JP3088658B2 - Measuring device for protrusions on the inner peripheral surface of a cylindrical test object - 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 size of a projection on the inner peripheral surface of a cylindrical test object, and more particularly to a cylindrical test object such as a spacer used for determining the position of a fuel rod of a fuel assembly. Is held in contact with the horizontal reference plane of the horizontal reference base and the vertical reference plane of the vertical reference base, and the height of the protrusion on the inner peripheral surface of the cylindrical test object is measured with reference to the outer peripheral surface of the cylindrical test object. The present invention relates to an apparatus for measuring the size of protrusions on the inner peripheral surface of a cylindrical object to be inspected.

[0002]

2. Description of the Related Art Generally, the positioning of fuel rods in a fuel assembly is performed by the height of a projection formed on the inner peripheral surface of a cylindrical body constituting a spacer. Therefore, the height of the protrusion on the inner peripheral surface of the cylindrical body is always strictly measured.

[0003] By the way, a projector or an automatic inspection device is used for measuring a projection on the inner peripheral surface of a cylindrical body such as the spacer.

In the measurement using a projector, the maximum actual dimension of the outer peripheral surface and the top size of the projection on the inner peripheral surface are determined due to the inclination of the object to be inspected, sagging of a measuring portion generated during processing, errors between operators, and low repeatability. There is a problem that it is difficult to measure accurately.

[0005] Therefore, in such a projector, it has been desired to develop a measuring apparatus in which the object to be inspected is set upright and the maximum physical size of the outer peripheral surface is used as an accurate reference.

In the measurement by the automatic inspection apparatus, the object to be inspected is set as close to vertical as possible, the outer surface of the object to be inspected is fixed so as to be sandwiched from two directions, and the probe is brought into contact with the top of the protrusion on the inner peripheral surface. Although the measurement is performed, there is a problem that the measurement accuracy is lowered due to the inclination of the inspection object and the deviation of the reference of the outer peripheral surface.

[0007] Therefore, in such an automatic inspection apparatus, it has been desired to develop a measurement apparatus in which the fixing of the object to be inspected is accurately set at a point with respect to the outer peripheral surface of the object to be inspected.

Accordingly, in order to solve the above-mentioned problems, the present invention holds a cylindrical object such as a spacer in contact with a horizontal reference plane and a vertical reference plane, and measures the cylindrical object during measurement. The inner peripheral surface of the cylindrical object to be inspected is measured on the basis of the maximum actual dimension of the outer peripheral surface of the cylindrical object without being affected by the inclination and the variation in the dimensions of the cylindrical object. An object of the present invention is to obtain a projection dimension measuring device.

In the present invention, the contact element in contact with the inner peripheral projection of the cylindrical object to be inspected is formed into a cylindrical shape, and the contact with the inner peripheral projection is made point contact, thereby improving the contact accuracy and improving the inner peripheral area. The purpose of recording the maximum value obtained at the top of the protrusion is to provide a measuring device for measuring the protrusion of the inner peripheral surface of the cylindrical test object.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a horizontal reference base for holding an outer peripheral surface of a cylindrical test object having a projection on an inner peripheral surface in contact with a horizontal reference plane, and relates to this horizontal reference base. A vertical reference platform having a vertical reference surface in contact with the outer peripheral surface of the cylindrical test object; and the cylindrical test object contacting the horizontal reference surface of the horizontal reference platform and the vertical reference surface of the vertical reference platform. Rotating means for rotating the cylindrical object to be inspected, which is inserted into the cylinder of the cylindrical object to be inspected and which is rotated by the rotating means, and which moves up and down corresponding to the projection on the inner peripheral surface of the cylindrical object to be inspected; And a detector for detecting the vertical movement of the cylindrical tracing stylus.

Further, the present invention is characterized in that a record display for displaying a record detected by the detector is provided.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the accompanying drawings.

