional view taken along line RR of FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 housing 2 movable case 3 coil spring 4 coil spring 5 holding plate 6 spacer 7 steel ball 8 coil spring 9 tube 11 fixed guide roller 12 movable guide roller 13 sensor mounting bracket 14 slide bush 15 sensor 17 sensor guide 18 spring support rod 19 coil Spring 24 movable shaft

Continuation of front page (56) References JP-A-63-8511 (JP, A) JP-A-3-84693 (JP, A) JP-A-4-65621 (JP, A) JP-A-59-57109 (JP) JP-A-52-87092 (JP, A) JP-A-4-96004 (JP, U) JP-A-61-1490 (JP, Y1) (58) Fields investigated (Int. Cl. ⁶ , DB G01B 21/00 G01B 21/08

Claims (1)

(57) [Scope of request for utility model registration] 1. A box-shaped movable case provided inside a housing for vertically penetrating a metal tube to inspect a film such as an oxide film on the surface of the metal tube, and having an open portion on one side surface; A side surface coil spring that supports each side surface of the movable case into the housing, and a vertical coil spring that supports the upper surface and the lower surface of the movable case into the housing via a holding plate, a spacer, and a steel ball, A set of fixed and movable guide rollers respectively disposed above and below the movable case for supporting the metal tube with the metal tube interposed therebetween; and pulling the upper and lower movable guide rollers toward the fixed guide roller side to form the metal tube. Between the tension coil spring for sandwiching and the upper and lower guide rollers via a slide bush at an open portion of the movable case, and contacting a film thickness measuring sensor with the surface of the metal tube. Mounting bracket, a spring support bar fixed to the movable case, and one end connected to and holding the sensor mounting bracket, and the other end connected to the spring support bar via a coil spring. And a stopper for preventing rotation of the sensor guide provided at an opening of the side surface of the movable case.