JP3017934B2 - Long cylindrical body bending 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 bending of a long cylinder such as a nuclear fuel rod.

[0002]

Conventionally, a long cylinder, particularly a cylinder such as a nuclear fuel rod as shown in FIG. 3, tends to be bent. 3 is a cladding tube, 52 is a fuel pellet, 53 is a lower end plug, 54 is an upper end plug, the diameter is 12.27 mm, and the total length is 4065.
9 ± 0.8mm, very easy to bend. Therefore, the bending measurement is required. Conventionally, for such a long cylindrical object, a person contacts a measuring ruler to the long cylindrical object, finds a place where the gap between the long cylindrical object and the measuring ruler is the largest, and determines a distance of the gap by a gap gauge. Was used to measure bending, but this was primitive and inefficient.

[0003] The present invention has been made in view of such problems, and an object of the present invention is to provide an apparatus for measuring the bending of a long columnar object that enables high-speed measurement and automation.

[0004]

According to the bending measuring apparatus of the present invention, a long cylinder as a nuclear fuel rod is mounted so as to be movable in a direction perpendicular to the axis of the long cylinder. A surface plate having an upward slope in the moving direction of the long columnar body, a pusher having a roller at a tip thereof for rotating and advancing the long columnar body mounted on the surface plate, and above the surface plate. And a contact plate which is urged toward the surface plate and is moved in a direction away from the surface plate against a biasing force by contact with a long cylindrical body moving on the surface plate. A plurality of measuring jigs arranged in the width direction of the surface plate,
A micrometer for detecting the amount of movement of the contact plate as the amount of bending of the long cylindrical body.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a generalized apparatus for measuring the bending of a long cylindrical body according to the present invention. In this figure, a long columnar object 1 made of, for example, a nuclear fuel rod is rotated in the direction of arrow A on the surface plate 2 at the time of its bending measurement, thereby being moved (forward) in the direction of arrow B.

[0006] The measuring unit 3 is located ahead of the long cylindrical body 1.
Is arranged. The measuring unit 3 includes a measuring jig 4 and a micrometer 5, and the measuring jig 4 has a flat plate portion 6 as a contact plate and a shaft portion 7. The flat plate portions 6 are arranged in parallel with the surface plate 2 at intervals on the surface plate 2. The shaft portion 7 connects the flat plate portion 6 to the micrometer 5, whereby the flat plate portion 6 is supported by being protruded and biased against the surface of the surface plate 2.

In the measurement unit configured as described above, when measuring the bending of the long cylindrical body 1, the long cylindrical body 1 is moved in the direction of the arrow B by rotating the long cylindrical body 1 in the direction of the arrow A around the axis. The flat plate part 6 is sunk. At this time, if the long cylindrical object 1 has a bend, the flat cylindrical portion 1 is pushed up by the long cylindrical object 1 to be in a state shown by a two-dot chain line. The micrometer 5 detects the amount of movement of the flat plate portion 6 at this time as the amount of bending of the long cylindrical body 1.

Accordingly, if the long cylindrical body 1 is rotated one turn or more below the flat plate portion 6, the bending of the long cylindrical body 1 can be measured, and the conventional complicated work is not required, and high-speed measurement can be performed. Become. For the same reason, high speed and even automation are possible.

By the way, as shown in FIG. 2, the surface plate 2 is inclined upward in the direction perpendicular to the axis of the long columnar body and in the traveling direction of the long columnar body. Reference numeral 11 denotes a horizontal line, and θ denotes an inclination angle with respect to the horizontal line 11. Eight measurement units 3 are provided above the surface plate 2 at right and left intervals, and according to the inclination of the surface plate 2, the entire unit is tilted so that the flat plate portions 6 become parallel to the surface plate 2. Has been held.

The long cylindrical body 1 is rolled forward by a pusher 8. Six pushers 8 are provided at intervals in the lateral direction of the surface plate 2, and all the pushers 8 are simultaneously driven. The pusher 8 is composed of a shaft 9 and a roller 10 supported at the tip thereof. The pusher 8 rotates the long columnar body 1 in the direction of arrow A while rotating the roller 10 in the direction of arrow C. , By pressing in the direction of arrow B to convey toward the measuring unit 3.

As described above, since the surface plate 2 has an ascending slope and pushes the long cylindrical body 1 by the pusher 8, the moving speed of the long cylindrical body 1 can be kept constant. Thereby, damage to the long cylindrical body 1 can be reduced. That is, if the platen 2 has no inclination, the long cylindrical body 1 separates from the pusher 8 due to its inertia force, and is again pierced by the pusher 8 to be damaged. On the other hand, in the present invention, the long cylindrical body 1 is prevented from being separated from the pusher 8 by its inertia force, and the damage to the long cylindrical body 1 can be reduced.

Further, since a plurality of measuring units 3 are provided, it is possible to partially measure the bent portion of the long cylindrical body 1 and accurately measure the maximum bending amount. it can.

[0013]

As described above, according to the present invention, the bending measurement of the long cylindrical body can be performed by rotating the long cylindrical body at least one rotation around the axis below the contact plate. This eliminates the need for complicated operations, enables high-speed measurement, and helps automation. Moreover, since the platen has a slope and pushes up the long cylindrical body with a pusher,
The moving speed of the long cylinder can be kept constant determined by the moving speed of the pusher, preventing the long cylinder from separating from the pusher due to its inertia force and then contacting the long cylinder again. Thus, damage to the long cylindrical body can be reduced. In addition, since a plurality of measurement units are provided, it is possible to partially measure the bent portion of the long cylindrical body, and to accurately obtain the maximum value of the amount of bending.

[Brief description of the drawings]

FIG. 1 is a front view showing a basic structure of a long cylindrical body bending measuring apparatus according to the present invention.

FIG. 2 is a plan view (A) and a front view (B) showing a bending measurement unit for a long cylindrical body according to the present invention.

FIG. 3 is a side view showing a structure of a nuclear fuel rod which is an example of a measurement object of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Long cylindrical body 2 Surface plate 3 Measurement unit 4 Measurement jig 5 Micrometer 6 Flat plate part (contact plate) 7 Shaft part 8 Pusher 9 Shaft 10 Roller 11 Horizontal line 51 Cladding pipe 52 Fuel pellet 53 Lower end plug 54 Upper end plug

Claims (1)

(57) [Claims] An elongated cylinder as a nuclear fuel rod is mounted so as to be movable in a direction perpendicular to the axis of the elongated cylinder, and the ascending and descending slope is set in the moving direction of the elongated cylinder. A platen attached, a pusher having a roller at the tip for rotating and advancing a long cylindrical body placed on the platen, and disposed above the platen and protruding toward the platen. A plurality of contact plates that are urged and move in a direction away from the surface plate against a biasing force by contact with a long cylindrical body that moves on the surface plate, the plurality of contact plates being arranged in the width direction of the surface plate And a micrometer for detecting the amount of movement of the contact plate as the amount of bending of the long cylindrical body.