A measuring table 12 placed on a foundation 11 is provided in the apparatus 10 for measuring the projection of the inner peripheral surface of a cylindrical object to be inspected according to the present invention. A horizontal reference table 13 is mounted on the upper surface of the measurement table 12, and has a horizontal outer periphery of a cylindrical test object A having an inner peripheral surface protrusion AO such as a spacer used for determining the position of a fuel rod of a fuel assembly. The surface is regulated as a reference surface and held in contact.

On the upper surface of the measuring table 12, a horizontal reference table 13 is provided.
End vertical reference plane 14 and side vertical reference plane 1
The vertical reference base 16 having the reference numeral 5 is attached, and the vertical reference surface of the cylindrical inspection object A is regulated as a reference surface and is held in contact therewith.

The cylindrical test object A is adapted to be rotated about its central axis manually or by another appropriate driving method.

On the upper surface of the measuring table 12, a detecting device 18 having a cylindrical measuring element 17 parallel to the horizontal reference table 13 and the vertical reference table 16 is mounted. The detecting device 18 is provided with a vertical column 20 having a guide rail 19 extending in a vertical direction, and a detecting table 21 on which a cylindrical measuring element 17 is mounted moves up and down along the guide rail 19. .

This cylindrical measuring element 17 is usually used for the horizontal reference table 1.
3 on the horizontal reference so as to determine the origin position of the maximum outer peripheral surface of the cylindrical test object A. This cylindrical measuring element 17 is inserted into the cylindrical part of the cylindrical test object A,
Lightly contacts the inner peripheral surface of the cylindrical test object A. When the cylindrical probe 17 comes into point contact with the upper portion of the inner inner peripheral surface projection AO of the rotating cylindrical test object A, the height, that is, the dimension, is measured.

A measuring instrument 22 for measuring the vertical movement of the detection table 21 is mounted on the upper surface of the measurement table 12. The measuring device 22 is provided with a supporting column 23 and a supporting arm 24 extending upward, and a vertical motion detector 25 such as a magnescale for measuring the vertical motion of the detection table 21 and a recording display 26 are attached to the supporting arm 24. Have been.

The case where the height of the protrusion AO on the inner peripheral surface of the cylindrical test object A such as a spacer is measured using the measuring device 10 for measuring the inner peripheral surface protrusion of the cylindrical test object having such a configuration. explain.

First, the projection AO on the inner peripheral surface of the cylindrical test object A is displaced from the horizontal reference surface of the horizontal reference stand 13 so that the horizontal reference surface of the horizontal reference stand 13 and the side portions of the vertical reference stand 16 are perpendicular to each other. It is held in contact with the reference surface 15. Next, the cylindrical test object A is moved in the direction of the detector 18 along the horizontal reference surface of the horizontal reference table 13, and the cylindrical measuring element 17 is lightly applied to the peripheral surface of the cylindrical test object A in the cylinder. Insert while making contact.
Then, the tip of the cylindrical inspection object A is the end vertical reference plane 1.
When touching 4, the movement is stopped.

In this manner, the position of the cylindrical damage inspection object A is accurately held in contact with the horizontal reference stand 13 and the vertical reference stand 16 without shifting. In addition, this cylindrical probe 17
Is the thickness of the cylindrical inspection object A.

When the position of the cylindrical test object A is determined, the cylindrical test object A is rotated clockwise manually or by another method. When the cylindrical tracing stylus 17 hits the protrusion AO on the inner peripheral surface of the cylindrical test object A when the cylindrical test object A rotates, it moves up and down in accordance with its height. This cylindrical probe 1
7 along the guide rail 19 in accordance with the vertical movement of the
1 moves up and down, the up and down movement of the detection table 21 is detected by an up and down movement detector 25, and the detected value is displayed on a recording display 26.

If the cylindrical probe 17 comes to the highest point of the protrusion AO on the inner peripheral surface during the detection, the cylindrical contact 17 is lifted to the maximum height by the point contact. This height is detected by the vertical motion detector 25 and the detection signal is sent to the recording display 26. The record display 26 records and displays the maximum value by a peak hold function. Therefore, the height, that is, the dimension of the protrusion AO on the inner peripheral surface of the cylindrical test object A is accurately and quickly read.

If the height of the protrusion AO on the inner peripheral surface of the cylindrical inspection object A is a reference size, the read product is processed as a pass product.

The following results were obtained by comparing the measurement using the apparatus 10 for measuring the projections on the inner peripheral surface of the cylindrical object to be inspected with the measurement using a conventionally used projector.

The measuring time per unit is 2.9 minutes / unit in the case of the projector, but is 1.9 minutes / unit in the present measuring apparatus 10, and the number of measurements per day is in the case of the projector. Although the number was 42 / day, the measurement device 10 could increase the number to 46 / day.

For this reason, the number of processings per day is only 8.333 / day in the conventional projector, but in the present measuring apparatus 10, it can be increased to 9.166 / day to improve the efficiency of the measurement and inspection. did it.

In the case of a conventional projector, the measurement accuracy was only 0.229 mm.
Can be improved to 0.005 mm, and the repetition accuracy was 0.012 mm in the case of the projector, but could be improved to 0.005 mm in the present measuring apparatus 10 and the accuracy could be improved.

[0028]

According to the present invention, there is provided a horizontal reference base for holding an outer peripheral surface of a cylindrical inspection object having a projection on an inner peripheral surface thereof in contact with a horizontal reference surface, and the cylindrical reference base in relation to the horizontal reference base. A vertical reference base having a vertical reference surface in contact with the outer peripheral surface of the test object; and a rotation for rotating the cylindrical test object while abutting the horizontal reference surface of the horizontal reference base and the vertical reference surface of the vertical reference base. Means, a cylindrical tracing stylus which is inserted into the cylinder of the cylindrical object to be inspected rotated by the rotating means and moves up and down in accordance with contact with a projection on the inner peripheral surface of the cylindrical object to be inspected, And a detector for detecting the vertical movement of the cylindrical measuring element. Therefore, the cylindrical measuring element determines the inner peripheral surface of the cylindrical inspected object with respect to the outer peripheral surface of the cylindrical inspected object such as a spacer. Point contact with the protrusions to accurately and quickly measure the upper dimension of the inner protrusions It can be.

Further, since the detector of the present invention is a recording display, the highest value of the projection on the inner peripheral surface of the cylindrical test object can be recorded with a peak hold function and read accurately. .

[Brief description of the drawings]

FIG. 1 is a front view showing, in cross section, a part of an apparatus for measuring the size of a projection on an inner peripheral surface of a cylindrical inspection object of the present invention.

FIG. 2 is a side view in which a part of FIG. 1 is removed.

FIG. 3 is a plan view in which a part of FIG. 1 is removed;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Measuring device for protrusion of inner peripheral surface of cylindrical object to be inspected 11 Foundation 12 Measurement table 13 Horizontal reference table 14 End vertical reference plane 15 Side vertical reference plane 16 Vertical reference table 17 Cylindrical measuring element 18 Detector 19 Guide rail Reference Signs List 20 vertical column 21 detection table 22 measuring instrument 23 support column 24 support arm 25 vertical motion detector 26 record display

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-110201 (JP, A) JP-A-7-92287 (JP, A) JP-A-5-341085 (JP, A) JP-A-2- 198313 (JP, A) JP-A-63-177001 (JP, A) JP-A-60-27803 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G21C 17/06 G01B 5 / 12 G21C 3/34

Claims (2)

(57) [Claims] 1. A horizontal reference base for holding an outer peripheral surface of a cylindrical inspection object having a projection on an inner peripheral surface thereof in contact with a horizontal reference surface, and A vertical reference base having a vertical reference surface in contact with the outer peripheral surface, a rotating means for rotating the cylindrical test object while abutting on the horizontal reference surface of the horizontal reference base and the vertical reference surface of the vertical reference base, A cylindrical probe that is inserted into the cylinder of the cylindrical object to be rotated by the rotating means and moves up and down in accordance with the protrusion on the inner peripheral surface of the cylindrical object to be inspected; A detector for measuring the protrusion of the inner peripheral surface of a cylindrical test object, comprising: a detector for detecting vertical movement. 2. The apparatus according to claim 1, further comprising a record display for displaying a record detected by said detector.